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Thread: Backfires and Holds Back In Top Gears, Flat Out.

  
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    D4nnyGsi's Avatar
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    Question Backfires and Holds Back In Top Gears, Flat Out.

    Right guys i was on a private road driving the car hard tonight and at top end in 4th then MORE in 5th the car held back big time and was spitting flames out the back

    I let off the throttle and when i went to apply it it was really flat (no throttle response) until i bought the revs down to about 4000rpm.

    It doesn't do it in any other gears so im puzzled with the problem

    I re-gapped the Iridiums to 0.75mm, Is this correct??

    I think it is a misfire but im not 100% sure as i thought it would do it in all gears.

    Just hope it isn't gonna fail my engine with it like this.

    Normal fast road driving its not a problem, only when its at top power and high gears!!!

    Cheers for any input guys

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    GR888's Avatar
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    Turn off the engine and lightly spray clean MAF sensor with an electronic and electrical contact cleaner, halfords sell a good one(yellow can, green top) in direction of airflow. Also clean the sensor just after the intercooler.
    This is the first port of call as its cheap.

    I do mine every month or so.

    Hope you get it sorted.

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    Iv just put a new AFM on it matey, And the map newish as well.

    Im gonna gap the plugs to 0.70mm and try that.

    Are NGK BKR5EIX (i think thats them) good enough or do i need 6's or 7's????

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    what fuel you running? i had an issue with v power not long ago, exact same as you
    GSi

    Built not Bought

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    Yeah im using v power mate, always have, you reckon try tesco super then???

    Iv just gapped my plugs to 0.65mm but not driven it hard yet.

    Think my plugs are getting lazy as they're about year and half old so gonna try either cossy plugs or NGK 6's.

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    Quote Originally Posted by D4nnyGsi View Post
    Yeah im using v power mate, always have, you reckon try tesco super then???

    Iv just gapped my plugs to 0.65mm but not driven it hard yet.

    Think my plugs are getting lazy as they're about year and half old so gonna try either cossy plugs or NGK 6's.
    plugs have good life spans on em. try cleaning cam/crankshaft sensors

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    aye mate happend to me a few times, now i run tesco 99 and its never happend since, im running a standard car bar exhaust aswell!
    GSi

    Built not Bought

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    sounds like coilpack going down under load mate.

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    i had this with a collins DV. it was leaking boost, only noticed at high revs in 4th or 5th. it was horrible on the motorway.
    Astra T9 estate for sale, see my ebay link!

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    I know plugs have a long life span but on a turbo'd car they do take a bit more of a beating.

    Great not the collins dump valve lol.

    Im sure its either plugs or coil pack though.

    Cheers for the input guys.

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