Question about 1996 Chevrolet Caprice Classic

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Hesitation under load around 5% throttle

In drive with the brake applied, given slight throttle hesitation occurs. It is timed as it hesitates for approx. 1 second, then runs fine for approx. 1 second. The cycle repeats over and over, only at that throttle position (~3 - 7%). I have been noticing it more and more preeminent as the weather is getting into 70's. Runs fine...-ish cold.

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  • Yevgeniy Apr 24, 2009

    I throttle the engine with the brake applied so that I am not rolling down the road not paying attention to traffic. It does hesitate under normal driving condition, in any gear at any speed - just at that throttle position. I have cleaned neither the upper intake nor the ISC. The check engine light did come on for about an hour when it rained 3 days ago, and I have not had the time to pull the code yet. Autozone told me they cannot retreive stored codes, only the ones that are occuring right now, sounds like a bunch of you-know-what, but I wasn't gonna argue with the guy, ya know? So I am waiting on a buddy with an OBD2 scanner, but in the mean time I wanted to know if there is anything I can check that might be a common solution.

  • Yevgeniy Apr 30, 2009

    After unplugging the vacuum hose to the egr valve the engine runs much better. Everytime the valve would open, the engine misfired. Is it simple to clean?

  • Yevgeniy May 20, 2009

    Well, after poking around with different sensors I still have nothing. There are no codes present. I did put a timing light to it and noticed that the timing gets advanced way ahead, something like 45 degrees when the hesitation occurs. the only time i see this kind of timing advance is when you burp the throttle, and only for one cycle maybe two. Not sure if this is a symptom or a cause.

  • Yevgeniy May 20, 2009

    Not advanced, retarded. The timing gets retarded. normally, for cylinder one, the the timing is in the range of 12 to 11 0'clock, depending on throttle position. during hesitation the spark occurs around 2 o'clock.

  • yadayada
    yadayada May 11, 2010

    U need to take this to the dealer, it won't get fixred here.

  • yadayada
    yadayada May 11, 2010

    the valve is not the problem, the vacuum control for the valve is, once again run the trouble codes

  • yadayada
    yadayada May 11, 2010

    get the code, 96 up systems that have a problem will record a code for it, clean the parts mentioned.

  • yadayada
    yadayada May 11, 2010

    why would u throttle the engine with the brake applied? does it hesitate under normal take off conditions? have you cleaned the upper intake and ISC (idle speed control) motor? what if any trouble codes do u have?


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Check throttle position sensor!! at throttle plate on side of throttle body.

Posted on Sep 01, 2009

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