Copper Nine Eight

I don't think my obd1 is working. My check engine light is on so I tried to jump it but it doesn't flash. What can I do about that? 1985 delta 88. Thanks

quaddriver

key on, engine off, with jumper wire attached and it did not flash out a 1-2 sequence 3 times?

Copper Nine Eight

I used a paper clip but nope. Nothing

Olds64

Go to an auto parts store to see if they have a scan tool that is compatible with the early GM connector. They generally read codes for free.

Copper Nine Eight

They don't do it for the early GM'S:/

don71

Do you have any factory manuals referring to your model? You might want to get some to help understand this system. Old school tuning and understanding of engines will be a plus. This era still responds to all those principles, like vacuum and timing.

Many people have bypassed all these early computer controlled components through the years. Some others simply put a piece of black tape over the light...and called it good.

How is you engine running?

geardoc66

The carbureted cars used a driver module for the check engine light since the engine could run without the computer. It was designed to turn the lamp on if the ECM was unplugged, unpowered or otherwise inoperative. Here is one of the procedures to diagnose the symptom you describe that might help.

Copper Nine Eight

Thanks man! I think this might help! Can I ask what kind of book that is?

geardoc66

That is from a GM training manual I received in a Delco Tech class I took back then.

Copper Nine Eight

Man. That's a neat book to have. that's pretty handy!