Quote:
Originally Posted by jcp123
... under 3% correction for your long terms is great; the rule of thumb I've heard is that more than a 10% correction is when you need to start worrying.
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An interesting thing then is that short term trims will read very lean, sometimes way over -10% and often under high steady load (climbing a 1.5 mile steep hill on my commute) I have seen short term trims of -26%. My long term trim might be deceptive because P&G has always produced modestly positive longterm trim, such as +0.78 or +1.56. So what happens on the freeway now that I have taller tires and am steady cruising at light throttle is the longterm trim gradually moves into negative territory. If I had a longer ride it might get -10% or higher eventually. That make sense? If true, my car has been possibly feeding unburned gas into the CAT for a VERY long time.
I resistance tested my ignition wires just now on a lunch break: the #4 with the unburned gas on the plug has oddly low resistance in the wire. I got a bunch of reading near zero on the 20k scale. See attached notes:
Number 4 wire is faulty, I gotta think.
[EDIT: AND I TOTALLY WILL CHECK THE OBD2 DATA OUTPUT FOR THE DOWNSTREAM SENSOR. THX.]