| '73 Painted Desert stalls out at 40-50 mph [message #176384] |
Wed, 11 July 2012 22:26  |
werewilfs
Messages: 329
Registered: July 2012
Location: Rappahannock County, VA
Karma: 0
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We are the proud soon to be owners of a 73 Painted Desert. We are super excited to be part of the GMC family and these forums are actually one of the main reasons we decided to seriously look at the GMCs. (That, and come one... these things are awesome!)
Having a small issue right now with the engine consistently hesitates when it hits 40 MPH and won't go any faster. It's uncanny how consistent it happens right at that speed. The current owner is having his mechanic take a look at the issue and at first diagnosed it as bad fuel lines. (the pump and filter were replaced last year) Fuel lines were just replaced (in addition to a rogue Fuel Filter the current owner's Grandfather snuck in there) and this offered a small improvement but definitely isn't fixed yet.
It's back at the mechanic now and he said "the issue may lie in a mid-stream sending or metering unit" (not sure what that is)...
Appreciate any guidance you guys can offer a coupla newbies to the GMC world.
Thanks!
Jared & Stefanie
Jared & Stefanie Kohl
Rappahannock County, VA
1973 Painted Desert "Onslow"
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| Re: '73 Painted Desert stalls out at 40-50 mph [message #176400 is a reply to message #176384] |
Thu, 12 July 2012 01:34  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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The faster you go the more fuel you need. This sounds like fuel starvation. It could be fuel filters in the carb or in the tank. After that maybe a new mechanical fuel pump.
An added electric boost (Carter P4070) pump might help.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: '73 Painted Desert stalls out at 40-50 mph [message #176405 is a reply to message #176384] |
Thu, 12 July 2012 06:09 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Sounds like fuel but after reading the post a few weeks ago and putting extra ground on the distributor of my 74 and the difference it made in overall running, it's a cheap, easy attempt, it can only make it run better. I've had many engines that acted like fuel but ignition was cutting back at a certain point in a required voltage area. I just took a hose clamp and a 12ga wire with a large ring terminal and wrapped it around the skinny part of the distributor housing with the ring term between the clamp and housing, unbeleivable difference. Another possibilty if it is fuel, and all else is clean, if the tanks are full it could be a no vent situation to the tanks, loosen cap a little and see how it drives. Just a few thoughts outside of the box, where I live.
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: '73 Painted Desert stalls out at 40-50 mph [message #176406 is a reply to message #176384] |
Thu, 12 July 2012 06:18 |
g.winger
Messages: 792
Registered: February 2008
Location: Warrenton,Missouri
Karma: 0
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Not enough fuel. Had a 33' Southwind with a 454. 1984 model. Had two cartridge fuel filters in the glovebox when we purchased from the dealer. Thats a message!! First trip, panhandle of Florida it would barely do 45mph. Changed FF in back. No help. Changed FF in carb. Very pluged and bulging. Fixed. years later it would have very diffrent symptoms. Could get up to speed fine but at random times it would "shut off" and coast down to about 30-40 before restarting. Some times it would not restart at all. Changed both FF,,,no joy. Had to disconnect the fuel line at the rear FF and blow backawards into the tank. Seemed like rust was pluging at the first bend above the fuel tank bung. Tube got a little smaller because of the die. Removed tank,(85 gal. monster)and cleaned about 2 QUARTS of rust out. No socks. Made one out of #12 solid and window screening. No more trouble. The 2 diffrent symptoms was kinda weird!!,,,,,PL
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| Re: '73 Painted Desert stalls out at 40-50 mph [message #176407 is a reply to message #176384] |
Thu, 12 July 2012 06:20 |
g.winger
Messages: 792
Registered: February 2008
Location: Warrenton,Missouri
Karma: 0
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Also,,,,make sure the FF in carb is installed the correct direction. Never had this happen to me so I know not what the symptoms would be. Any one else???,,,,PL
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| Re: '73 Painted Desert stalls out at 40-50 mph [message #176408 is a reply to message #176384] |
Thu, 12 July 2012 06:25 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Sir: Welcome; I also had this issue when I first got mine. Ended up being stuff in the tanks stopping up the fuel pick up screens (socks). I would try blowing shop air back into the tanks to clear the socks or hopefully to blow them off. First remove the gas cap to releve the pressure. The fuel line is rubber from the tanks inside the drivers side frame rail and goes into the reserve switching valve. Blow shop air back thru the switching valve till you have good bubbling sound from the tank, then turn key on and switch the dash valve and blow back thru the other tank. I added a clear inline filter (carry extras) in front of the switching valve (single rubber hose) so I could check or replace as needed. I also have a quick disconnect on my air tank and carry a hose and blower in case I need it on the road.
| werewilfs wrote on Wed, 11 July 2012 23:26 |
We are the proud soon to be owners of a 73 Painted Desert. We are super excited to be part of the GMC family and these forums are actually one of the main reasons we decided to seriously look at the GMCs. (That, and come one... these things are awesome!)
