Home » Public Forums » GMCnet » New owner
| New owner [message #188995] |
Fri, 02 November 2012 14:14  |
Dave Mathis
Messages: 5
Registered: November 2012
Location: San Jose, CA
Karma: 0
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Junior Member |
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We been owners of our coach since February.
The few short trips we took were white knuckle the
whole way due to handling issues.
Finally after reading enough and JimK's advice,
I've got the steering to be at least gray knuckle.
The next big issue is the poor gas mileage at 7+ MPG.
No idea the history of the engine. It runs a cool
175-185deg (DigiPanel). The transmission with a Ragusa
pan also stays a cool 180. The fan seems to do the right
thing but engages often, a slight hill on the freeway
can bring up the roar. I have had one (possible) experience
with vapor lock, up hill, hot day, heavy slow traffic, nearly
full fuel tanks. The engine stumbled and picked up again
in a few seconds. There is an electric fuel pump installed, with
a check valve. I have no idea if it runs.
Cold start has a bit of engine noise that might me an
exhaust leak, or a stiff V belt, for all I know. I do know
the AC belt slips. Hot the noise is not noticeable.
Warm starts are very slow cranking, hot
starts are easier. Maybe a battery grounding issue.
With a test gauge, idle vacuum is 16". Seems low.
On a forced retirement budget, throwing money at the
problem is not an option.
Suggestions where to start to bring up the mileage?
Dave
AG6NV
1976 Birchaven 23'
San Jose, CA
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| Re: New owner [message #188999 is a reply to message #188996] |
Fri, 02 November 2012 15:19  |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Senior Member |
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Normal mileage seems to range between 8 - 10 miles per gallon. You might be a little low. I would check or replace the normal wear items. Air filter, plugs, check timing, check for intake leaks around carb, tire pressure, etc.
Stumble with vapor lock/fuel issue might be fuel filter item. Is the electric fuel pump running? Fuel line leaks?
Battery ground is easy to check - starting battery grounded to block. Clean terminals and coat with an anti-oxidant.
Engine fan clutch may be a little aggressive. There are several choices, search and read further on the GMCnet for both choice model numbers.
Good luck,
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: New owner [message #189006 is a reply to message #189003] |
Fri, 02 November 2012 16:28 |
stick miller
Messages: 1036
Registered: March 2010
Location: Americus, Georgia
Karma: 0
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Senior Member |
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I never got 7 mpg. Hope you have better luck. Don't mean to sound negative, but I really didn't. I ran non-ethanol gas, had fuel injection but best I could figure mine hovered around 5. Maybe I didn't drive it enough to give it a good chance. Maybe Ross can chime in here. He bought my coach.
Stick Miller
'78 Royale - "White Trash" - she left me for another man
'76 Eleganza - "Cousin Eddie" Sold
'84 Bluebird Wanderlodge - "Past Tents"
Americus, GA
[Updated on: Fri, 02 November 2012 16:42] Report message to a moderator |
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| Re: New owner [message #189008 is a reply to message #188995] |
Fri, 02 November 2012 16:45 |
RadioActiveGMC
Messages: 1020
Registered: November 2010
Location: Hot AZ desert
Karma: 0
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Senior Member |
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Gmc drivers after a few hundred miles have the worlds strongest handshakes!
***"Gettin There"-1973 23' Sequoia-
Michael, Onans smell, "Go solar/wind power!"
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| Re: New owner [message #189010 is a reply to message #188995] |
Fri, 02 November 2012 17:54 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
Karma: 0
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Senior Member |
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I think partially because our coaches have such flat, shallow, fuel tanks and less than ideal fuel venting systems, I find it hard to get a consistent mileage reading. They are all lower than I would like, but sometimes it's 6 and sometimes it's 9, and I think it has more to do with fuel fill than driving conditions. So, depending on how many tanks you have put in, it may be better than you think.
