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Old 10-03-2013, 04:19 PM   #1
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Engine wants to stall

I have an LS6 with aftermarket cam (unsure what size), LT Headers in an 02 Z28 vert.

I've replaced the IAC, TPS, MAP, MAF, PCV, plugs and wires.

No error codes.

When coming to a stop sign idle drops way down - sometimes around 200 rpm - then back up to ~900, stays steady, and is ready to go.

No vacuum leak that I can detect. Even sprayed break parts cleaner all around the engine and idle never changed.
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Old 10-03-2013, 05:35 PM   #2
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Re: Engine wants to stall

Here is what my car does @ 3:30 into this video:

First 25 seconds of this video ... that is exactly what my car does as well '99 Camaro Z28 MS3 Cam Idle Electronic Cutout - HD - YouTube

This just the nature of a big cam in these LS1?
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Old 10-03-2013, 06:33 PM   #3
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Re: Engine wants to stall

did u get someone to tune the car for the cam? u need to find out what the cam specs are or put it on a dyno an check the open and closed loop data
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Old 10-04-2013, 08:42 AM   #4
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Re: Engine wants to stall

Hunting idle like you are talking is usually a tune problem. I had my 403 idling at 825 RPM's pretty steadily with a 236/248 cam. It just needs a little more base idle air and it should be fine.

Geoff
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Old 10-04-2013, 02:36 PM   #5
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Re: Engine wants to stall

The cam was in the car when I bought it. I assume it's been tuned as it has headers and the O2's have been tuned out.
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Old 10-06-2013, 05:00 PM   #6
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Re: Engine wants to stall

Doesn't mean it was tuned right.

-Geoff
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Old 10-06-2013, 05:00 PM
 
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