Every so often, while driving, my Service Engine Soon light comes on. My car is a 91 Z28, 305 TPI with 5 spd. When this happens the car runs, accelerates, etc. normally. Do I need to check the codes???

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• 1991 Z28
• Ultra Metallic Blue
• 305 TPI
• 5 Spd Manual
• 3:08 rear axle

members.fbody.com/rwendt/

 

Yes, check the codes.

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Looking for:

87 IROC-Z L98
84 TRANS AM H.O.

 

find a code reader and see what it says, dont take it to a garage, u will get charged an arm and a leg

 

you dont even need a code reader. just get a short wire or paperclip and jump terminals a & b of your aldl connector. if you need to know more on this or you dont know what a aldl is, check this website under tech articles.

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That would happened to me only when i would drive get up to 40-55 mph after a morning start. I got a code 32 which is related to the EGR valve. I replaced the EGR valve and the code never appeared again. I got a little key to check the codes free from Autozone. If you have one near you just ask if you can have a key to check the engine codes(they should give you a key and instruction booklet). Hope this helps

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Shouldn't bother putting this but hey what the heck:
1988 Maui Blue Firebird 305 TBI stock

[This message has been edited by Highwind (edited September 17, 2000).]

 

R,

If I were getting an indicator light warning of a problem, I would want to check it out. You can scan the ECM for codes with no more than a paper clip and information:

The paper clip is your responsibility, the data is here:
GM Error Codes.pdf.

You'll need Adobe Acrobat Reader to view the file. (See link below.)

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Later,
Vader
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"Make Me Bad"
Adobe Acrobat Reader 4.0

 

My car does that too. It all depends on how long I let it warm up in the morning. If I let it warm up for a couple of minutes, it won't come on during my trip to school. (15 miles) but if I'm in a hurry and only let it warm up for like 30 sec. then it comes on.

 

The paper clip is idea is the best idea. Sometimes, if you floor it your knock sensor will come on briefly because of the all of the vibration.