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: New owner [message #189012 is a reply to message #188995] |
Fri, 02 November 2012 18:08 |
Ross
Messages: 44
Registered: September 2011
Karma: 0
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Stick
On our trip to Amana, we averaged between 9-10 and that was over 1400 miles. Been very happy with the mileage and the coach in general.
Ross Hallman
78 Royale
Baden, On
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| Re: [GMCnet] New owner [message #189013 is a reply to message #188995] |
Fri, 02 November 2012 18:13 |
kelvin
Messages: 608
Registered: February 2004
Location: Eugene, OR
Karma: 0
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Senior Member |
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>The next big issue is the poor gas mileage at 7+ MPG. No idea the
history of the engine.
>It runs a cool 175-185deg (DigiPanel). The transmission with a Ragusa
pan also stays a cool 180.
There are those that will brag about 12-13mpg - like MY PO, for
instance. I saw between 5-6mpg when I first started driving this coach
in 2002.
A Paterson HEI distributor was the first thing I did - to replace a
Caddy HEI that the PO had installed with a choke cable next to the seat
to adjust mechanical advance on the fly. That was the biggest change in
MPG. A good solid 6.5 at that point.
Also removed the '76 Caddy carb and installed a bastardized Quadrajet
with GMC Q-jet parts inside. That helped a bit, too. Getting the
Initial Advance adjusted as high as I dare did some good, too. And
finally replacing the OEM exhaust with a true 2-12" system (the OEM
mufflers are NOT 2-1/2" inside) was the final bit.
From a 10,000# 23'er I get 8.5 if I'm towing and 9.5 if I'm not. This
is also assuming fairly long, flat driving. 7.5mpg isn't that far away
if I'm towing over the Oregon Coast on a 250 mile trip. I still think
there's another 1/2 to 1mpg to get with a true GMC Q-Jet but I'm good
for now.
So you're really not that far off of expected mileage. Probably just
tweaking things a bit or worse case, replacing things that aren't
correct, like the distributor or carb.
> Warm starts are very slow cranking, hot starts are easier. Maybe a
battery grounding issue.
Gene Fisher will have the answer for you on that one.
>On a forced retirement budget, throwing money at the problem is not an
option. Suggestions where to start to bring up the mileage?
Compared to owning a newer motorhome (with payments and inevitable
breakdowns) a GMC is pretty cheap, assuming you can work on it
yourself. That said, you can burn thru $500 pretty quickly on a single
project ($1500 on a big one is easy, too).
There's no way owning a motorhome makes sense economically At least
with this one there seems to be a certain amount of bliss associated
with that ownership. It's not just an RV... it's an obsession.
Just sayin'...
Kelvin
'73 23' in Eugene, OR
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| Re: New owner [message #189014 is a reply to message #189012] |
Fri, 02 November 2012 18:23 |
stick miller
Messages: 1036
Registered: March 2010
Location: Americus, Georgia
Karma: 0
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Senior Member |
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| Ross wrote on Fri, 02 November 2012 19:08 |
Stick
On our trip to Amana, we averaged between 9-10 and that was over 1400 miles. Been very happy with the mileage and the coach in general.
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Dang, Ross - I'm delighted. Are you talking Imperial gallons or US? That is amazing. I never was good at math. Glad you like the coach. Probably made a big mistake in selling...cause she who must be obeyed is not real keen on buying another.
Stick Miller
'78 Royale - "White Trash" - she left me for another man
'76 Eleganza - "Cousin Eddie" Sold
'84 Bluebird Wanderlodge - "Past Tents"
Americus, GA
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| Re: New owner [message #189016 is a reply to message #188995] |
Fri, 02 November 2012 19:44 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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Senior Member |
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No one brought up the generator. I know that the gas mileage suffers a LOT when I run the rooftop A/C (necessary in the Arizona summer) while driving. Figure at least one gallon per hour is feeding the generator running one A/C, and you can see that it would seriously reduce gas mileage. Figure I was driving a consistent 60mph, and getting a "base" 10mpg. Without the A/C that would be six gallons burned in an hour and 60 miles. But with the generator running it takes seven gallons to go that same 60 miles, so my mileage is down to around 8.5mpg. It gets worse when you're going slower (since the generator drinks the same amount hourly). My recent trip to Mexico required running the A/C for many hours, with a lot of stops and slow driving, so I didn't even try to calculate my gas mileage. You know the old adage - don't ask questions you don't want the answer to...
