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Thread: MAF sensor issue?

  1. 7th September 2012, 08:10 PM #1
    PeterH's Avatar
    PeterH
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    MAF sensor issue?

    Hi everyone, was driving my 2001 HSE 4.6 up the Westgate the other night and noticed the engine hesitating under load, felt a bit like not enough fuel being delivered.
    It was fine from a standing start, but the idle was slightly rough.
    From my past experience with classic Rangies, I gave the throttle body a good clean out and also cleaned the contacts on the maf sensor plug.
    Hey presto, running much better, idle perfect, no more hesitating under load.
    Tonight the same problem returned, I'm guessing it must be something to do with the maf sensor.
    Does anyone have any tips as to how to tackle this problem?
    Can they be cleaned, or is it time for a new one?
    Cheers, Pete.
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  2. 7th September 2012, 10:34 PM #2
    Hoges
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    Spraying the sensor with Carburettor cleaner or non-residue disc brake cleaner often gets rid of any stuff which may have collected on the MAF

    It may also be an electrical issue with the spark breaking down under load...have you checked the plugs/ignition leads and coil block? I'd also be checking all earth points....
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
    2023 Ineos Grenadier Trialmaster (diesel)
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  3. 8th September 2012, 02:19 AM #3
    Derham18B4
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    I would also check the fuel pressure at the fuel rail. If possible connect it to the fuel rail and take it for a drive and see if there is sufficient pressure.
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  4. 8th September 2012, 06:58 AM #4
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    PeterH
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    Thanks for the replies.
    I usually suspect the sensor with these type of problems before looking deeper.
    I've never had to play around with the maf sensor before though.
    Is it safe to spray the sensor with carby cleaner?
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  5. 8th September 2012, 12:32 PM #5
    33chinacars
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    You can buy proper MAF sensor cleaner. Got some for my P38 when I owned it . Most good auto shops should have it

    Gary
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  6. 8th September 2012, 04:37 PM #6
    BusinessConnected
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    CRC Branded "MAF Sensor Cleaner".
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  7. 8th September 2012, 07:00 PM #7
    Hoges
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    A left field worst case scenario... carbon fouling of valve stems



    http://www.robisonservice.com/servic...n_fouling1.pdf

    http://www.robisonservice.com/servic...n_fouling2.pdf



    It's worth a read...even if to positively rule it out as a cause...
    MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
    2020 Subaru Impreza S ('SWMBO's Express' )
    2023 Ineos Grenadier Trialmaster (diesel)
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  8. 9th September 2012, 03:47 PM #8
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    PeterH
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    Thanks fellas, I'll try the maf sensor cleaner, sounds like a much easier start than pulling the heads off! I'm away for a couple of weeks, will do that when I get back and let you know the results. I hope that's all it is.
    Cheers, Pete.
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  9. 10th September 2012, 10:40 PM #9
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    PaulP38a
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    I just use Isopropyl Alcohol from JayCar to clean mine... think it was someone here that recommended it a few years ago.
    Is it any better or worse than MAF Cleaner?
    My toys, projects and write-ups at PaulP38a.com
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  10. 27th September 2012, 11:49 AM #10
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    PeterH
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    Bit of an update for you, I tried the crc maf sensor cleaner, now running much smoother.
    It's probably one of those things that gradually gets worse over time, so you don't really notice it until it gets bad enough.
    What a difference, the idle is perfect, runs beautifully.
    Still noticing some hesitation accelerating uphill though.
    Will have to check the ignition leads next I guess.
    Cheers, Pete.
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