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I have a 1989 Chevy c1500 that keeps stalling? Details below. Any advice for trouble shooting or what parts could be causing this??

Hello, I have a 1989 Chevy c1500 5.7l pickup truck and I have a problem with the truck stalling. Recently I was driving my truck when then accelerating on to the expressway, my truck stalled. Pulled over and put it in neutral and tried to restart it. The engine would just turn over. After several tries, I go home then come back a few hours later to see if it will start again. After a few more tries, it would just turn over and not start so I had it towed to my house. After waiting about a week and not touching my truck, I decide to go work on it and first I tried to start it once more and the darn thing starts right up. So I take it for a drive around the neighborhood but it drove extremely rough with hesitation. I go home and check the distributor and see that the cap and rotor are bad. I change that and it solved why the truck was running really rough. At the same time, I had my ignition control module checked at the auto store and it passed as working. Next day after changing the cap and rotor, I drive the truck around and it was driving strong. No hesitation what so ever. I even gassed it a few time to test it and thought I had the problem resolved. After driving around for 30 minutes or so for a few miles and the truck being well warmed up, I start to accelerate on to an expressway again and it stalls again! I pull over try to restart it and it only turns over but does not restart. With the car off and not starting, I take my air filter off and listen to the TBI and can hear gas squirting when pressing on the gas pedal. I could also smell the gas in the TBI so I figure it must not be a fuel problem, because it seems like fuel is getting to the engine, but likely an ignition problem. I then come back later that day to try and restart it but all it does is turn over and not restart. So I have it towed back home once again. At home I decide to change the fuel filter for the hell of it to see if that is the problem but it still did not start. I then use a spark tester and see that no spark was coming from spark plug wire when turning over the engine. I then test the wire leading from the ignition coil to the distributor and see no spark. Is it possible the ignition coil is failing? Any suggestions on what trouble shooting to do next or what parts could be responsible for this? Thanks

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  • Chevrolet Master
  • 450 Answers

Sounds like your fuel pump, is on its last leg. (in tank) dropping your tank is never fun so cut an access hole in your bed, above where your fuel pump is located, its an 1989, so what the hell. its so much easyier. make the opening 12''square. note: there is a ground strap, make sure its attached from pump to fill pipe. study locations of fuel hoses,etc., be careful when removing lock ring, and fuel pump , a repair manuel would be helpful. good luck

Posted on Jan 12, 2013

  • Rick Mullen Jan 13, 2013

    Yes that could be the problem but i find it odd how i see no spark coming from ignition and spark plug wires when turning over the engine. Cause with no spark, then the car wont start and that is why i kind of figured it might be ignition related. But since it id an old truck, it may be good to just replace the fuel pump anyway. Especially if i don't have to drop the tank and just cut a piece out from bed. It would make it much easier.

  • ken hane Jan 14, 2013

    YES, COILS DO GO BAD, replace it , thought you did !



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2 possible causes:
1. you have dirt in the tank that's clogging the sump when the fuel gets agitated - leaving the engine stopped allows the dirt to go back on the bottom, unclogging the sump of the pump. The tank will have to be taken off the car, emptied and washed thoroughly.
2 - the wires powering the fuel pump go loose when heated and cut off the power - this is easy to test : when this happens just unhook the fuel line from one of the injectors and put the contact(no engine starting), it the pump is still working the fuel should gush out. Clean the contact with wire wool and crimp them a little more.

Posted on Nov 04, 2010

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