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Vauxhall combo 2003, EGR and MAP and MAF sensor cleaning

Discussion in 'Car Repairs / Maintenance' started by burts, 3 Feb 2016.

  1. burts

    burts

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    So, I had a previous post about some error codes on the van regarding barometer and pressures, cant exactly remember what.

    I have a series of questions here. I purchased an EGR aerosol that states it is ok for air flow sensor and air intake. I changed the air filter and at the same time sprayed the mass air flow valve/sensor with this spray. Ran the van and the rev counter at idle sits just below 1, is that normal? never took notice before but assumed it sat at zero?

    I have a Haynes manual(seems to make everything more complicated) is a charge pressure sensor, Boost sensor and MAP sensor all the same thing? Where is this located and how do I clean it? Also where is the EGR valve and how do I access that and clean it?

    Book makes it sound far too complicated.

    I also have an opcom, when I run an output test, the van engine speed goes to 1,350.....
    What should the EGR pulse ratio be? Mass air flow sensor? and Injection quantity be??

    long post I know. Sorry
     
  2. Burnerman

    Burnerman

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    The MAF sensor is in the intake pipe, and it is a thin wire that can measure the air flow into the engine. It's different from the MAP sensor which is a plastic box with a tube that measures manifold air pressure, rather than air flow.
    Both of these devices need to be clean - the MAF sensor is particularly delicate.
    The EGR valve is located in the inlet manifold, and connecting to it is a convoluted metal pipe, around 20mm dia. This has to be unbolted for cleaning.....check out a google pic of it so you know what you are dealing with?
    Other info refers to the turbo boost pressure I guess.
    The engine should idle around 900 rpm when warm.
    John :)
     
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  4. burts

    burts

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    Thanks john, you seem to be the only one who ever replies on here. It's my own van so it's not like I'm trying to make money messing about with people's motors.
    I'm aware the MAF is delicate and located in the air intake next to the air filter housing. I removed the tee junction and have it a good fee shirt burst sprays which I believe should have cleaned it.

    I will u tube the egr and map sensor. Before fittkng the air filter and spraying MAF sensor I'm sure my rev counter idled at 0.... Or am I making that up

    Also, any info in what the readings should be when I run the output test? Egr ratio? Air mass flow and injection?
     
  5. Burnerman

    Burnerman

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    I'm not at all qualified to comment on the likes of injector pulse and duration, I'm afraid....this is really the prerogative of the manufacturer and rarely of our concern.
    However, you've done the good thing with the flow meter ( just try disconnecting it to see if the engine revs change) and the real culprit with all diesels is the cursed EGR. You'll find the thing coked up with carbon and oil grot, and they become so stiff to operate that the vacuum that moves the thing can't cope.
    So, if you can clean or replace that I think it would be time well spent!
    As for the rev counter, I do suspect that it has always registered as I've never had one fail like this - or at least it hasn't started working again.....but that's only my thoughts.
    Sorry I can't be more help I'm afraid.....anything further is going to need a diesel specialist, I fear but for another comment, do check that any vacuum pipes around the turbo area are intact.
    John :)
     
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