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: New owner [message #189018 is a reply to message #189002] |
Fri, 02 November 2012 20:32 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| ahamilto wrote on Fri, 02 November 2012 13:33 |
| davem wrote on Fri, 02 November 2012 14:14 |
...Suggestions where to start to bring up the mileage?...
|
Brake(s) dragging? Low tire pressure? Choke fully open when warmed up? Spark timing right? Distributor vacuum and mechanical advances working? Spark plugs clean and gapped correctly? Timing chain not stretched or worn? No vacuum leaks anywhere? Unobstructed fuel flow from tanks to carburetor? Fuel pump not degraded? Carburetor ports and jets clear? Front end aligned?
Others here should be able to come up with more things to check.
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Add bent boogies and worn pins.
Anything that causes the motor to run richer than needed or causes the coach to be harder to push down the road can cause higher than expected fuel usage. (low MPG)
Speed and driving habits can effect also.
I just do not check MPG.
Fill it up every 200 miles or so and do not stress out about it.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] New owner [message #189034 is a reply to message #188995] |
Sat, 03 November 2012 06:09 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Armand is the guy to listen to. A constantly cycling fan clutch can mean a
huge hit in mileage. It should not engage at temps below 205-210 deg. The
baffles are cheap and easy to make and install. GM added this fix in '77.
On Fri, Nov 2, 2012 at 12:14 PM, David Mathis <damaps@sbcglobal.net> wrote:
>
>
> We been owners of our coach since February.
> The few short trips we took were white knuckle the
> whole way due to handling issues.
> Finally after reading enough and JimK's advice,
> I've got the steering to be at least gray knuckle.
>
> The next big issue is the poor gas mileage at 7+ MPG.
> No idea the history of the engine. It runs a cool
> 175-185deg (DigiPanel). The transmission with a Ragusa
> pan also stays a cool 180. The fan seems to do the right
> thing but engages often, a slight hill on the freeway
> can bring up the roar. I have had one (possible) experience
> with vapor lock, up hill, hot day, heavy slow traffic, nearly
> full fuel tanks. The engine stumbled and picked up again
> in a few seconds. There is an electric fuel pump installed, with
> a check valve. I have no idea if it runs.
> Cold start has a bit of engine noise that might me an
> exhaust leak, or a stiff V belt, for all I know. I do know
> the AC belt slips. Hot the noise is not noticeable.
> Warm starts are very slow cranking, hot
> starts are easier. Maybe a battery grounding issue.
>
> With a test gauge, idle vacuum is 16". Seems low.
>
> On a forced retirement budget, throwing money at the
> problem is not an option.
> Suggestions where to start to bring up the mileage?
>
>
>
> --
> Dave
> AG6NV
> 1976 Birchaven 23'
> San Jose, CA
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Fathom the hypocrisy of a nation where every citizen must prove they have
health insurance......but not everyone has to prove they're a citizen.
Steve Ferguson
Sierra Vista, AZ
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| Re: New owner [message #189037 is a reply to message #188995] |
Sat, 03 November 2012 07:04 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| davem wrote on Fri, 02 November 2012 15:14 |
We been owners of our coach since February.
The few short trips we took were white knuckle the whole way due to handling issues. Finally after reading enough and JimK's advice, I've got the steering to be at least gray knuckle.
The next big issue is the poor gas mileage at 7+ MPG.
No idea the history of the engine. It runs a cool 175-185deg (DigiPanel). The transmission with a Ragusa pan also stays a cool 180. The fan seems to do the right thing but engages often, a slight hill on the freeway can bring up the roar. I have had one (possible) experience with vapor lock, up hill, hot day, heavy slow traffic, nearly full fuel tanks. The engine stumbled and picked up again in a few seconds. There is an electric fuel pump installed, with a check valve. I have no idea if it runs.