Having a small issue right now with the engine consistently hesitates when it hits 40 MPH and won't go any faster. It's uncanny how consistent it happens right at that speed. The current owner is having his mechanic take a look at the issue and at first diagnosed it as bad fuel lines. (the pump and filter were replaced last year) Fuel lines were just replaced (in addition to a rogue Fuel Filter the current owner's Grandfather snuck in there) and this offered a small improvement but definitely isn't fixed yet.
It's back at the mechanic now and he said "the issue may lie in a mid-stream sending or metering unit" (not sure what that is)...
Appreciate any guidance you guys can offer a coupla newbies to the GMC world.
Thanks!
Jared & Stefanie
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] '73 Painted Desert stalls out at 40-50 mph [message #176412 is a reply to message #176384] |
Thu, 12 July 2012 07:05 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Check to see if the carb is bolted tight. When I removed my carb to send it to Paterson I found out that the bolts were barely finger tight. But ONL y tighten to 8 - 10 ft lbs or you can warp the carb.
Sent via BlackBerry by AT&T
-----Original Message-----
From: Jared & Stefanie Kohl <vacougfan@yahoo.com>
Sender: gmclist-bounces@temp.gmcnet.org
Date: Wed, 11 Jul 2012 22:26:27
To: <gmclist@temp.gmcnet.org>
Reply-To: gmclist@temp.gmcnet.org
Subject: [GMCnet] '73 Painted Desert stalls out at 40-50 mph
We are the proud soon to be owners of a 73 Painted Desert. We are super excited to be part of the GMC family and these forums are actually one of the main reasons we decided to seriously look at the GMCs. (That, and come one... these things are awesome!)
Having a small issue right now with the engine consistently hesitates when it hits 40 MPH and won't go any faster. It's uncanny how consistent it happens right at that speed. The current owner is having his mechanic take a look at the issue and at first diagnosed it as bad fuel lines. (the pump and filter were replaced last year) Fuel lines were just replaced (in addition to a rogue Fuel Filter the current owner's Grandfather snuck in there) and this offered a small improvement but definitely isn't fixed yet.
It's back at the mechanic now and he said "the issue may lie in a mid-stream sending or metering unit" (not sure what that is)...
Appreciate any guidance you guys can offer a coupla newbies to the GMC world.
Thanks!
Jared & Stefanie
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Unsubscribe or Change List Options:
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] '73 Painted Desert stalls out at 40-50 mph [message #176417 is a reply to message #176412] |
Thu, 12 July 2012 07:54 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Vacuum issues can cause things like this and they would be pretty predicible. Yes, chk the carb bolts, that's a good one. What is the vacuum at idle, in park with the AC off? You should have somewhere @ 18". if you are at 10 or even 12", you may have an internal vacuum leak if the carb is tight. Also, a big brake booster leak may cause low vacuum-- if you do have low vacuum. A cracked intake could cause something like you report. Just keep your blinders off, look at fuel, fire, vacuum and mechanical issues. You know because these war horses have age and you have no idea of the maintenance of the beast, it would not hurt to just replace it all-- all new ignition parts, have the carb worked over, fuel system stem to stern-- it probably needs it. Look at it this way-- the wheels may pop off and you could shoot flames from the holding tank but at least the motor could run good!
Good luck, let me knoe if I can help,
Jim Bounds
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________________________________
From: Ray Erspamer <78gmc-royale@att.net>
To: Net GMC <gmclist@temp.gmcnet.org>
Sent: Thursday, July 12, 2012 8:05 AM
Subject: Re: [GMCnet] '73 Painted Desert stalls out at 40-50 mph
Check to see if the carb is bolted tight. When I removed my carb to send it to Paterson I found out that the bolts were barely finger tight. But ONL y tighten to 8 - 10 ft lbs or you can warp the carb.
