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1993 Chevrolet Lumina Question: car idle bounces, then when at stop sign it either stalls or it sputters.

 

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maika87, Seattle, WA, October 18, 2013, 20:03
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so when im driving the car it drives good but when i get to a stop light or stop sign the car sputters and the car sounds like it wants to shut off. the rpms bounce at 500 and some time drops to 400 when at a stop.
and when the the rpm gauge drops the dash lights dim a little.
i replaced the IAC sensor, cleaned the throttle body, did a idle reset, put some injector cleaner in, and problem is still there. if anyone has any ideas PLEASE HELP

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  • Answer #1

    G. T. Service Center (4215 Answers) , Stephenville, TX - (254) 638-3236
    ProfessorG October 18, 2013, 20:22
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    Which engine

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    maika87, October 18, 2013, 20:41
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    chevy lumina 3.1 v6

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    ProfessorG, October 18, 2013, 20:42
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    Do you have a Tech1? Just trying to help, if you reset the idle you must have a Tech1.

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    maika87, October 18, 2013, 21:11
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    what is a tech1?

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    ProfessorG, October 18, 2013, 21:16
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    It's then scan tool used to relearn idle on a 3.1 v6. Not sure how you reset the idle without it. When you change the IAC-Idle Air Control motor it has to be relearned with a Tech1. I'm sure you have more problems, need to run data for short term fuel -

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  • Answer #2

    pushrod October 19, 2013, 04:29
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    Check the vacuum connection port at the rear of the intake for a cracked or loose hose.

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