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05-10-2009, 06:20 AM #1
- Join Date
- May 2009
- Location
- sgh
- Posts
- 3
blonde- 2004
low, rough, surging rpm at idle after hot start
hello,
having a caprice/statesman 2004 ls1. problem is when starting car while it is still hot from the previous start, the rpm reading goes as follows. starts at 1000, then a few seconds decreases beyond the normal 700-800 to nearly 500, at that point the engine shivers, and if you press on the gas while in drive it will not produce power to move the car.. i would wait for a minute and the rpm would suddenly jump up from 500 up and down quickly a few times, stabilising at the normal 700-800.. then i can drive normally. other than that it is very good in all aspects..
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05-10-2009, 06:25 AM #2
The IAT sensor is in a bad spot and is getting heat soaked when the car sits for a short period and is restarted (like stopping at a gas station). With it reading falsely hot, your mixture is lean, that's why the engine is weak.
What platform are you using to tune with?
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05-10-2009, 12:10 PM #3
- Join Date
- May 2009
- Location
- sgh
- Posts
- 3
blonde- 2004
aha, makes much sense..
anyway, i forgot to mention that while this happens the engine check sign would come on.. but that is just a consequence.. where is the iat sensor located ?
the ls platform
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05-10-2009, 10:32 PM #4
I mean what tuning platform as in which tuning suite.... this is the TUNING section
The SES should not be coming on though. Without the scanner in a tuning package, our ability to trouble shoot is greatly hampered.
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05-11-2009, 11:01 PM #5
- Join Date
- May 2009
- Location
- sgh
- Posts
- 3
blonde- 2004
i dont know info about the platform or tuning.. as i havent come accross that..
anyway, while this low rpm shivering happened earlier i poured water over the stem of the intake (maf, iat) after which the engine self corrected (rpm). i will probably add insulation instead of relocating.
thank you,
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