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Thread: MAF sensor

  1. #1
    Regular Member ONEMINUTESILENCE's Avatar
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    Default MAF sensor

    Hi all,

    I recently bought my cdti 150 & have since noticed a slight hesitation at 1800 rpm, everyone believed this would be the MAF sensor as it has been serviced regularly.

    I unplugged the sensor tonight as my EML came on this morning & goes off when you start the car. Anyway to cut a long story short when it was unplugged i seemed to loose all power it was like driving a wheelbarrow. Is this normal?

    Does anyone have a good technique/advice on how to clean the MAF?

    Regards

  2. #2
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    Vehicle : CDTI 150

    Trim : Design

    Engine : Z19DTH

    Year : 2005

    Default

    Best way to clean MAF is with a solvent that leaves no residue, electrical contact cleaner, Iso Propyl alcohol or the stuff photograpers use to clean lenses. Spray on in direction of air flow, shake off excess. Ensure its dry before refitting.
    However looking at the year of your car the following Vx field remedy may be of assistance. Essentially if its not had a recent software update you can get problems as described.

    Field Remedy: 1849
    Subject: Engine Z19DT/H - Jerking
    Models: Engines: Option:
    Vectra-C 2004...2005,Signum 2004...2005 Z19DT| Z19DTH,Z19DT| Z19DTH
    Complaint: Customer complains about a kind of jerking at steady state or at slight acceleration.
    Cause: The problem is caused by high EGR-rate in combination with component tolerances.
    Production:

    Remedy:
    In case of customer complaint reprogram the ECU with new software as of TIS 2000-CD, Version 67.
    If the problem occurs with the new software again, contact ETAC for further information.
    Please note:
    A replacement of any parts (injectors, high-pressure pump, EGR valve, ECU, etc.)is not necessary.
    FunctionalGroup: J - Engine
    Complaint Group: 18 - Poor Drivebility
    Trouble Code: None

  3. #3
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    Default

    if you unplug MAF, then it will not be able to measure air flow entering the intercooler and on to the engine and will default to limp mode i guess - not had the problem - but guess thats what it would do.

    you need a functioning MAF and MAP in order to make sure the ecu can compare what is going on.

    if either are faulty / dirty you will get poor running as the ecu cannot reconcile the differences in incoming data

    to clean

    soak the MAF in pure alcohol ( no water ) overnight. make sure electrical contact kept out of solution.


    let it dry then refit and bobs your uncle

    cheers


  4. #4
    Regular Member ONEMINUTESILENCE's Avatar
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    Quote Originally Posted by lesj View Post
    Best way to clean MAF is with a solvent that leaves no residue, electrical contact cleaner, Iso Propyl alcohol or the stuff photograpers use to clean lenses. Spray on in direction of air flow, shake off excess. Ensure its dry before refitting.
    However looking at the year of your car the following Vx field remedy may be of assistance. Essentially if its not had a recent software update you can get problems as described.

    Field Remedy: 1849
    Subject: Engine Z19DT/H - Jerking
    Models: Engines: Option:
    Vectra-C 2004...2005,Signum 2004...2005 Z19DT| Z19DTH,Z19DT| Z19DTH
    Complaint: Customer complains about a kind of jerking at steady state or at slight acceleration.
    Cause: The problem is caused by high EGR-rate in combination with component tolerances.
    Production:

    Remedy:
    In case of customer complaint reprogram the ECU with new software as of TIS 2000-CD, Version 67.
    If the problem occurs with the new software again, contact ETAC for further information.
    Please note:
    A replacement of any parts (injectors, high-pressure pump, EGR valve, ECU, etc.)is not necessary.
    FunctionalGroup: J - Engine
    Complaint Group: 18 - Poor Drivebility
    Trouble Code: None
    What sort of cost would it be to get a map update at the dealers?

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    Default

    I spoke to the stealers yesterday and they said an hours labour so it would be £75!!!! I recently had a new egr fitted as mine was juddering at low speed, so will try n get it done under the warranty!!

  6. #6
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    Vehicle : CDTI 150

    Trim : Design

    Engine : Z19DTH

    Year : 2005

    Default

    My loal dealer (Greenhous Telford) has quoted £60 for an update

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