C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

87 surge issue. When cold.

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Old Jun 9, 2010 | 08:57 PM
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From: Victoria Harbour
Default 87 surge issue. When cold.

Hi:
Just wondering if someone can point me in the right direction.
When i sart the car cold, It surges.... 400-900 RPM
No codes, new fuel pump, TPS set right. IAC set right.
It doesent seem to do this when its warm? Could it be a VAC line somewhere..... where do you suggest i should start to look.:o
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Old Jun 10, 2010 | 12:04 PM
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No one?
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Old Jun 10, 2010 | 01:24 PM
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Originally Posted by Benny771
where do you suggest i should start to look.:o
Vacuum lines. Easily cracked and tough to find. I have been replacing the hard lines with flexible tubing to resolve problems.

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Old Jun 10, 2010 | 01:52 PM
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my 86 does this as well,but only the first start of the day..I replaced all vacuum lines I could see but didn't help..so far it hasn't affected anything that I can tell,it goes away as soon as I put it in gear and start driving..sorry I couldn't be more help but I'll follow the post and see if you find a solution. Good Luck
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Old Jun 10, 2010 | 04:06 PM
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From: Victoria Harbour
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HAve any of you changed anything on your cars.....eg throttle bodies? Which in theory affect you idle?
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