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Thread: More missfires!

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    Regular Member SRI-150's Avatar
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    Default More missfires!

    This is on my Dad's V6:
    The car always has had a dodgy missfire but couldn't figure out why it happened it was very random.
    I recently had some trouble where one of the hoses split and was missfiring and running sh** until i spotted it, so once replaced i thought maybe this was the cause of the the other missfire... well no it wasn't and its now getting worse.

    So had a good look today and when you rev it to about 3k rpm then shut off throttle it makes a sound like a dump valve but it goes about 3 or 4 times i've traced it to the air intake, its as if the turbo is pushing the compressed air back through the intake system??

    Can anyone help? / Tell me whats happening lol

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    Full Member GazVXLINE170's Avatar
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    Petrol or Diesel? If petrol could be a dodgy dump valve (although it's not one that dumps air into the atmosphere but dumps it into the exhaust side of the turbo to reduce lag).

    Diesel - could be the EGR valve or throttle plate.

    What hose was it? Was it one of the smaller ones or one of the larger air intake ones?
    Insignia VX-Line Nav CDTI 170.

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    Regular Member Critch's Avatar
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    I'd agree with the above their is a field rememdy of the diesel engines for this I'm sure of it

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    Regular Member SRI-150's Avatar
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    Default

    Yeh its the 3.0 diesel facelift.
    It was a biggish hose the one that comes up from the intercooler to the turbo on the right side of the engine.

    It boost ok just when you let off it lets this fart out the intake lol. same when driving, if your booting it it's ok just when your trying to get up to speed slowly (partial throttle which does point towards the EGR, just thought that the EGR wouldn't cause the back pressure through the intake)

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    Full Member GazVXLINE170's Avatar
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    Sounds more like a split intercooler to me if it's the noise i think it is.
    Insignia VX-Line Nav CDTI 170.

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    Regular Member SRI-150's Avatar
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    Wouldn't that cause problems when on boost? as the compressed air would be leaking then not when coming off boost?

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    Regular Member gtr1000's Avatar
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    Yep, there is a field remedy for the EGR which entails updated ECU software. Not sure if it applies to the Z30DT but certainly applies up to the 2004 Y30DT and maybe other later years.

    Is the sound like a "steam train whoosh"? This is what VX describe it as in TIS2000. They go onto say that the remedy is only applicable to autos, god knows why, but I had the update done anyway. Yes, the update did make a slight difference but I've almost eliminated the whooshing by using a blanking plate with 2 x 8mm holes between the EGR and inlet mainfold. This proves to me that it's the EGR or something closely associated with it and, until I get the EGR off, I'll live with it. None of us know, and indeed most garages don't either, is how things like the MAF, MAP, EGR, turbo, boost solenoid etc., interact with each other on the 3.0 V6 - it ain't as straightforward as all the other VX diesels.

    My whoosh/chattering was most apparent when changing gear - on the power in first, dip clutch, lift off throttle and then whoosh, whoosh, whoosh until you selected the next gear and reapplied the gas. Would happen at any road speed, any revs but always always on lightish throttle openings.

    HTH

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    Full Member GazVXLINE170's Avatar
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    Quote Originally Posted by SRI-150 View Post
    Wouldn't that cause problems when on boost? as the compressed air would be leaking then not when coming off boost?

    Was going by the noise you described. By the sounds of what others are saying, looking like the EGR is causing an issue.
    Insignia VX-Line Nav CDTI 170.

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    Default

    Check the intercooler sounds very much like mine did when mine was split

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