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Author Topic: MAF failure?  (Read 1280 times)

ScarbSaab

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MAF failure?
« on: 10 July 2023, 06:35:27 PM »
The MY04 estate has lost some of its go, so I've had an OBD data recorder on. The Airflow Mass Meter reading is at 0g/s most of the time on the recorded trips, and all over the place when it does read. It could be wiring so I will check it when I get chance, but the MOT is on 25th and I don't want it failing for lack of a working part. Has anyone experience with the failure mode on the MAF? Do they read erratically or is that more likely to be connection? I'm tempted to get one ordered, but with both cars to go through the MOT...
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sgould

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Re: MAF failure?
« Reply #1 on: 10 July 2023, 08:53:54 PM »
If you are getting 0g/s, it may be the MAF or it may be the wiring.  I would put a multi-meter on the pins and wiggle a few wires to see if there's a break.
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ScarbSaab

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Re: MAF failure?
« Reply #2 on: 10 July 2023, 10:22:23 PM »
Thank you for the confirmation, I will take the multi-meter with me tomorrow.
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sgould

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Re: MAF failure?
« Reply #3 on: 11 July 2023, 08:48:11 AM »
When I had a MAF failure, one of the three thermistors had come adrift.  They are just a thin wire welded on.
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carrera

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Re: MAF failure?
« Reply #4 on: 24 July 2023, 12:25:17 AM »
Brief diagnostic suggestion:

Unplug the MAF & the car should run fine

Unplug the MAP & if the car doesn't run there's a problem with the MAF
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ScarbSaab

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Re: MAF failure?
« Reply #5 on: 25 July 2023, 10:55:28 PM »
Thank you for the suggestion. I've only just seen it and the estate is currently getting welding work done for the MOT, so I will get onto that when she returns home.

The younger car has lost even more puff! It felt fine when cold, but after a while going flat in the mid range and lacking power. The recorded trips show the MAF reading fine for about 10 minutes before going to 0 for the rest of the trip. Wiggling the wires didn't show any changes with the multimeter so I have fitted a replacement MAF tonight.
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