Cold start has a bit of engine noise that might me an exhaust leak, or a stiff V belt, for all I know. I do know the AC belt slips. Hot the noise is not noticeable.
Warm starts are very slow cranking, hot starts are easier. Maybe a battery grounding issue.
With a test gauge, idle vacuum is 16". Seems low.
On a forced retirement budget, throwing money at the problem is not an option.
Suggestions where to start to bring up the mileage?
|
Dave,
First and Foremostest - Welcome to the group/family/cult/asylum...
Yes, a 16" idle is a bit low, but there are many things that can cause that.
About the steering, many of these coaches suffer what years of disassembly and less then conscientious reassembly. With the advice of Dave Lenzi (he doesn't write here), I did four different operations, took about a day and an half to complete, and made my coach just a joy to drive. The steps are:
1 - Center the steering box. The instructions are in the manual, but you have to line up a flat on the shaft with the machined surface to get the box on the pre-loaded center. This is very critical.
2 - With the box now straight ahead, carry that up the column so the chisel mark on the top is at straight ahead. Put the wheel back on that way.
3 - From underneath, make sure that the relay lever and idler arm are both square to the front crossmember. This may require that you get an adjustable drag link if you do not have one.
4 - Do the remainder of the straight-ahead and toe adjustment with the tie rods only.
I can now let go of the wheel on the highway and the coach will stay in the lane.
If that doesn't do it, then go find Rob Muellers write-up on how to find loose front end parts. One loose tie rod end will cause real problems.
As to fuel mileage, 7+ is a little low, but how big is the +?? We have a light 23' and I don't count on better than 9. Our standard cruising speed is 60~65 and we live in flat country. Yes, we have done 10's and 12's, but I don't count on it.
What to look for?
Your fan should not ramp in at highway speed. I suspect that you have a wrong or a failing fan clutch. And yes, if it starts asking for power when you are at road speed, that will hurt the fuel rate. Mine was not disengaging when it should, so I sprayed the thermal spring with brake cleaner and then it started to behave correctly.
Have you checked the timing? And with that, have you opened up and the distributor and made sure that all the advance parts in there are in good shape? Does the cap have any tracks?
The best way to get good gas mileage is to do what most motorhome people seem to do.... Lie about it.
And finally, I have found that these coaches become much more a part of your life than just a thing you own. As I am a waterman, I compare it to the relationship that a waterman has with his boat. This caused me to think that I should welcome new owners that show up here a manner more fitting to the real situation. So,
May the Good Lord bless this coach and all those that set forth within her.
Welcome Dave
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: New owner [message #189048 is a reply to message #188995] |
Sat, 03 November 2012 09:48 |
1275gtsport
Messages: 272
Registered: September 2009
Location: Rothesay NB
Karma: 0
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Senior Member |
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one the trip home with Ours based on the amount of fuel we purchased and the distance travelled we were right at 10.7 mpg. no water in the fresh water tank unknown LPG and nothing in the holding tank (it had a hole). she was loaded with parts. including 2 new front seats, full sheet of plywood and 5 boxes of new flooring (40lbs each) and just 2 people in front.
I would guess she was close to her loaded camping weight because all the cabinets were full of something (I have old issues of gmcmi from the 1990)
I did not change to oil I never even checked to make sure there was water in the rad. I did my best to keep her around 60mph but the longer we drove the faster she wanted to go. by the end of the 600 mile trip it was hard to keep her under 70mph.
that was the best mileage I have ever gotten I believe before changing to the headers late last summer I was down to about 3.5 mpg due to cracked and leaking manifolds. the headers have brought me back to around 7 or so. I stopped checking and just dump fuel into the tank when needed. Next year we will replace the filters and see if there is less stops at the gas station.
Adam Raeburn
Rothesay, NB
1976 Austin Mini
1977 GMC Palm Beach
---------------------------------------------------
Once you replace everything that is attached to something else. It will all be fixed.
