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AWD - 2004 XC70 MAF sensor reading Problems? Fluctuating Idle

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2004 XC70 MAF sensor reading Problems? Fluctuating Idle V70-XC70

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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    2004 XC70 MAF sensor reading Problems? Fluctuating Idle V70-XC70

    MAF sounds good, when you unplug it is should idle nicely as it is using the default settings.

    How old is the front O2 sensor?

    Did you check the fresh air tubes for a loose connection?

    What is the status of the PCV system and the PTC?

    --
    Keeping it running is better than buying new





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      2004 XC70 MAF sensor reading Problems? Fluctuating Idle V70-XC70

      Klaus,

      The front O2 has 3k miles on it.

      By fresh air tubes, do you mean from the air dam to the air filter box? If so, it seems good. How critical is it? All the other turbo piping has been smoke tested to 20psi and shows no leaks.

      It has been awhile since the pvc was cleaned but I couldn't find the exact mileage. With the engine running, there's no smoke from the dipstick tube so I thought it was ok for now.

      I haven't checked the ptc and it has 150k miles on it. I'll test it.

      Thanks for the good ideas!

      Jim





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        2004 XC70 MAF sensor reading Problems? Fluctuating Idle V70-XC70

        Just do a glove test.
        --
        Keeping it running is better than buying new





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          2004 XC70 MAF sensor reading Problems? Fluctuating Idle V70-XC70

          I have a lot of positive pressure at idle, at higher engine rpm, it blows the tightly sealed glove off. It's time for a pcv clean.

          Is there a way to reroute the pcv box so it's easier next time, a reroute kit?

          Thanks Klaus,

          Jim





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            2004 XC70 MAF sensor reading Problems? Fluctuating Idle V70-XC70

            Re-routing is not possible. Don't forget the PTC valve on the air intake, it also gets clogged.
            --
            Keeping it running is better than buying new





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