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Thread: Vectra 1.8 Mass Air Flow (MAF) Question

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    VIP-Member puppet's Avatar
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    Vehicle : Insignia 1.8 SRi

    Trim : VX Line Red

    Engine : 1.8VVT

    Year : 2011

    Default Vectra 1.8 Mass Air Flow (MAF) Question

    Hi guys. recently bought a Vectra C, and am having a small problem that I wondered if you could help with at all.

    It's a 2002 1.8LS with a Z18XE engine in it. A couple of days ago the engine management light came on, and using the method to extract the code from blinks of the EML light, it comes up with 0170, which according to the code lists is :

    P0170 Fuel Trim Malfunction (Bank 1)

    I had a bit of a poke about, and nothing obvious seemed to be loose etc, so I thought I would leave the battery disconnected overnight to try and reset the light, and then see if it just came back on again. Having had a full night disconnected, the light remained lit though. I have today taken the throttle body off and given it a good clean with carb cleaner, and put in a fresh set of spark plugs.

    My question is this though - with the engine running, I can disconnect the multiplug from the MAF meter, and the engine doesn't so much as blink an eye. It sits and idles fine, and seems to rev quite happily as usual. I would have thought disconnecting it would have had at least some effect? Given that the battery being disconnected overnight didn't put the EML out, and now the MAF being unplugged seeming to have no effect, would that point towards there being a fault with the MAF? Can anybody confirm what effect unplugging the MAF has on their engine?

    Before the EML came on, I would have said the only unusual thing I had noticed that it had perhaps been running a little lumpy when cold. A few minutes driving and it seemed to be absolutely as per normal.

    Cheers.

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    Just tryed it on my 1.8 (Z18XER) for you and exactly the same, nothing happens. I knoe its a different engine but I think they are pretty simular and the function of the MAF sensor is surely the same?

    It won't start without it in though??

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    Vehicle : Insignia 1.8 SRi

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    Default

    Quote Originally Posted by mucklestone View Post
    Just tryed it on my 1.8 (Z18XER) for you and exactly the same, nothing happens. I knoe its a different engine but I think they are pretty simular and the function of the MAF sensor is surely the same?

    It won't start without it in though??
    Top man, thanks for doing that. Haven't actually tried turning it off with it disconnected and restarting it, will have a go at that shortly and report back.

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    My first thoughts are lambda sensor

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    Quote Originally Posted by puppet View Post
    Top man, thanks for doing that. Haven't actually tried turning it off with it disconnected and restarting it, will have a go at that shortly and report back.
    Starts without the MAF connected, although perhaps a tad lumpy.

    @dh.dti - Any reason you suspect the lambda sensor, have you had experience of similar?

    Assume if the battery being disconnected overnight didn't reset the EML, then I will have to use a reader to do so instead?

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    Default

    Okay, I think I may be able to beg/steal/borrow a MAF from a friend of a friend to see if it helps. If that doesn't help I'll likely try a new Lambda sensor on the manifold.

    I should hopefully be able to tell fairly quickly if the fault has gone, but was considering buying an OP COM to reset the light. I will likely buy another Vectra after this one, so it would be a worthwhile investment anyway.

    Before I buy one, can anybody here tell me if there is anything to be aware of when buying an OP COM? I am assuming the pyhsical OP COM connectors should be all the same, and the lead would fit onto the connector I have shown, located under the ash-tray in the centre console?

    Thanks for any help.

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    Ok chaps, wondering if you can offer any further advice on this one.

    The P0170 fault was persisting, so I changed the Lambda sensor on the exhaust manifold. I also had ordered an OP COM in the meantime, so when that arrived a couple of days later I hooked that up for a bit of a look. (Bit of faffing required tro get it working on 1.39!)

    I can see the two bank 1 lamda sensors, however they appear to be working differently :

    B1S1 (Bank 1 Sensor 1?) - This "flip flops" between Rich and Lean, which is what I assume it should be doing.

    B1S2 (Bank 1 Sensor 2?) - This just sits at a constant Rich.

    Would this point towards Sensor 2 actually being faulty? Where axactly is the second sensor fitted on the vectra out of interest?

    Thanks.

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    Default any news on this guys

    i have exactly the same problem if anybody knows how to fix this issue with the 1.8 engines please let us know.

    I have stripped the Throttle Body and cleaned it thoroughly.
    Made a bit of a improvement to the response but if you try to floor the car in say 3rd 4th or 5th there are so called flat spots were there is a lack of power almost like the fuel mixture is incorrect (flooding)

    Also noticed in cold weather its very lumpy

    Any help appreciated

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    Vehicle : vectra sri 150


    Engine : 1900 cdti 150

    Year : 2008

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    po170 will be the air flow meter common on z18xe whats performance like is it a bit sluggish they are about 80 quid i think from dealer

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    Default

    Thanks for replying guys.

    andyvec18 - It does indeed sound like you have a similar problem to myself. Car does seem just generally down on power, and runs pretty poor for about the 1st 1/4 mile or so in the morning.

    paul wingnut - I am going to manage to get my hands on a 2nd hand air flow meter later this week. I'll sling it in and report back with the outcome.

    Fingers crossed.


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