Quote:
Originally Posted by avfordguy
MAF supplies both bank 1 and bank 2 so if it was maf issue would be on both banks. Best is to get a good scan tool and run forscan and watch short term and long term fuel trims. O2 sensors are not constant voltage , they go up and down and the pcm determines the average. DTC'S indicating lean means pcm has reached its calibrated maximum to add fuel to get the o2 to desired level. The pcm reads the signal from the o2, if there was a wire issue it would also set a code for short to ground or open.
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Thanks AV!
I have cleaned the MAF, but I was learning if MAF, the upstream sensors would be alerting and I just have the downstream ones (I think).
I have a cheap scan tool, but bought a better one should be here tom and I do have FORSCAN so I will try that later today - didnt know FORSCAN could do real time monitoring, but will check it out.
One interesting thing - yesterday with the ignition off, I ohm'd the four wire harness to ground and couldnt consistently get good ground? Is that normal? I was thinking one of the wires would go to ground. I did get a flash/beep briefly on one but regardless of what i did after i couldnt get that pin to test clean to ground again consistently.
I did get a diagram for the 4 wires to PCM but it is tight under that hood and the PCM wires are bundled up so worried i will do more damage if i start pulling the plugs out to test the wiring is good to the PCM... May be the next step for someone more qualified than me...
**I know enough to be dangerous here so question everything i say... LOL.
Thanks again!!!