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

Check Engine Light

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Old Jul 21, 2005 | 06:23 PM
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Default Check Engine Light

I have been posting to the General board and maybe I should be asking my question here.

I have an '84. My check engine light comes on when I start the car, goes out, and after about 15 minutes it comes on and stays on.

Is there a problem in driving it with the light on? I just had the cooling system flushed and it passed CA smog. Any thoughts?
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Old Jul 21, 2005 | 06:52 PM
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Originally Posted by valkryder
I have been posting to the General board and maybe I should be asking my question here.

I have an '84. My check engine light comes on when I start the car, goes out, and after about 15 minutes it comes on and stays on.

Is there a problem in driving it with the light on? I just had the cooling system flushed and it passed CA smog. Any thoughts?
I believe I have the same engine in my 91 camaro.... check engine light coming on when you start car is probably normal....it's when it comes on after you have been driving that isn't normal.

It really may have nothing to do with cooling system and smog tests might not turn up the problem either.

You need to get someone, or do it yourself, to pull the stored codes from the ECM

They will tell you what's wrong

seeya
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Old Jul 21, 2005 | 06:57 PM
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If the light comes on, whether it stays on or not, after the engine is started, a code (or more then one) has been set. Check to see what codes you have stored and follow the trouble shooting charts in your factory service manual, to cure your car's faults. It can't be said what the consequences of driving the car are without knowing what (which codes are set) is wrong.

RACE ON!!!
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Old Jul 21, 2005 | 07:06 PM
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Originally Posted by jackdaroofer
I believe I have the same engine in my 91 camaro.... check engine light coming on when you start car is probably normal....it's when it comes on after you have been driving that isn't normal.
I would expect your '91 Camaro to have an iron headed L98. Valkryder's 1984 is an L83, Crossfire. At least in the mid 1980's, the check engine light is supposed to light with the "key on, engine off". That is a check that the light is functioning. If the check engine light comes on or remains on after the engine starts, it is indicating the ECM has codes set.

RACE ON!!!
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