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Thread: Car is being a jerk

  
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    france100's Avatar
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    Car is being a jerk

    Okay this problem is really starting to annoy me now as I've spent money on the car with no result!

    Symptoms:
    - Press on throttle = kick in the back
    - Foot off the throttle = jerky back and forth
    - At low revs the car begins to jerk
    - When clutch is in, no symtoms at all. Smooth as silk

    At first I assumed this was the load on the engine made worse by a bad engine mount. I replaced this yesterday, but the problem is still there.

    A lot of people say it could be the EGR valve, but I doubt that as the EGR valve also causes other symptoms like stalling. My car doesn't ever stall.

    Please help!!
    Diamond Black Astra G 1.8 Sport

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    nry's Avatar
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    What engine do you have? The later Z18XE engines don't have an EGR valve, but the earlier X18's do.

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    Oh sorry forgot to mention it's an X18XE1
    Diamond Black Astra G 1.8 Sport

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    Could be various possibilities..

    -Spark Plug change - if they're caked in carbon affects the response of the throttle, happened in my old saxo

    -Fuel filter clogged?

    -Throttle body - common culprit, needs taking off and thoroughly cleaning with a cloth and some petrol

    -Air filter - have you changed it recently?

    - Lambda - Could be running too lean/rich

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    - Spark plugs will be checked in next few days
    - Same with fuel filter
    - Throttle body cleaned with carb cleaner
    - Air filter is clean enough for the time being
    - Lambda sensor was a problem, but I cleaned it with meth spirit and now seems to be running fine with no error codes coming up.
    Diamond Black Astra G 1.8 Sport

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    Usually the best way to clean the tb is to remove it completely from the engine and do it, as the other side of the butterfly is virtually impossible to clean like that. Also it reduces the chance of any crud falling down there which could lead to more problems.

    Iv never really heard good things about carb cleaner tbh.

    Mine recently played up slightly but that was due to the thermostat being faulty which led to cooling issues etc. Replaced that and back to being good again.

    EDIT: Best to just change the fuel filter completely mate. Its only a few quid, and takes 10 minutes to fit.

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    I'm checking the spark plugs now, just waiting for my dad to get home with the tools

    Also, I cleaned the throttle body really well I think. The carb cleaner is great and makes it so much easier to get the dirt off and make it all nice and clean, but I'll take it off tomorrow or something and clean it.

    If neither of these work, then I'll change the fuel filter.
    Diamond Black Astra G 1.8 Sport

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    Just checked spark plugs, they're fine. Gave them a clean with the spark plug cleaner and the car pulls a little better now. But the car still jerks the same as before.
    Inspected the throttle body too, it's clean. Even behind the butterfly as I wedged it open with a screwdriver and cleaned it thoroughly.

    Before:



    After:




    Seems that the last option is the fuel filter. If that doesn't work I'll have a go at blanking the EGR valve, but I seriously doubt it's that.

    If anyone has any other suggestions, feel free to tell me!
    Diamond Black Astra G 1.8 Sport

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    lee gsi's Avatar
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    What about the coil pack?
    The truth is always the truth even if you haven't realised it yet...

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    People reporting coil pack problems seem to have some pretty severe symptoms like misfiring but my car doesn't suffer from that, so I doubt it's that, but thanks anyway
    Diamond Black Astra G 1.8 Sport

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