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| Re: [GMCnet] New owner [message #189081 is a reply to message #189048] |
Sat, 03 November 2012 14:19 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Check your mechanical advance and see that it is operating freely
Try advancing the timing about 2degrees.
Be careful to avoid preignition.
Tire pressure 65-75psi.
Welcome.
On Sat, Nov 3, 2012 at 7:48 AM, 1275gtsport@gmail.com <1275gtsport@gmail.com
> wrote:
>
>
> one the trip home with Ours based on the amount of fuel we purchased and
> the distance travelled we were right at 10.7 mpg. no water in the fresh
> water tank unknown LPG and nothing in the holding tank (it had a hole). she
> was loaded with parts. including 2 new front seats, full sheet of plywood
> and 5 boxes of new flooring (40lbs each) and just 2 people in front.
> I would guess she was close to her loaded camping weight because all the
> cabinets were full of something (I have old issues of gmcmi from the 1990)
>
> I did not change to oil I never even checked to make sure there was water
> in the rad. I did my best to keep her around 60mph but the longer we drove
> the faster she wanted to go. by the end of the 600 mile trip it was hard to
> keep her under 70mph.
>
> that was the best mileage I have ever gotten I believe before changing to
> the headers late last summer I was down to about 3.5 mpg due to cracked and
> leaking manifolds. the headers have brought me back to around 7 or so. I
> stopped checking and just dump fuel into the tank when needed. Next year we
> will replace the filters and see if there is less stops at the gas station.
> --
> Adam Raeburn
> Rothesay, NB
> 1976 Austin Mini
> 1977 GMC Palm Beach
> ---------------------------------------------------
> Once you replace everything that is attached to something else. It will
> all be fixed.
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: New owner [message #189089 is a reply to message #188995] |
Sat, 03 November 2012 16:45 |
mschultz
Messages: 113
Registered: September 2010
Location: Maple City, MI
Karma: 0
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Senior Member |
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Welcome to the GMC community! This is my experience and some of my thoughts on MPG. First of all, I have to say that MPG matters. At todays prices and the use of fossil fuels relative to the planet, I do not understand how anyone can ignore the amount of fuel they consume. And it may be an indication of an upcoming problem and expense. All of the above suggestions are relavent. Also add to that the gasket under the carb may be leaking or like in my case, a cylinder may not be pulling it's share. A compression test is an easy test to make sure all cylinders have at least reasonable compression. My 403, 77 Palm Beach had a bent exhaust valve that had come in contact with a piston. I was getting a slight miss when in gear at idle and could not find the source until I did the compression test. Even with only 7 cylinders, pulling 4000 lbs of trailer and 100 degree heat this summer, I averaged 8.5 mph. My coach weights over 12000 lbs. and previously without towing saw over 11 mph on a 3000 mile trip. If you are only driving 1000 miles a year, you may be able to suck it up and ignore it, but if you are on a 10000 mile adventure the cost between 11 mph and 7 mph is a huge factor. Determining the health of your machine can save you money in the long run. A breakdown on the road can be very expensive compared to finding a problem at home and curing it before it costs you big time.
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| Re: [GMCnet] New owner [message #189092 is a reply to message #189037] |
Sat, 03 November 2012 17:38 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Dave,
I reckon you should follow Matt / Dave's instructions and when you're done follow the procedure below too. When you're done you will
KNOW the condition of every part in the steering system.
Here's a link to the Steering Check:
http://www.gmceast.com/technical/Mueller_Steering_Inspection_Guide.pdf
Regards,
Rob M.
USAussie - Downunder
-----Original Message-----
From: Matt Colie
Dave,
First and Foremostest - Welcome to the group/family/cult/asylum...
Yes, a 16" idle is a bit low, but there are many things that can cause that.
