Quote:
Originally Posted by Duke2.6
I suspect that the engine management system is detecting detonation and doesn't have enough control authority to retard the spark sufficiently to eliminate the detonation under load.
...seems to me that rather than replacing a bunch of what are probably pretty expensive parts, just use premium fuel as specified by DB., and if the CEL and codes go away you're done.
Duke
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I was dumbfounded when the misfire would stay on cylinder 7 but 'float' among the other cylinders. (3, 7 and 8 were the most common) But your suggestion of the 'computer' not adjusting properly makes all the sense.
If it was truly a hardware issue, why would it not stay at the same spot.
Duke2.6 you have the best diagnosis!!!!! It's the computer!!!
I just could not justify buying a new car, just cause of an error that happens occasionally.
So, path forward....
Stick with Premium fuel and enjoy the car!!!!!
(As a side note, I recently tried Premium without ethanol and got horrid gas millage. It was just a one time shot, but ...)
Thank you all for your thought (prayers) and suggestions.
My car experience is better because of communities like this.