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Thread: engine on idle

  1. #1
    Regular Member The Gas Man's Avatar
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    Default engine on idle

    i have a problem with my 1.8 , when the engine is on idle the revs go from about 500 to 750 constanly up and down , the lights and interior dash display also go brighter and dimmer, any thoughts

  2. #2
    Regular Member chris1804's Avatar
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    idle valve?

  3. #3
    Regular Member The Gas Man's Avatar
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    thanks mate, so what is an idle valve and can i do it my self, does it need cleaning or is a replacement part needed,

  4. #4
    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

    Engine : 3.2 V6

    Year : 04

    Mileage : 000

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    Air control Valve. Do you have one on the side of the throttle body. It might need cleaning or even replacing. I am not too familier with the 1.8 vec C. But if it is like the 1.8 vec B. Then if there are some small holes on the inside of the throttle body you could try spraying some carb cleaner onto them. I used to have to do this on the wifes Vec B. It worked for a while. But in the end. I had to replace the air control valve, as a spring inside becomes weak and will not work proporly.

  5. #5
    Regular Member The Gas Man's Avatar
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    thanks ed, i will have to have a look in the morning mate, not sure were the throttle body is will have to check the haynes manual

  6. #6
    Ex Vec-C Admin ed taylor's Avatar
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    Vehicle : Vectra Estate

    Trim : Elite

    Engine : 3.2 V6

    Year : 04

    Mileage : 000

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    Quote Originally Posted by The Gas Man View Post
    thanks ed, i will have to have a look in the morning mate, not sure were the throttle body is will have to check the haynes manual
    The throttle body is the "thing" that the air intake pipe from the air filter box is conected to. It is basicly the inlet manifold. Try doing a search for " air control valve".

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    Regular Member The Gas Man's Avatar
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    cheers ed still not had a chance to look though

  8. #8
    Regular Member The Gas Man's Avatar
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    got some carb cleaner gonna give it a go tomorow

  9. #9
    Regular Member carl bear's Avatar
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    if that doesnt work , could be the EGR valve (if you have one, some 1.8's do, some dont).

    Mine was runnin slightly rough at idle turned out to be the egr valve.

  10. #10
    Regular Member barkzz's Avatar
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    Quote Originally Posted by carl bear View Post
    if that doesnt work , could be the EGR valve (if you have one, some 1.8's do, some dont).

    Mine was runnin slightly rough at idle turned out to be the egr valve.
    1.8 with an EGR???

    Really? On a petrol? I've never heard of them having one, but i could be wrong, if so i stand corrected

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