Okay. The car is now completely FIXED! For anybody that wants to track the full repairs just look at this cars history. See all the things that were done and replaced. Most was a waste of time and money. There were actually 3 real issues that were problems.
#1 Stalling out and not restarting quickly and overtime each stall it took longer to recover to start again. Cause: 1 Faulty fuel injector on each side of the engine. #1 & #2 injectors were out of spec on OHM's. This caused the ECM to become confused and shut off the injectors all together. Once the injectors were replaced the stalling out stopped completely and the car was drivable and reliable. It never stalled again.
#2 Engine running rough and stumbling under light engine loads and poor fuel mileage, full throttle was good. Cause: Cracked or broken plastic vacuum tubes on the engine. The fuel pressure regulator on the 2.8 Multi port FI is controlled by vacuum. Loss of vacuum would not let the regulator open as fuel demand lightly increased, full throttle quickly over came the problem but only under 3/4 throttle or more, once you let up to cruise the rough running and stumbling returned. Replaced all the plastic tubes and rubber hoses in the engine compartment. This restore normal running and fuel mileage
#3 The worse problem: Code 43 Knock sensor issue. Code 43 retards engine timing as much as 14 degrees. Massive amount of time and money was wasted here. ACTUAL CAUSE: Faulty memcal or prom chip. Chip was corrupt and sending false voltage spikes that the ECM thought were " Detonation Knocks" even at idle, which can not happen. I tracked it down the the memcal chip. Once the chip was replaced the timing was restored and the engine returned to completely normal function. If you have any of these issues you might want to track this cars history to see the long drawn out repair attempts. Make sure the replacement memcal chip has the same code as the one in your car or it may not work correctly and might damage other components.
Friday, January 16th, 2026 AT 3:04 PM