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OT. GMC pickup

D

dan mcdonald

Member
I have 1995 with 350 engine. When truck is cold runs great when it gets to operating temp I have to push on the accelerator slowly almost feather it. At stop sighs it sometimes dies. I have replaced the plugs and fuel filter. What next? THANKS
 

Disconnect vacuum hose at the egr valve to see if the hesitation goes away... If its a fix its a bad egr valve... replace it... If not its time to dig deeper...

I am starting to get a run on deformed/split/decomposed fuel hose in the tank that connects the pump to the pick up... It would be EZ to say they live their life span but on one I had replaced the pump a year ago... A fuel additive got it no doubt in my mine... I don't want to mislead you on the hose deal cuzz I would think it would affect it more cold than hot....

If th egr trick does not help I would want to know the timing was dead on and fuel spec's were dead on B-4 I went chasing my tail...
 
EGR valve could already be hanging open a little due to carbon and causing a lean burn at idle...pull the valve off and put some liquid like lite oil or carb cleaner in the pintle port...if it leaks thru,you may be able to tap pintle with a drift and hammer to knock carbon loose...just tap it...dont wail on it.
 
Had two or three come in the shop like that one. check other peoples replies first. last check the distributor. the magnets on the distributor shaft get week and the pickup cant get rpm to keep the motor running. feathering the throttle keeps the rpms up enough for it to keep going. Good luck.
 
I have an '89 GMC with the 350 that did the same thing. I was able to buy it cheap because of the problem, and mechanics couldn't figure it out. It wouldn't even idle, but stall, but ran like a top on the open road. I had to keep my foot on the gas. Pulled out the distributor and popped a rebuilt one in and the problem was gone. A mechanic told me that these 350 distributors only last so long.
 
I agree with Ron. The temp gauge in the dash of my 94 screwed up, so I just plumbed in a mechanical gauge from the same point as the coolant temp sensor. All of a sudden the same problem as you're having shows up. Still haven't had the chance to get the dash fixed yet, but I'm positive that putting the OEM temp system back together will fix it. The joys of owning computerized equipment!
 
(quoted from post at 15:50:42 04/08/11) I agree with Ron. The temp gauge in the dash of my 94 screwed up, so I just plumbed in a mechanical gauge from the same point as the coolant temp sensor. All of a sudden the same problem as you're having shows up. Still haven't had the chance to get the dash fixed yet, but I'm positive that putting the OEM temp system back together will fix it. The joys of owning computerized equipment!
Click to expand...

The gauge temp sender has nuttin to do with engine performance...
 
(quoted from post at 10:55:02 04/08/11)
(quoted from post at 15:50:42 04/08/11) I agree with Ron. The temp gauge in the dash of my 94 screwed up, so I just plumbed in a mechanical gauge from the same point as the coolant temp sensor. All of a sudden the same problem as you're having shows up. Still haven't had the chance to get the dash fixed yet, but I'm positive that putting the OEM temp system back together will fix it. The joys of owning computerized equipment!
Click to expand...

The gauge temp sender has nuttin to do with engine performance...
Click to expand...

To be even more clear.... there are TWO temp senders... one for the 'puter and one for the gauge.

The computer is not aware of what the sender for the GAUGE is saying.
 
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