| GMC runs but does not go . . . . [message #244472] |
Thu, 20 March 2014 18:59  |
verg
Messages: 54
Registered: September 2006
Location: Gettysburg, PA
Karma: 0
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Dear Friends,
I have a '73 that I am helping to get going.
It has been sitting for a number of years. With some effort, it starts and runs roughly (bad gas?).
When putting the transmission in gear, there is a definite feeling of "something happened." A familiar "ok, its in gear" feeling.
Applying the gas, the coach seems to want to lurch forward, but goes no where. You can feel the power of the engine straining to move the coach.
I have been in cars with bad transmissions and clutches - it just doesn't feel like that. Those bad trans just seemed to spin or only allow the car to crawl when you put on the gas.
Applying too much gas results in the engine stalling, reminding one of stalling out a manual transmission car.
I thought maybe the rear brakes had seized. Today, I jacked the coach up and all four rear wheels could be turned manually.
What next?
Thank you for time and kind attention in reading and advising.
Regards,
John
John Novicki
near Gettysburg, Pa
Looking for Glenbrook Yellow Plaid Material
'75 Glenbrook 26' "Bumble"
'86 300SL
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| Re: GMC runs but does not go . . . . [message #244480 is a reply to message #244472] |
Thu, 20 March 2014 20:01  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Trans fluid may be low from sitting and convertor drain down. Start it with wood cover off and check the stick with it running in park filling with Dexron to the middle of the scribed area. When hot it will he full full.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: GMC runs but does not go . . . . [message #244481 is a reply to message #244472] |
Thu, 20 March 2014 20:01 |
Steve
Messages: 506
Registered: September 2013
Location: East Greenville, Pa
Karma: 1
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Better check the front wheels as well to see if they are free.
1978 GMC Royal
Eastern Pennslyvania
1968 Chevrolet C20 396 Camper Special
1969 Chevrolet C20 Camper Special
1985 Buick Electra Park Avenue
1992 Camaro 25th Anniversary Heretage Edition Black
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| Re: GMC runs but does not go . . . . [message #244482 is a reply to message #244472] |
Thu, 20 March 2014 20:04 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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I re read your post and misunderstood the symptom. However all fluids should be checked or changed to re awake her. Brake theory mentioned sounds correct
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: GMC runs but does not go . . . . [message #244496 is a reply to message #244472] |
Thu, 20 March 2014 22:09 |
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WildBill
Messages: 232
Registered: January 2014
Karma: 1
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Rears aren't seized because he checked, yeah jack up the front end and make sure they turn. If seized pull the wheels and use a long screwdriver between disk and calliper to compress piston back into calliper, crack bleeder if necessary. Once compressed a bit make sure outside pad is loose, smack it if necessary if pad stuck to rotor. Once that one is loose just give the calliper a smack the other direction and make sure that pad is lose.
bad gas, and I'm sure it is but would normally pop back through carb under load but check fuel filters, some could be hidden anywhere, along frame rail or just before fuel pump. If tank levels are low enough a couple bottles of like Sea Foam Gas treatment and a few jerry cans of fresh gas might do the trick. If tanks are pretty much full drain off as much say you can.
[Updated on: Thu, 20 March 2014 22:14] Report message to a moderator |
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| Re: GMC runs but does not go . . . . [message #244512 is a reply to message #244472] |
Fri, 21 March 2014 08:19 |
verg
Messages: 54
Registered: September 2006
Location: Gettysburg, PA
Karma: 0
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Thank you gentlemen,
I will jack up the front today.
I assume the procedure is
block rear wheels, put trans in neutral, jack up under front cross member with heavy duty floor jack, and then proceed with procedures in your text above?
Any caveats on jacking? (other than not getting underneath - I had a friend die that way)
Do I have to be worried about cracking the wind screens?
