My car is at the Chevrolet house and they are is really confused on this issue because this car is having strange issues. The car itself does not throw any codes at all but when the car warms up several things seem to happen. First the car seems to run like the timing is retarded and then there seems to be a lag spot in the accelerator response at about half throttle and when it does this it shifts hard between first and second. it also has a slight surge. Then when the cars cold it sometimes runs great like not a problem one.

I know it's not the opti because we changed it out along with the fuel pump, fuel filter, plugs and wire set and it runs exactly like it did before we replaced this all thinking this would have knocked out the problem.

He tech said the he see's the data and it all shows within spec's but it did bring up the ASR a loss of data on his scanner couple of times which the ECM controls also. He said that because apparently the ECM and the ASR share data with each other, he thinks it could be either.
We hate throwing parts at it but it all seems to lead to the ECM or could be a ASR problem. The guy seems to be a good tech and is a GM master tech.
So it looks like the only thing is left to do is replace the ECM and prom (going to send it out and have it re-manufactured) hoping this will fix the problem. If not may have to then look at the ASR.
If the car would flash a SES code it would at least give us a starting point but not a code one except a loss of data to the ASR that one time it acted up.
They and us are just at a total loss on this car of which way to go.
BTW It's 92 LT1 with auto tranny

 

I know of nothing in the ECM programming that deals with ASR and think that would be dealt with in the Central Command module which may also be referred to as the Body Control module.

 

Have you ran the car without the ASR activated?

Did you try removing the fuse for the ASR? It WILL set codes but you will not get any timing retard signal to the ECM. The ECM does not NEED ASR to make the engine run at all. The ASR can also command the throttle to close and brake intervention via ABS at low speeds.

FYI, the 92's have a NON-electronic automatic transmission so anything shift related is either engine, transmission (internally) or linkage/cable related.

IMHO, I would focus on the engine.

Your statement makes it seem like it runs better cold/cool rather than hot.
Also you mention a surge.
No way ASR is likely causing this unless it is seeing something erratic and closing the throttle and changing ignition timing. He should be able to see ASR/ABS data on his scan tool. I can and I don't have a Tech 2 or Tech 1. Ditto with any commanded timing retard that should be able to be seen.

Also, has anyone done some amperage ramps on your OLD fuel injectors. The GM Multec 1's are junk. The drive-ability issues related to them are well documented. Its an easy test. IF your Master Tech doesn't know what a current (amperage) ramp test is on a fuel injector find a new shop that does.

 

Yes, they at Chevrolet and and the Corvette shop have both done an amp test on the injectors and did a fuel a pressure test and every thing is normal and even gave me the reading (which escapes me now). Now, they did replace the ignition module and they said it seems better but still has the lag in the throttle response. When the car runs right the tranny shifts smooth just as it should. But when it acts up that's when you get the a hard shift on the 1-2 shift.
Today they said it acted up when it was cool which it rarly ever has done.
When I do tell them what I read or hear here they get sort of get aggravated I think because I think they feel I telling them what to do. So I'm going to let them do there thing and call back Monday. But again they seem to think it may be the ECM because almost everything else seems to be giving perfect readings.
When I talk to them on Monday I'll mention the pulling of the ASR fuse and see what they say.
To describe the feeling even more it has (and I asked them about it) is a like a clogged converter or collapsed exhaust pipe. I myself have seen this before and they were going to check that out too. I feel confident that they will find the problem as they are a "Corvette shop only" and work on nothing else but Corvette's
I have expressed feelings that I don't want them to just throw parts at it at my expense and they told me "no we're not parts replacers"...LOL