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2004 XC70 MAF sensor reading Problems? Fluctuating Idle

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2004 XC70 MAF sensor reading Problems? Fluctuating Idle

Post by Build » Sat Mar 09, 2019 2:22 pm

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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RickHaleParker
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Re: 2004 XC70 MAF sensor reading Problems? Fluctuating Idle

Post by RickHaleParker » Sun Mar 10, 2019 3:30 am

Have you cleaned the MAF sensor with MAF cleaner?

Don't make physical contact with the MAF Sensor active elements. You can break the wire(s) or damage the plate(s) with a slight contact, they are that fragile.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.
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1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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Joined: Fri Mar 24, 2017 7:29 am
Year and Model: 2004
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Re: 2004 XC70 MAF sensor reading Problems? Fluctuating Idle

Post by Build » Sun Mar 10, 2019 6:34 am

Rick, yes, the MAF has been cleaned with MAF cleaner. No physical contact. Thanks



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