........My question is , did all 3rd generation z28's come with an ECM? My car is an 85 z28 lg4 4 bbl auto. There is no indication of a computer. Did someone swap engines or did some come noncomputerized? Thanks.........Zapr.

 

Yes, all US destined 3rd gen f-body's have an ECM from the factory.

In your case the '85 LG4 ran a computer controlled carb (CCC). The ECM controlled the TCC, cruise AFR (via mixture rods in the carb), EGR, AIR, spark timing, and may be a few others I missed.

If the ECM has been yanked at a minimum you will need a standard centrifugal/vacuum controlled distributor.

A quick check for an ECM would be the SES light. It should illuminate with key on, engine off. Then turn off once the engine is running. If so then ECM is there, if not, then the bulb can be missing or burnt out, or the ECM is history. . .

RBob.

 

........What does this mean when it comes to an emissions test if the ECM was yanked?........Zapr.

 

In that case, it's not emissions legal.

But whether or not you pass the test depends on what test procedure is utilized in your area, and how closely the inspector actually checks.

 

.......I guess I should mention I live in Canada. RBob mentioned all US destined 3rd generations came with ECM's. What about Canada? Thanks for your answers. You guys are a wealth of information......Zapr.

 

From what's in the GM parts catalog, I believe at least some of the LG4 cars sold in Canada were not computer controlled.

Don't know about '85 specifically, though.

IIRC, the parts microfiche lists a vacuum advance distributor as being used on the export models; also should have a non-computer controlled carb. The CCC Q-jets can be easily identified by two electrical connectors attached to the carburetor -- one for the mixture control solenoid, and the other for the TPS sensor.

I've no idea what the Canadian emissions requirements are, so disregard my previous post about the legality.