Question about Chevrolet Chevette

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86 corvette. Location Elk Grove, CA. Car has 200k miles, no records from original owner. Replaced plugs and plug leads 2 weeks ago. Car ran like a top. Last week car started to miss while driving in residential neighborhood, then completely stalled out. After 1/2 hr. car started and drove for 1 block, then stalled out again. Left overnight, car then started right up. At idle and higher rpm in park, ran fine for about 4 minutes, coughed, not backfire, a couple of times then died. Engine would only crank. Replaced fuel filter, same problem. Replaced fuel pump with OEM pump, same problem. Outside temp 70-90 degrees. Engine oil temp & pressure and coolant temp on car normal. Sounds like fuel problem to me, but don't know where to go from here!! Can't drive to shop for repairs. Any suggestions?

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  • smugden Jul 26, 2009

    Thank you for your response. Suppose only way I know how to check ignition is pulling off plug lead and seeing if I get spark. Not sure easiest way to double check if it is still fuel problem. Don't have pressure gauge I can screw into the valve on the fuel rail. I did not check either ignition or fuel when this problem comes up.

  • smugden Jul 26, 2009

    Ok..thanks for the info. I'll look at my manual about throttle body, as I thought this was only on engines with carburator. What to look for if WD-40 fires up engine for a few seconds, then dies again? Appreciate your advise. Will let you know what happens today!!!

  • smugden Jul 26, 2009

    Looks like it is ignition, not fuel. checked spark, and when started okay. Then engine died, and cranked again...no spark

  • smugden Jul 26, 2009

    Don't know if you saw my last reply. Pulled one lead, checked spark, okay. Engine started then died. Cranked again, no spark, so guess it is not fuel issue. Have not changed coil, rotor, cap, and can do so, but maybe not necessary, as may be realy or something else....Any suggestions?

    Thanks again

    Mark

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Most likely problem considering all you've changed is the computer. It would make sense because a bad computer would be inconsistent in spark and fuel. This is why it was so hard to track down a fuel or spark issue. Ran into the same issue with 89 Cadillac with fuel injection that had the same symptoms. Occasional lack of spark and fuel. After replacing all the ignition parts and testing the fuel injectors, it turned out to be the computer. I hope this solves your problem. Best of luck.
Greg

Posted on Jul 27, 2009

  • Greg Margossian
    Greg Margossian Jul 30, 2009

    Kindly rate the solution I've provided if you feel it answered your question. Thank you very much.

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Have you confirmed whether absence of fuel or spark when this condition occurs yet? If no, do you know how to do that, and if yes, which one was absent?

Posted on Jul 26, 2009

  • Mike Butler
    Mike Butler Jul 26, 2009

    Can always spray WD-40 into front of throttle body (like quickstart) and see if it fires up. Take intake air hose/duct off, Open plate at front of throttle body and spray WD for a second or 2 then see if it starts for a second or 2. Test for spark with screwdriver in plug wire & hold handle of screwdriver , then hold shaft of screwdriver 1/4" or so off rocker cover or metal that you can reach, then have someone crank engine.
    Remember, you hold insulated handle.


  • Mike Butler
    Mike Butler Jul 26, 2009

    You could be carbureted too but either way you simply spray into where air enters for a second or 2. Then try to start & if it fires up for a second or so, then you know you have spark & problem is fuel related. Keep me posted, Thanks.

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