|
I had a bad AMM, but no CE light. It was not bad enough to cause the adaptation values to trigger the CEL, but enough that I could feel a degradation in performance. Others have a CEL and a going-bad AMM, but can't feel a difference.
Now, we did see evidence of the AMM going bad and used a "known good test unit" and it cleared up the slight running problem I did have.
As to what the running problems are for a going south AMM: (can have one, or many, or none)
1. Stumble when accelerating.
2. Surging idle.
3. Uneven idle.
The AMM's job is to measure the density of the incoming air charge. If it is malfunctioning, the FI system will compensate and the air/fuel ratio will not be correct, meaning you have a rich-run condition.
Do not bother cleaning it. It might work, but only for a short time. Also, those of us that had our AMM's last a long time (my original one lasted seven years 165K) seem to be ones that change the engine air filter often, and use only OE filters.
Instead of us listing the symptoms, why don't you tell us what problems you are having?
|