88 gmc c2500 stalling problems - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mnGMChevy · 02-01-2015, 01:09 PM

Hi, I just joined this forum, i'm hoping to get some real answers instead of "google that ****"

here's my issue. my 88 has been sitting since november. it stalls, no pattern of stalling, nothing happens before it stalls, it just stops running. (ex. on the freeway, leaving my drive way, coming to a stop, leaving a stop, at any speed etc.), other times it wants to stall but keeps going, if that makes sense, but It always starts right up. since december i replaced battery cables, checked and repaired some bad wiring, changed the plugs and wires, rebuilt the top half of the TBI (an injector was tweeting, o-rings where shot) fuel filter is newish, fixed a bad leak at the oil filter adaptor got my oil pressure back up, just generally checked the obvious. i was thinking distributor and modules etc. or bad fuel pump?? after all ive done to it it runs really good now, but still stalls. at a loss now really, recent problem my starter solenoid fried, i have replaced three solenoids and 2 batteries since august, now im thinking if i find whats frying my starters and batteries i might fix my stalling problem?? thanks for any help!

mountie · 02-03-2015, 08:04 PM

Check ALL ground connections... ( top of intake, etc.)

Poor grounds will fool your computer, and do weird things due to unusual info from sensors, etc.

Clean your computer chip ' tangs'..... ( ground issue , again)

Doing this solved a few issues I had with idle & stalling.

ChevyTech · 02-04-2015, 12:01 PM

Hi fellow Minnesotan.

Welcome to the board!

If the truck has been sitting I am suspicious of the fuel being bad.

It seems like there are more problems with the hose in the fuel tank getting bad on trucks that sit a lot. If that hose leaks the fuel pressure will be low.

Here is thread where that was the problem.
http://67-72chevytrucks.com/vboard/s...d.php?t=375132

I agree with you that it could be a bad ignition module in the distributor.

Many auto parts stores in our area will test the distributor module for free if you bring it in.

The test results from these stores are not always accurate, and some times the will say the module is good when it is not, but for a free test that may find the problem it is worth a try.

Make sure when you install or reinstall the distributor module that you use heat sink compound under it. The compound helps dissipate heat from the module. Without it, the module will fail.

I would test the distributor module first and if it was OK I would test the fuel pressure with the engine running.

mnGMChevy · 02-04-2015, 11:02 PM

Thanks, i've driven it and put gas in it, so i'm near ruling out fuel problems, ground issues was my first thought after my recent problem, i picked up a new solenoid and new battery(still on warranty). with the ground issues and more wire checks looks like i got a nice project to look forward to. My distributor module has definitely seen better days, this guy i work with mentioned replacing the distributor and modules also. gonna give it a shot, Fingers crossed....

02-01-2015, 01:09 PM	#1
mnGMChevy Registered User Join Date: Jan 2015 Location: St. Paul mn Posts: 2	88 gmc c2500 stalling problems Hi, I just joined this forum, i'm hoping to get some real answers instead of "google that ****" here's my issue. my 88 has been sitting since november. it stalls, no pattern of stalling, nothing happens before it stalls, it just stops running. (ex. on the freeway, leaving my drive way, coming to a stop, leaving a stop, at any speed etc.), other times it wants to stall but keeps going, if that makes sense, but It always starts right up. since december i replaced battery cables, checked and repaired some bad wiring, changed the plugs and wires, rebuilt the top half of the TBI (an injector was tweeting, o-rings where shot) fuel filter is newish, fixed a bad leak at the oil filter adaptor got my oil pressure back up, just generally checked the obvious. i was thinking distributor and modules etc. or bad fuel pump?? after all ive done to it it runs really good now, but still stalls. at a loss now really, recent problem my starter solenoid fried, i have replaced three solenoids and 2 batteries since august, now im thinking if i find whats frying my starters and batteries i might fix my stalling problem?? thanks for any help!

02-03-2015, 08:04 PM	#2
mountie Registered User Join Date: Jun 2011 Location: Bradenton, Fla. Posts: 1,100	Re: 88 gmc c2500 stalling problems Check ALL ground connections... ( top of intake, etc.) Poor grounds will fool your computer, and do weird things due to unusual info from sensors, etc. Clean your computer chip ' tangs'..... ( ground issue , again) Doing this solved a few issues I had with idle & stalling. __________________ '70 GTO Midnight Blue '88 GMC Sierra SLE 392,000 miles-(2018) sold to Classic car shop in Germany. '93 Cadillac STS Black '93 Mercedes SL 500 Teal '86 Yamaha FZ750 - 15,000 RPM '86 Yamaha FJ1200 - Criminally Fast 2016 Ferrari 488 GTB, I drive it - don't own it. '05 GMC Yukon XL , SLT 4wd ( just purchased 2018)

02-04-2015, 12:01 PM	#3
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: 88 gmc c2500 stalling problems Hi fellow Minnesotan. Welcome to the board! If the truck has been sitting I am suspicious of the fuel being bad. It seems like there are more problems with the hose in the fuel tank getting bad on trucks that sit a lot. If that hose leaks the fuel pressure will be low. Here is thread where that was the problem. http://67-72chevytrucks.com/vboard/s...d.php?t=375132 I agree with you that it could be a bad ignition module in the distributor. Many auto parts stores in our area will test the distributor module for free if you bring it in. The test results from these stores are not always accurate, and some times the will say the module is good when it is not, but for a free test that may find the problem it is worth a try. Make sure when you install or reinstall the distributor module that you use heat sink compound under it. The compound helps dissipate heat from the module. Without it, the module will fail. I would test the distributor module first and if it was OK I would test the fuel pressure with the engine running. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too. Last edited by ChevyTech; 02-04-2015 at 12:10 PM. Reason: Change wording

02-04-2015, 11:02 PM	#4
mnGMChevy Registered User Join Date: Jan 2015 Location: St. Paul mn Posts: 2	Re: 88 gmc c2500 stalling problems Thanks, i've driven it and put gas in it, so i'm near ruling out fuel problems, ground issues was my first thought after my recent problem, i picked up a new solenoid and new battery(still on warranty). with the ground issues and more wire checks looks like i got a nice project to look forward to. My distributor module has definitely seen better days, this guy i work with mentioned replacing the distributor and modules also. gonna give it a shot, Fingers crossed....



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