2004 XC70 MAF sensor reading Problems? Fluctuating Idle
Hello,
My 2004 XC70 is having fluctuating idle speed (500-1200)/stalling at idle problems. It runs great except at idle. I have the following codes P2188 -system too rich 261A - long term trim 262A - long term trim The throttle body is clean and smoke test showed no vacuum leaks. The spark plugs, coils, filters, etc are new or fairly new. I checked the signal from the MAF which showed fairly steady 1.58-1.6v at idle (cold), 1.16-1.18v idle (warm). If I accelerate slowly the reading is goes to 2.4v at 2000rpm, 3.2v at 3000rpm. If I accelerate quickly the voltage goes to 0 when I open the throttle, then recovers to shown readings. The car accelerates strongly, no hesitation. Is this normal for the MAF? Oddly enough, if I unplug the MAF, I get CEL and code for the MAF but the car idles perfectly smooth, no stalls, runs great. When I plug it back in, it goes back to fluctuating and stalling. Ideas? Thanks, Jim |
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