Thank you
John
John Novicki
near Gettysburg, Pa
Looking for Glenbrook Yellow Plaid Material
'75 Glenbrook 26' "Bumble"
'86 300SL
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| Re: GMC runs but does not go . . . . [message #244513 is a reply to message #244512] |
Fri, 21 March 2014 08:28 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Senior Member |
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I'd break lug nuts on front wheels before jacking up unless you have a really good air wrench and yes don't twist to much or you can crack windshields, take front wheels and slide under frames on each side and use some really good jackstands under each side of front crossmember and a jackstands under frame in front where the side frame and front clip bolt together. Just the procedure I use when I,m going to be under the beast. Take you time and be SAFE!
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: GMC runs but does not go . . . . [message #244517 is a reply to message #244472] |
Fri, 21 March 2014 08:43 |
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WildBill
Messages: 232
Registered: January 2014
Karma: 1
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Senior Member |
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You can jack under the lower control arm. One wheel on the ground and one off. We're just trying to see if they are free at this moment and get it to move. Neutral and grab the wheel and try to spin it. If wheel spins lift the other one and check, you can fire up the engine and chech but don't spin them up to fast, wheel will be going twice as fast as spedo says and hard on spider gears.
Note: slim chance it has posi traction in which you would have to jack both sides but if the calliper was free you would still be able to turn the wheel a certain amount, however if you tried it in gear it could move in gear with one wheel off and pull it off the jack.
[Updated on: Fri, 21 March 2014 08:53] Report message to a moderator |
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| Re: GMC runs but does not go . . . . [message #244523 is a reply to message #244517] |
Fri, 21 March 2014 10:03 |
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jaholland
Messages: 565
Registered: June 2010
Location: Sweet Home Alebamy
Karma: 0
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# 1 ~ Put In Neutral and Check Front Wheel Movement
# 2 ~ Change All Fuel Filters
# 3 ~ Put 10 Gallon Of Fresh Gas In Tanks
# 4 ~ Add 1 Can Of Stabil Or Seafoam To Tanks
# 5 ~ Change Oil Filter
# 6 ~ Check Oil Level And Add Necessary Oil
# 7 ~ Drop Tranny Pan And Change Tranny Filter
# 8 ~ Check Tranny Fluid Level And Add Necessary Fluid
# 9 ~ Start Engine
# 10 ~ Let It Warm Up To Normal Operating Temp
~ N E X T
A ~ Put Foot On Brake Petal
And Shift Transmission Slowly Thru All Gear Positions As Follows;
B ~> Park / Reverse / Neutral / Drive / Low ~
Then Shift Slowly Thru All Gear Positions As Follows;
# C ~> Low / Drive / Neutral / Reverse / Park ~
# D ~ Let Motor Idle With The Transmission In Park
For About 3 Minutes
Then
Repeat The A Thru D Process Three Times
This worked for me on one that had been sitting 9 years
( The Blocked Tranny Filter Had Never Been Changed )
~ Joe ~
/_]*[__][] *[__|] ~ * '73 TZE063V101887 "
"
O----------OO--]* ~ '78 TZE168V100234 "
"
" Joe & Lavelle " "
"
'sweet home alebamy'
[Updated on: Fri, 21 March 2014 17:26] Report message to a moderator |
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| Re: GMC runs but does not go . . . . [message #244531 is a reply to message #244472] |
Fri, 21 March 2014 10:28 |
Ultravan Owners
Messages: 443
Registered: March 2013
Karma: 0
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Senior Member |
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Hi John,
If someone is trying to save the coach or even just the power plant I would do the following:
Check all wheels to be sure they are not frozen. (In your case just the front wheels now as they are the only ones left for you to check.)
I would change all fluids and filters.
I would drain the old gas tank. (An electric pump comes in handy here.)
Even if you changed the ATF and filter and the trans does not work again - you or the buyer are only out that cost and you know where things stand in regards to the trans.
However, if you try to short cut things and you get it moving and the fluid is old/bad and the filter is partly blocked it can cause more damage to the transmission the longer you drive it that way. (IT's only my opinion - but I do not think it is worth trying to short cut things like this.)
Now with that being said - IF you Only have to get it up unto a trailer to transport it - then that is another story.
Good Luck, Tony
Tony (Ontario Canada)
Marie and I are blessed to have had a 2nd chance to buy our farm.
Still hoping and more importantly praying to be able to build a garage.
