[Dave80GTSi]

A week has now passed.

Garage temperature in the high 30’s F. Start car, let it idle. Seems fine. Goose the throttle every now and then, and it obediently revs like it should. Monitoring the coolant temps with my Autel real-time display.

After maybe 3 or 4 minutes, once the coolant temp reaches about 100 degrees F, the throttle ‘goosing’ starts to create the stumble, same as the previous time a week ago. Best way that I can describe it would be as if this were a carb car, and the accelerator pump jets are way too rich – the engine stumbles and will not rev.

Continue to let engine idle for maybe another 20 minutes. Idles just fine, but whenever the throttle is poked, the engine stumbles and is non-responsive, same old deal. Continue to let the engine idle until the coolant temp reaches a steady 180 degrees F, and then shut off the car.

Let the car sit for maybe 5 minutes, so to let the engine temps warm up the inlet air passages thoroughly. Turn on the key to calibrate the throttle – about 30 seconds into this, I hear some new sounds coming from the engine – sounds like a step motor tuning on and off a couple of times Then silence. After 90 seconds, shut off key, let sit for 2 more minutes. Then start the car.

No change, exact same symptoms as about a week ago – the engine simply will not run above maybe 2000 rpm. Just on the off chance, I try to drive the car around the block, but no go. I can do nothing but idle the car back home in second gear, and the car is again parked.

At this point in time, I cannot see anything that I have done incorrectly in order to re-calibrate the throttle. I hare followed the various instructions to the letter.

The only conclusion that I can now reach is that the ECU is buggered, and a friendly discussion with ECU Doctors will accordingly be done on Monday.

Thanks - DM