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Thread: 3.2 v6 wont go past 4k

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    Default 3.2 v6 wont go past 4k

    Currently have a issue with my 3.2 and its getting the better of me!

    Car will run fine on idle maybe a little lumpy at times but have found out this is quite normal on these engines, rev fine til 4k then it stops and just gives out a deep induction rawr. I believe its stuck in limp home mode and is restricting the revs

    If i clear the fault codes it revs up past 4k for a second then drops slowly back to 3 or 4k and sits there.

    The fault codes that came up were

    p0302 - cylinder 2 misfire
    p0304 - cylinder 4 misfire
    p0306 - cylinder 6 misfire

    Replaced the coil pack and plugs on the front bank as i thought it was that judging by the fault codes but the problem is still there and exactly the same.

    It doesnt sound like a misfire more like the engine is chocking itselfs. car runs the same with the MAF unplugged, have cleaned out the throttle butterfly and checked all hoses for leaks and found nothing. Dont think the timing has jumped a tooth as it runs fine until it hits that 4k revs.

    Guessing it could be a partly bloked cat?

    Any suggestions what to check or test next would be great, thanks in advance!

  2. #2
    Regular Member gtr1000's Avatar
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    Vehicle : Insignia

    Trim : Sri

    Engine : 140 Ecoflex S/S

    Year : 2013

    Default

    Shot in the dark here, as you've run without the MAF and it makes no difference, either try cleaning the MAF or replacing it? I'd have thought that without the MAF connected you'd get another fault code as well. Pre-cat or lambda sensor on the front downpipe might also be a quick looksee but I ain't no expert on this.

    How many miles has the motor done? Mine's at 67k and runs as smooth as silk.

    Interesting this one, keep us posted mate.

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    Regular Member poves's Avatar
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    I had this once in my 3.2 , and a plastic bag had been sucked into the air filter housing , which was restricting airflow.

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    Regular Member gromit's Avatar
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    Had a similar fault with mine but it was cylinder 1, 3 and 5 on mine and no other fault codes. only started when it was wet weather but cleared itself after a day or two. Might be moisture in one of the electrical connections.

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    Do those engines still have the "Dual Ram" thing from the older V6? It's like the V6 version of twinport and the system on the VVT where the inlet tract length changes depending on the revs? Could be whatever flaps control that are jammed?

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    Thanks for all the replys, cleaned up everything i could think of but didnt help, all the filter housing is free and not blocked, took the top cover off the plenum seen the flappy things (very techy!) they seems to move ok without problems.. I dont think its the lambda sensors playing up, live data shows them switching correctly with correct voltages

    Time to spray everything with WD40

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    Regular Member marcdale's Avatar
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    Did you get to the bottom of this?

    Those 'flappy things' you mention are actually held closed by a vacuum, so it's very possible that they move perfectly well, but if they are not closing properly you would get more air through that expected. The diaphram's may have torn inside the housing units where the vacuum hoses connect to it.

    To test while you've got it appart you should pull one of the vacuum hoses off the diaphram unit, then push the flaps closed with your hand then while your holding it closed, put your finger over the hole where the vacuum pipe connected up and then release the flaps. Your other finger should prevent the vacuum loss and they should stay closed until you remove your finger.

    In between the two diaphram housings there is a control unit for the vacuum to both diaphrams, with the engine running if you pull the vacuum pipe off the end of the control unit you should hear a very noticable pressure release. If you do not, you've likely got a leak some where above the inlet manifold. if you do hear a release of pressure and your diaphrams seem to hold vacuum, then it's likely to be the control unit. it's got two vacuum pipes going to it and an electrical plug - which triggers the release of the vacuum when your floor it. If this control is not working your flaps won't open.

    You can more or less recreate the problem by simply unplugging this control unit

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