Question about 1988 GMC C1500
I have a problem with the engine sputtering when I drive the vehicle; spark plugs, distributor cap,and rodery button along with fuel filter has been replaced; fuel additive has even been added to the gas tank. No matter what I do, it only seems to do better for a day or two and then it goes back to doing the same thing. I feel the sputtering underneath the gas pedal if that helps solves the problem.
Posted by Anonymous on
You didn't mention anything about new plug wires. Might be an area to look into
Posted on Aug 03, 2017
You did not say what the mileage is. Judging from the age, I would say it is pretty high. The issue most likely related to timing. The shaft that turns the distributors rotor cap has bushings on it and it also is driven by gears inside the engine. They wear out and the timing becomes off. Also you can get a lot of wear on the timing chain and gears at that age.
Posted on Aug 03, 2017
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Posted on Jan 02, 2017
Check the fuel pump pressure. should be between 60 to 66 psi. There isn't an easy answer for this one. You may need to perform component testing and a diagnostic check.
Posted on Jun 09, 2009
SOURCE: 88 GMC C1500 idle problem
Unfortunately, the ECM isn't "OK"...Get a read on the computer and go from there...if I had to guess I'd say ALL the O2 sensors are fouled...especially if you use gas additives or starting fluid.
P.S. did she ever backfire on you?
Posted on Jun 14, 2009
Smell of the oil,to see if the fuel injector(spider)is leaking into the crank case,if so,the intake will have to be removed to repair the problem,oh,and change the oil.
Posted on Jul 11, 2010
I'm leaning toward timing 180 out too, but the easy way is to switch around plug wires on to of the cap. It's a faster way to determine if it it's the problem. Switch # 1 with 6, 7 with 4, 3 with 2 and 5 with 8. That will change where the spark goes to. Another Solution is to carefully rotate the cap with wires still attached. Either method will rotate during order 180 degrees without pulling the distributor. If it runs more like it should, then I would pull the distributor and rotate it. But rotating cap or switching the wires on the cap to the correct order will determine if that is ths case. I would like to know if I helped youso please let me know
Posted on Dec 16, 2012
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