Our 1970 Ultravan #520 has an Olds Toronado 455 in back.
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| Re: [GMCnet] GMC runs but does not go . . . . [message #244536 is a reply to message #244512] |
Fri, 21 March 2014 11:10 |
Wayne Newland
Messages: 75
Registered: February 2004
Karma: 0
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John
If you jack up one side in the front, you MAY run the risk of cracking a
windshield. It is best to jack up in the center and put jack stands under
the frame at the joint.
Wayne Newland F9300 75 Palm Beach Sebastian, FL
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of John Novicki
Sent: Friday, March 21, 2014 9:19 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] GMC runs but does not go . . . .
Thank you gentlemen,
I will jack up the front today.
I assume the procedure is
block rear wheels, put trans in neutral, jack up under front cross member
with heavy duty floor jack, and then proceed with procedures in your text
above?
Any caveats on jacking? (other than not getting underneath - I had a friend
die that way)
Do I have to be worried about cracking the wind screens?
Thank you
John
--
John Novicki
near Gettysburg, Pa
'75 Glenbrook 26'
'73 ex-Glacier 26' soon going to the desert
'39/'46 Austin 8 Van needs new home
http://www.replications.com/austin8/Austin8Van_1of9.jpg
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| Re: [GMCnet] GMC runs but does not go . . . . [message #244548 is a reply to message #244547] |
Fri, 21 March 2014 14:49 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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If you jack under the lower ball joint (a-frame) and just lift it off of the ground an inch or two, (like changing a tire) you will be OK. If you jack under the frame on one side you are asking to break a windshield. Many people have done it and broken one.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] GMC runs but does not go . . . . [message #244554 is a reply to message #244531] |
Fri, 21 March 2014 17:03 |
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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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Tony,
The transmission fluid filter is a VERY coarse horse hair filter which will only filter out BIG lumps it is highly unlikely that it
would get plugged up.
However, as the French say; "rien impossible" (nothing's impossible) John could drop the pan, remove the filter and inspect it or
blow through it to make sure it's not plugged.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: Tony
Hi John,
If someone is trying to save the coach or even just the power plant I would do the following:
Check all wheels to be sure they are not frozen. (In your case just the front wheels now as they are the only ones left for you to
check.)
I would change all fluids and filters.
I would drain the old gas tank. (An electric pump comes in handy here.)
Even if you changed the ATF and filter and the trans does not work again - you or the buyer are only out that cost and you know
where things stand in regards to the trans.
However, if you try to short cut things and you get it moving and the fluid is old/bad and the filter is partly blocked it can cause
more damage to the transmission the longer you drive it that way. (IT's only my opinion - but I do not think it is worth trying to
short cut things like this.)
Now with that being said - IF you Only have to get it up unto a trailer to transport it - then that is another story.
Good Luck, Tony
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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] GMC runs but does not go . . . . [message #244556 is a reply to message #244512] |
Fri, 21 March 2014 17:06 |
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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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John,
Chock the rear wheels. Don't set the parking brake unless you know it will release.
Doesn't matter where you put the transmission the front wheels will be off the ground.
You will need a 2.5 - 3.0 ton floor jack.
Locate the floor jack's pad in the middle of the front cross member making sure that it extends a bit behind the cross member. I say
that because it is curved.
As long as you jack up the front end in the center of the front cross member you won't have to worry about cracking a windshield.
Jack the front end up slowly and have two jack stands that will hold three tons ready to place under the front crossmember or frame
when you get to the height you desire.
Set the jack stands to the correct height and lock them in position.
Slowly let the coach down onto the jack stands.
Pump the floor jack back up until it too is bearing a bit of weight.
Regards,
Rob M.
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
-----Original Message-----
From: John Novicki
Thank you gentlemen,
I will jack up the front today.
I assume the procedure is
block rear wheels, put trans in neutral, jack up under front cross member with heavy duty floor jack, and then proceed with
procedures in your text above?
Any caveats on jacking? (other than not getting underneath - I had a friend die that way)
Do I have to be worried about cracking the wind screens?
Thank you
John
_______________________________________________
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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