Check Engine Light on 1972 Avanti II

[CBS Avanti]

I am relatively new owning this Avanti II, or any Avanti for that matter. It came with a battery isolation switch on the negative battery post to prevent a phantom drain. It came with a Sears 2-year battery. God knows how long it had been in the car. I have a new one now.

When I fire it up, the Check Engine warning light comes on. Because of the age of the car, the documentation on why it came on doesn't exist... or let's say, I can't figure it out.

Does any body here have any ideas what may be the issue?

Thanks,

CBS

[mfg]

1 hour ago, CBS Avanti said:

I am relatively new owning this Avanti II, or any Avanti for that matter. It came with a battery isolation switch on the negative battery post to prevent a phantom drain. It came with a Sears 2-year battery. God knows how long it had been in the car. I have a new one now.

When I fire it up, the Check Engine warning light comes on. Because of the age of the car, the documentation on why it came on doesn't exist... or let's say, I can't figure it out.

Does any body here have any ideas what may be the issue?

Thanks,

CBS

Your Avanti has what GM Called “Computer Command Control System”

That check engine light is part of that (emissions) system.

It should go off a few seconds after you start the engine…..If it stays on, it does not mean there is an engine problem… The light staying on indicates a problem in your Avantis emission system… which could be a multitude of items.

There’s a plug under your dashboard that a code reading device can be plugged into which may zero in on the issue.