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Howdy and Newbie with a 1996 z28 problem

This is a discussion on Howdy and Newbie with a 1996 z28 problem within the LT1 forums, part of the Vehicle Specific category; Howdy y'all, I have a 1996 z28 which starts up just fine, but after driving it a bit it starts ...

  1. #1
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    1996 z28

    Howdy and Newbie with a 1996 z28 problem

    Howdy y'all,
    I have a 1996 z28 which starts up just fine, but after driving it a bit it starts to idle down and stumble during deceleration, often stalling. I can recrank it OK, but the problem still persists. Any ideas as to what the problem is? It's not throwing any codes, so ODB is no help. No that's not a typo, whoever invented that system is a old dirty b****rd.
    Any help is appreciated,
    screeb

  2. #2
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    Quote Originally Posted by screeb View Post
    Howdy y'all,
    I have a 1996 z28 which starts up just fine, but after driving it a bit it starts to idle down and stumble during deceleration, often stalling. I can recrank it OK, but the problem still persists. Any ideas as to what the problem is? It's not throwing any codes, so ODB is no help. No that's not a typo, whoever invented that system is a old dirty b****rd.
    Any help is appreciated,
    screeb
    Two things Optispark and/or IAC

  3. #3
    Pathelogical Liar BlackLT1Z28's Avatar
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    94 Camaro Z28

    Optispark is such a bad word.

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    Quote Originally Posted by BlackLT1Z28 View Post
    Optispark is such a bad word.
    Isnt it..worst ignition system ever

  5. #5
    Member Chad97z's Avatar
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    bet ya a dollar the base idle screw is not set properly. read the haynes book.. Should tell ya how to do it. Probably by disconnecting the IAC motor completely and then unscrewing the base idle screw until the rpm reaches like 500 or 600 or 750. Then once the IAC is reconnected it properly adjusts it for cold and warm temps. As it is, probably the base idle screw is shut off completely so only the IAC is being adjusted on the fly and in real time to keep it at idle. If the engine is warm, and if you let off the gas suddenly, then bam there is no air because the base screw is shut, and the ECM tries to catch it from dieing by adjusting the IAC open. Thus causes an unstable idle. Has nothing to do with the optispark.
    Last edited by Chad97z; 02-17-2007 at 11:29 PM.

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