Check Engine Light
Thread Starter
Advanced
Joined: Aug 2005
Posts: 54
Likes: 1
From: Lakeland Florida, Hastings Michigan
Check Engine Light
How do I turn off a check engine light on a 1981 Corvette?
Its pre- obd1. I have tried unhooking the battery and that doesnt work.
The car runs great just want to turn off the light.
Any suggestions?
Thanks
Jerry
Its pre- obd1. I have tried unhooking the battery and that doesnt work.
The car runs great just want to turn off the light.
Any suggestions?
Thanks
Jerry
Race Director
Joined: Jul 2004
Posts: 12,672
Likes: 329
From: Scottsdale Arizona
Jerry,
You need to run the built in diagnostic to figure out what is upsetting your computer. Once you post the code(s) we can help fix the problem.
To run the diagnostic, you'll have to jump the ALDL connector which is located under the ashtray. If you look closely at the plug, two of the end terminals have a smaller divider between them. These are the two that you'll need to connect. I like to use a staple, but anything metal will do.
With the engine off and the ignition in the run position, jump the terminals (A and B if I recall correctly). You should hear some clicking noises from the carb solenoid (this is good) The "check engine" light will begin flashing. All you need t do is count the flashes.
It should start with a series of one flash followed by two (again if I remember correctly) with a short pause between them. This is normal.
You should then write down any two digit codes and we'll go from there.
You need to run the built in diagnostic to figure out what is upsetting your computer. Once you post the code(s) we can help fix the problem.
To run the diagnostic, you'll have to jump the ALDL connector which is located under the ashtray. If you look closely at the plug, two of the end terminals have a smaller divider between them. These are the two that you'll need to connect. I like to use a staple, but anything metal will do.
With the engine off and the ignition in the run position, jump the terminals (A and B if I recall correctly). You should hear some clicking noises from the carb solenoid (this is good) The "check engine" light will begin flashing. All you need t do is count the flashes.
It should start with a series of one flash followed by two (again if I remember correctly) with a short pause between them. This is normal.
You should then write down any two digit codes and we'll go from there.
Last edited by CA-Legal-Vette; Mar 30, 2009 at 01:21 PM. Reason: typos
Burning Brakes
Joined: Dec 2007
Posts: 952
Likes: 0
You repair what is wrong. PS, it's in open loop, and not operating as well as you think it is.