Sent via BlackBerry by AT&T
-----Original Message-----
From: Jared & Stefanie Kohl <vacougfan@yahoo.com>
Sender: gmclist-bounces@temp.gmcnet.org
Date: Wed, 11 Jul 2012 22:26:27
To: <gmclist@temp.gmcnet.org>
Reply-To: gmclist@temp.gmcnet.org
Subject: [GMCnet] '73 Painted Desert stalls out at 40-50 mph
We are the proud soon to be owners of a 73 Painted Desert. We are super excited to be part of the GMC family and these forums are actually one of the main reasons we decided to seriously look at the GMCs. (That, and come one... these things are awesome!)
Having a small issue right now with the engine consistently hesitates when it hits 40 MPH and won't go any faster. It's uncanny how consistent it happens right at that speed. The current owner is having his mechanic take a look at the issue and at first diagnosed it as bad fuel lines. (the pump and filter were replaced last year) Fuel lines were just replaced (in addition to a rogue Fuel Filter the current owner's Grandfather snuck in there) and this offered a small improvement but definitely isn't fixed yet.
It's back at the mechanic now and he said "the issue may lie in a mid-stream sending or metering unit" (not sure what that is)...
Appreciate any guidance you guys can offer a coupla newbies to the GMC world.
Thanks!
Jared & Stefanie
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http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: '73 Painted Desert stalls out at 40-50 mph [message #176419 is a reply to message #176384] |
Thu, 12 July 2012 08:27 |
werewilfs
Messages: 329
Registered: July 2012
Location: Rappahannock County, VA
Karma: 0
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Senior Member |
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Wow... Thanks for the responses. This should give us a lot of places to look.
We are located in beautiful Rappahannock County in VA (bordering Shenandoah NP). We are new to both the GMC world and the world of RVs period. After looking at all the garbage that has been put out in the last number of years by RV manufacturers we just fell in love with the body style of the GMC RV and knew we had to get one. (Just hope we're not getting in over our heads)
Any recs on repair shops in VA that specialize in older motorhomes for an expert eye to give it a once over?
Jared & Stefanie Kohl
Rappahannock County, VA
1973 Painted Desert "Onslow"
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| Re: '73 Painted Desert stalls out at 40-50 mph [message #176420 is a reply to message #176419] |
Thu, 12 July 2012 08:30 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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How close are you to Leigh Harrison?
http://idencorpgmc.com/
Dennis
| werewilfs wrote on Thu, 12 July 2012 08:27 |
Wow... Thanks for the responses. This should give us a lot of places to look.
We are located in beautiful Rappahannock County in VA (bordering Shenandoah NP). We are new to both the GMC world and the world of RVs period. After looking at all the garbage that has been put out in the last number of years by RV manufacturers we just fell in love with the body style of the GMC RV and knew we had to get one. (Just hope we're not getting in over our heads)
Any recs on repair shops in VA that specialize in older motorhomes for an expert eye to give it a once over?
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: '73 Painted Desert stalls out at 40-50 mph [message #176426 is a reply to message #176419] |
Thu, 12 July 2012 08:56 |
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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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| werewilfs wrote on Thu, 12 July 2012 09:27 |
Wow... Thanks for the responses. This should give us a lot of places to look.
We are located in beautiful Rappahannock County in VA (bordering Shenandoah NP). We are new to both the GMC world and the world of RVs period. After looking at all the garbage that has been put out in the last number of years by RV manufacturers we just fell in love with the body style of the GMC RV and knew we had to get one. (Just hope we're not getting in over our heads)
Any recs on repair shops in VA that specialize in older motorhomes for an expert eye to give it a once over?
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Jared & Stefanie,
Welcome to the group/family/cult/asylum....
There are owners/members that regularly put tens of thousands of miles per year on GMC coaches. Those people are diligent about maintenance. I suggest you become so if you are not already.
Do you have the service books? If no, go look around Bdub's and down load all of them and carry them with you (on a CD).
You have lots of good places to start with your current problem, so I will not muddy that water. I am confident that it can be cured. These machines are every bit awesome (in the true sense), but they are basically simple - a whole lot of simple, but simple none the less. Even if you are not a world class wrench, there is a lot you can and should do to keep the coach reliable.
If you have been reading this group long, you know already that I tend to think of these coaches as more like boats than road vehicles, and being a waterman, I like to welcome new owners in the manner appropriate to the situation. So, to paraphrase a waterman's greeting to a new owner,
May the Good Lord bless this coach and all those that set forth within her.
Welcome Jared & Stefanie
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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