About the steering, many of these coaches suffer what years of disassembly and less then conscientious reassembly. With the advice
of Dave Lenzi (he doesn't write here), I did four different operations, took about a day and an half to complete, and made my coach
just a joy to drive. The steps are:
1 - Center the steering box. The instructions are in the manual, but you have to line up a flat on the shaft with the machined
surface to get the box on the pre-loaded center. This is very critical.
2 - With the box now straight ahead, carry that up the column so the chisel mark on the top is at straight ahead. Put the wheel
back on that way.
3 - From underneath, make sure that the relay lever and idler arm are both square to the front crossmember. This may require that
you get an adjustable drag link if you do not have one.
4 - Do the remainder of the straight-ahead and toe adjustment with the tie rods only.
I can now let go of the wheel on the highway and the coach will stay in the lane.
If that doesn't do it, then go find Rob Muellers write-up on how to find loose front end parts. One loose tie rod end will cause
real problems.
As to fuel mileage, 7+ is a little low, but how big is the +?? We have a light 23' and I don't count on better than 9. Our
standard cruising speed is 60~65 and we live in flat country. Yes, we have done 10's and 12's, but I don't count on it.
What to look for?
Your fan should not ramp in at highway speed. I suspect that you have a wrong or a failing fan clutch. And yes, if it starts
asking for power when you are at road speed, that will hurt the fuel rate. Mine was not disengaging when it should, so I sprayed
the thermal spring with brake cleaner and then it started to behave correctly.
Have you checked the timing? And with that, have you opened up and the distributor and made sure that all the advance parts in there
are in good shape? Does the cap have any tracks?
The best way to get good gas mileage is to do what most motorhome people seem to do.... Lie about it.
And finally, I have found that these coaches become much more a part of your life than just a thing you own. As I am a waterman, I
compare it to the relationship that a waterman has with his boat. This caused me to think that I should welcome new owners that
show up here a manner more fitting to the real situation. So,
May the Good Lord bless this coach and all those that set forth within her.
Welcome Dave
Matt
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GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] New owner [message #189097 is a reply to message #189089] |
Sat, 03 November 2012 18:29 |
mickeysss
Messages: 1476
Registered: January 2012
Karma: 0
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Senior Member |
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May i ask this question, when checking the milage i assume one fills the gas to the tip top and it is right at the opening of the fill spout
where you put the gas in. This means all the hoses, connections, and apparatus must not leak. I have filled mine and did not smell anything.
I find this rather risky to fill it this much just to get the milage. But there is no other way that i see. I did not find leaks in my gas line or see any,
I suppose if you do it once to see the milage then it is ok. I feel like it is risky to do it every time to the top. What is someone else's feeling about this.
please as a newbie myself. I am not sure how to handle this filling to the top till it runs out to get the milage. thank you in advance.
mickey
77 palm beach
anaheim ca.
On Nov 3, 2012, at 2:45 PM, Michael Schultz wrote:
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>
> Welcome to the GMC community! This is my experience and some of my thoughts on MPG. First of all, I have to say that MPG matters. At todays prices and the use of fossil fuels relative to the planet, I do not understand how anyone can ignore the amount of fuel they consume. And it may be an indication of an upcoming problem and expense. All of the above suggestions are relavent. Also add to that the gasket under the carb may be leaking or like in my case, a cylinder may not be pulling it's share. A compression test is an easy test to make sure all cylinders have at least reasonable compression. My 403, 77 Palm Beach had a bent exhaust valve that had come in contact with a piston. I was getting a slight miss when in gear at idle and could not find the source until I did the compression test. Even with only 7 cylinders, pulling 4000 lbs of trailer and 100 degree heat this summer, I averaged 8.5 mph. My coach weights over 12000 lbs. and previously without towing saw over 11 mph
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> n a 3000 mile trip. If you are only driving 1000 miles a year, you may be able to suck it up and ignore it, but if you are on a 10000 mile adventure the cost between 11 mph and 7 mph is a huge factor. Determining the health of your machine can save you money in the long run. A breakdown on the road can be very expensive compared to finding a problem at home and curing it before it costs you big time.
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