1992 Auto, sat for the winter, was running when parked. Now when I start it cold, it will run fine for a few minutes then die and won't restart until it's cold again.
Yesterday I connected a scanner and did the KOER and cylinder balance tests. Passed everything. I mention the cylinder balance test because of this:
The scanner wants the car to run at 2000 rpm for two minutes before starting the KOER test. I was afraid it wouldn't run long enough for this but it did. So the scanner took over and ran all the tests with failures including the WOT throttle test. THEN I ran the cylinder balance test for the heck of it which takes another minute or two. It was the longest I had seen the car run since last year, about 5 minutes or more total I'd say, BUT as soon as I exited out of the program on the scanner, the engine died. It was almost as if the scanner had been controlling the ECU for the entire test and when it disconnected the ECU couldn't run the engine by itself.
So I'm suspecting the ECU...bad capacitors or whatever after 26 years and so it's just crashing when it warms up, therefore no codes.
Anyone agree/disagree or seen this before? The car is mint otherwise and has never been messed with under the hood. I wondered about the DIS but wouldn't there be a code in the ECU if that was causing the stall/no start?
Any help is much appreciated
Kevin
p.s. I have a working ECU from an 89 XR7 Auto. I'm sure the programming for a 1992 is a little different, but would that ECU work well enough in my 92 to prove/disprove my theory?
Yesterday I connected a scanner and did the KOER and cylinder balance tests. Passed everything. I mention the cylinder balance test because of this:
The scanner wants the car to run at 2000 rpm for two minutes before starting the KOER test. I was afraid it wouldn't run long enough for this but it did. So the scanner took over and ran all the tests with failures including the WOT throttle test. THEN I ran the cylinder balance test for the heck of it which takes another minute or two. It was the longest I had seen the car run since last year, about 5 minutes or more total I'd say, BUT as soon as I exited out of the program on the scanner, the engine died. It was almost as if the scanner had been controlling the ECU for the entire test and when it disconnected the ECU couldn't run the engine by itself.
So I'm suspecting the ECU...bad capacitors or whatever after 26 years and so it's just crashing when it warms up, therefore no codes.
Anyone agree/disagree or seen this before? The car is mint otherwise and has never been messed with under the hood. I wondered about the DIS but wouldn't there be a code in the ECU if that was causing the stall/no start?
Any help is much appreciated
Kevin
p.s. I have a working ECU from an 89 XR7 Auto. I'm sure the programming for a 1992 is a little different, but would that ECU work well enough in my 92 to prove/disprove my theory?