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Old 07-16-2002, 02:22 AM
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Post 87 Firebird 2.8L

I have recently aquired this car and I have been putting some money into it to get it running good and road worthy. This car has sat for at least 3 years and I've done a few things to it but I was wondering if anyone had any ideas why the damn check engine light keeps comming on. There is no evidence of anything wrong. I notice when sitting at a light for about 3 min. the car will surge slightly and then the light comes on. It goes off after a while but then on again. Maybe I should take it to the shop? I'd like to handle it myself. Any thoughts? Thanks

Spidey

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Old 07-16-2002, 04:23 AM
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get a new oxygen sensor
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Old 07-16-2002, 07:40 AM
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I agree with tom. a fouled 02 sensor it could be. but to eliminate the guesswork take it to a shop with a scanner to read the ecm on what is stored. if there is a trouble code in there, which if the check engine light came on there is, it will point exactly to where the problem is. around here most shops only charge 35-40 dollars for this. good luck.
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Old 07-18-2002, 01:06 PM
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could be several things causing the O2 sensor to read rich. Scan the codes, as mentioned allready. another common problem would be a sticky EGR valve. That could give you the idle problems you mentioned, as could a plugged catalytic converter. (that would be much more rare) How is the pulling power as you wind it up? Good Luck!
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Old 07-18-2002, 08:08 PM
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[quote]Originally posted by Spiderman:
<strong>I have recently aquired this car and I have been putting some money into it to get it running good and road worthy. This car has sat for at least 3 years and I've done a few things to it but I was wondering if anyone had any ideas why the damn check engine light keeps comming on. There is no evidence of anything wrong. I notice when sitting at a light for about 3 min. the car will surge slightly and then the light comes on. It goes off after a while but then on again. Maybe I should take it to the shop? I'd like to handle it myself. Any thoughts? Thanks

Spidey</strong><hr></blockquote>
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Old 07-18-2002, 08:16 PM
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[quote]Originally posted by Spiderman:
<strong>I have recently aquired this car and I have been putting some money into it to get it running good and road worthy. This car has sat for at least 3 years and I've done a few things to it but I was wondering if anyone had any ideas why the damn check engine light keeps comming on. There is no evidence of anything wrong. I notice when sitting at a light for about 3 min. the car will surge slightly and then the light comes on. It goes off after a while but then on again. Maybe I should take it to the shop? I'd like to handle it myself. Any thoughts? Thanks

Spidey</strong><hr></blockquote>
have the same problem with my 3.1,pull your egr valve off,there should be a u shape underneath it with a hole that leads to your plenium.get some top engine cleaner(can be bought at gm dealer)pour it in the hole,open butterfly to throttle body and look to see if it is running out of the hole.if not let it sit in there and get your self some little wire brushes and try to clean that hole out.if it is completely blocked take a coat hanger and try to force it through,it will take some effort if it is blocked.if the hole is not blocked you will be able to see the brush or coat hanger which ever you use come out of the hole in the throttle body.i have had the same problem for three months now and just recently someone told me to do this and it corrected my problem.once you get the hole cleaned out take a rag and stuff it in the throttle body to get the excess fluid out of there before you put it back together or start the vehicle.
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Old 07-22-2002, 12:07 PM
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more times than not its an EGR solenoid failure.. run a vacuum line from the FPR to the small tube on the top of the EGR valve.. T it into the feed line of the solenoid.. that shuts up the lights on the 2.8s we use.

----------
12.92@109mph out of a 2.8 automatic.. whats your excuse?

[ July 22, 2002: Message edited by: 1FST2M6 ]</p>
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Old 08-18-2002, 02:05 PM
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Hey, Thanks for all your help. I found an old haynes manual and figured out how to read the codes. Turned out to be just as everyone thought. The Oxy sensor. While digging around I also found that the hose to the EGR was split and leaking. All said and done the car runs great now and looks even better. Best $400.00 I ever spent. It's time to start getting her ready for some more HP under the hood. Thanks,
Spidey
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