Quote:
Originally Posted by BimmerBreaker
Unplugging the MAF triggers a CEL - resetting the CEL resets the readiness monitors. You need those readiness monitors to be set in order to pass emissions....
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No, unplugging the MAF didn't trigger a CEL on my M54, but using the faulty Siemens MAF did, after about 5 miles. It set codes P0102, P0171, and P0174, triggerring the MIL (SES, CEL) light, upon which time I put in the second cheap MAF, for my return trip home. I cleared the MIL/SES/CEL, and watched the Torque Pro display during the 70 mile return trip, to see if the fuel trims would start stabilizing at highway speeds.
LTFTs started at zero, as expected, but during heavy Saturday night traffic, they rose as high as 9, with the STFTs trying to bring them down. Only when I hit the open road for 20+ miles did they fall, to as low as 4-5, but once again entering into heavy stop & go traffic, they rose to 6-7 (nowhere near the ridiculously high numbers given by using the Siemens MAF).
So, just now, after reading your comment, I went outside and snapped a few screenshots of my 8" tablet that I use for the Torque Pro app.
Sorry about forgetting to turn off the flash...
high LTFTs, but witin limits
MAF code was set on trip home, but not the lean codes
showing emissions readiness monitor, before clearing the code
after I cleared the single code
yes, now I'll have to drive some more to be ready for testing
I agree with you, that I'm going off on tangents, with work-arounds and such, but I've pretty much exhausted my diagnostics ability (and I don't have the $$$ to make a dealer or Indy richer, with no guarantee of a true fix), so after running out of options, I'm going to modify the system (either in Star Trek's "Kobayashi Maru situation" fashion, or like Steve McQueen did in real life, trying fringe medicine to cure his cancer). Unless I fry the DME, what can I lose?