1984 Chevy Corvette Check engine light does not flash

Tiny
LITTLELOLA
  • MEMBER
  • 1984 CHEVROLET CORVETTE
Computer problem
1984 Chevy Corvette Automatic

Hello - My "check engine" light is supposed to flash when I start the car but it does not. After checking the bulb and that being ok we bought a new ECM and put it in. Still nothing. I am at my wits end right now because the car won't pass emissions because of this. Any help would be greatly appreciated.

Thanks
Littlelola
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Saturday, November 22nd, 2008 AT 6:22 PM

5 Replies

Tiny
IMPALASS
  • EXPERT
Hello -

I have attached info on the light. If it doesn't come on it requires maintenance and should have thrown a code.


http://www.2carpros.com/forum/automotive_pictures/248015_Picture1_13.jpg



Please go to Auto Zone or O'Reilly's and for FREE they can pull the codes to the car. Most important: Once they check your codes, if they find something and you don't get it fixed and need to get back with us, please make sure you tell us exactly what the code was, number and all. Example, if the code was E0568 O2 Sensor bad. Then make sure you give us all of that. While there for FREE also they can bring their tester out and check your battery, alternator and starter.
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Saturday, November 22nd, 2008 AT 8:17 PM
Tiny
LITTLELOLA
  • MEMBER
Hello again - ok - thanks for the reply - however - this is the second time I have tried to get some info on this issue and the second time I have donated.... Autozone no longer tests ECM's or pulls off codes. There are no codes to pull off - I shorted the A & B pins to retrieve the codes - nothing flashed. Again - I just went out and did this procedure again - no codes.
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Sunday, November 23rd, 2008 AT 1:41 AM
Tiny
IMPALASS
  • EXPERT
Hello - littlelola

I am sorry about the replies not meeting your needs. That is frustrating especially since you have donated. Twice.I appoligize

I searched through about 459 Technical Service Bulletins and there is nothing in there about this problem.

I did find the information below, but you will need an auto electrical shop or the dealer to do the circuit checks unless you are able to do them yourself which you may be able to since I don't know your background.

Also, you said you replaced the ECM, there is a note at the bottom you will see that states: Before replacing ECM, measure resistance between solenoid terminals of canister purge, air switch and air divert solenoids. Replace any solenoid which measures less than 20 ohms resistance

I hope this answers your question better. If not, please get back with me and we will do what we can.

No Check Engine'' Light

Notes

With ignition on and engine off, connect test lamp between white ECM connector pin 20 and 12 volt power source.

If test lamp lights, inspect Check Engine'' light bulb and replace if necessary. If bulb is satisfactory, check circuits 1 and 419 for an open and repair as necessary.

If test lamp does not light, connect test lamp between white ECM connector pin 16 and ground. If lamp does not light, check circuit 439 for open or short and repair as necessary.

If test lamp lights, connect lamp between white ECM connector pin 10 or 15 and ground. If test lamp does not light, check continuous battery circuit for an open or short and repair as necessary.

If test lamp at pin 10 or 15 lights, check ECM engine ground circuits 450 and 450R for an open or short and repair as necessary. If circuits are satisfactory, fault is in ECM or ECM connector. Repair or replace as necessary.

Before replacing ECM, measure resistance between solenoid terminals of canister purge, air switch and air divert solenoids. Replace any solenoid which measures less than 20 ohms resistance
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Sunday, November 23rd, 2008 AT 9:28 AM
Tiny
69CORVETTE
  • MEMBER
Hello littlelola,

I have an '84 that had the same problem. It was the canister purge solenoid. This part is no longer available but I used one for a '83 Chevette and it works fine. The other problem you may have is the new ECM may be toast. You need to correct the problem before replacing the ECM.

Check the EGR solenoid and the wiring to all the solenoids. They get brittle with age and heat. Also, be sure to disconnect the battery before replacing the ECM.

I hope this helps.
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Thursday, December 18th, 2008 AT 7:07 PM
Tiny
IMPALASS
  • EXPERT
Hello -

Thanks 69corvette

Not only do we, but I am sure she appreciates the advice.
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Thursday, December 18th, 2008 AT 7:50 PM

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