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Fuel trim issue RESOLVED!
Follow up on this over a year later.
First the car threw another CEL later last summer. I asked a 'new to me' shop very close to my home to look into it while doing the yearly oil change. He supposedly did a smoke test and found no intake leaks, claimed the MAF was fine, and cleared the codes which did not return. The LTFT values were still running +8-9% when I got the car back however. So much for curious mechanics.
This week I got another CEL, hooked up the scan tool and found the LTFTs running over 20% on both sides!!
So I went down to the auto parts store, bought a can of CRC MAF cleaner and a set of security star bits for a total of $22. Gave my MAF a good thorough cleaning, tightened the clamps on all the intake manifold joints and now the fuel trims are all at 0%.
Should have done this last year.
Clean your MAF, easy and solves many issues.
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