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Thread: Still got an annoying misfire.

  1. #1
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    Default Still got an annoying misfire.

    05 Vectra Sri 150.
    When the cars started from cold it runs lumpy for 30 seconds or so, it with then drive fine until it gets up to operating temperature then I have an annoying misfire which seems to happen below 2000 rpm when pottering about. When giving it beans it drives fine.
    So far I have changed number 1 and 3 injector plugs, cleaned out egr valve and boost sensor ran 2 tanks of injector and egr valve cleaner through it and a can of 10k boost.

    It's showing no fault codes on my cheap code reader or the garages snap on code reader, last night tho I went out in it and it wouldn't rev above 3.5k, after switching it off then back on again it was fine and again no codes. There was no warning light on while it was in limp mode.

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    Regular Member kman247's Avatar
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    had a similar issue until this weekend , changed egr valve and cleaned boost sensor , i was getting slight hesitation at about 1800RPM , now runs fine and even feels like its pulling more. Maybe the pulling bit is a placebo effect , but hesitation is definately gone.

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    Regular Member Dan_BlackSRi's Avatar
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    Temporarily blank the EGR to rule this out completely.

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    To temporarily blank the EGR, simply disconnect the electrical connector (have to assume that the EGR valve is actually closing correctly). If the EGR valve is indeed closing correctly, then disconnecting the electrical supply to it will have the same effect as blanking it.

    I run my car with it disconnected at all times apart from MOT day.

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    Thanks for the replies, I will disconnect the egr tonight and see what happens.

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    Regular Member Dan_BlackSRi's Avatar
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    Quote Originally Posted by wickedwillie View Post
    To temporarily blank the EGR, simply disconnect the electrical connector (have to assume that the EGR valve is actually closing correctly). If the EGR valve is indeed closing correctly, then disconnecting the electrical supply to it will have the same effect as blanking it.

    I run my car with it disconnected at all times apart from MOT day.
    The common problem with EGR's is that they do not seal properly, so unplugging it may have no effect in this instance.

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    Maybe so but an easy thing to try. In the majority of cases it will close. It is the time to close properly that may be slow and that is why you get problems when driving as the valve is supposed to follow instantly (or as close to this as possible) the voltage levels at its terminals.

    I also whacked the EGR valve with a rubber mallet a few times to help the valve find its natural rest position with engine idling.

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    Regular Member Dan_BlackSRi's Avatar
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    Quote Originally Posted by wickedwillie View Post
    I also whacked the EGR valve with a rubber mallet a few times to help the valve find its natural rest position with engine idling.
    That's a good idea, they need that every now and again

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    Woo hoo!
    I unplugged the egr valve tonight and just been for a half hour drive and it never faultered once.
    Is there any negative effects caused by running it with the egr unplugged?

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    All sorted now thanks to wickedwillie.
    It was the solenoid on the egr valve sticking so I stripped it down, lubed it and rebuilt, car now runs perfect.

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