Question about 1988 Chevrolet C1500

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My 1988 Chev pick-up truck (V6) wont idle. It starts great every time, but about 10 seconds after it has been started, the truck stalls. I have replaced the base gasket on the throttle body, cleaned the throttle body. Cleaned the EGR valve the best I could. Checked the timming and yet the problem still remains. What can I try next?

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  • fbasten_23 Jul 17, 2009

    Thanks, for your response drallim.

    I already replaced the fuel filter and cleaned out the sock on the fuel pump. I thought maybe if I drive the truck some error codes may show up, but the problem is so bad that when I let the clutch out it stalls, no matter how much gas I give it. The truck will lurch and kind of bunny hop. So far the only error code to come up was the Oxogen sensor. I then replaced it along with the cadillac converter. These changes made the truck sound better, but didn't fix the problem. When I replaced the base gasket on the throtle body it stopped the back firing, yet the truck still stalls. Next I was going to look at the MAP sensor or look for a vacuum leak. Any other sugestions would be greatly appriciated. Thanks

  • fbasten_23 Aug 17, 2009

    Thanks for everyones responses, about 2 weeks ago I replaced the fuel injectors and realized that it didn't change a thing. I then cut into the fuel line to test the pressure and found that I only had 3 psi ! So at this point I knew that it was the fuel pump. I replaced that and it was a night/day difference. The truck finally runs!!

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Try a new fuel filter. If that doesn't help, check the fuel pressure--may be a plugged intake sock filter inside the fuel tank.

Posted on Jul 16, 2009

  • drallim Jul 27, 2009

    You might try some injector cleaner in the fuel. Is the fuel in the tank relatively fresh? Check the exhaust system for being plugged--kinked pipe, plugged muffler (should sound throaty if good). Try opening the exhaust by disconnecting the outlet side of the converter. You could try blocking the EGR valve with a metal plate between it and the manifold. I've seen EGR valves that leaked vacuum from the exhaust side and pulled outside air through the stem seal. Check the throttle position sensor for intermittant output.

  • drallim Aug 17, 2009

    Observe the fuel injector spray pattern with the engine running (a flashlight helps). It should be fan shaped--if partial fan or misdirected to the side, remove the injector (watch how it comes out) and inspect the lower end for blocked screen. Remove the screen while noting it's orientation. Try blowing through the injector backwards with compressed air. Rent a fuel pressure tester and read the pressure on the fuel line at the injector (it needs a 't' fitting that connects between the fuel line and the throttle body). It should be about 8 or 9 PSI with the engine running. If very low, suspect the fuel pump for being worn out.

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