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Engine reving up by itself.

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  • 27-08-2008 10:25am
    #1
    Woody_FX
    Registered Users Posts: 215 ✭✭


    I've noticed over the last 2 weeks as i drove down the canal at 5mph on my way to work that the car would jump forward at times. Like i stood on the accelerator for a second. I can see the rev counter jump a little. I've also noticed the temperature gage flicks around. Anybody have an idea whats going on? I dont think its the temperature since i am only traveling short distances, buy maybe an electrics problem? Or maybe those 2 things are completely unrelated.

    Its a 2002 Disesl Avensis btw.

    Anybody able to shed some light on what the problem maybe?

    Thanks
    -Woody


Comments

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    #2
    emagination
    Registered Users Posts: 32 ✭emagination


    Could it be air-conditioning kicking in? Does it happen with air-con switched off?


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    #3
    voxpop
    Registered Users Posts: 2,800 ✭✭✭voxpop


    Sound like you have a faulty temperature sender anyway


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    #4
    mike65
    Closed Accounts Posts: 88,978 ✭✭✭✭mike65


    Could have an airbox contaminated with deisel/oil residue I think that can cause revving as the mix is enriched.

    Mike


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    #5
    maceocc2
    Registered Users Posts: 443 ✭✭maceocc2


    mike65 wrote: »
    Could have an airbox contaminated with deisel/oil residue I think that can cause revving as the mix is enriched.

    Mike

    I would say the same alright, or faulty air intake valve could be the problem, meaning air to diesel mix is wrong


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    #6
    DublinDilbert
    Registered Users Posts: 5,379 ✭✭✭DublinDilbert


    voxpop wrote: »
    Sound like you have a faulty temperature sender anyway

    I would assume extra fuel would be injected if it thinks the engine is cold also, so that might account for the fluctuation in revs.

    Typically they use an NTC thermistor who's resistance will increase as the temperature drops, hence an open circuit will be read as a cold value... If the sensor is going "fully open circuit", this should be logged by the engine ECU as a fault. It could be intermittently going open circuit, hence the ECU may well think its ok...


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    #7
    antodeco
    Registered Users, Subscribers Posts: 13,512 ✭✭✭✭antodeco


    mike65 wrote: »
    Could have an airbox contaminated with deisel/oil residue I think that can cause revving as the mix is enriched.

    Mike

    +1 Defo sounds like an air intake issue.


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    #8
    Woody_FX
    Registered Users Posts: 215 ✭✭Woody_FX


    Hmm can i clean that myself without having any tools or would it be a job for my local mechanic?

    Problem seems to be more pronounced lately (or could be just that i am noticing it more).


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    #9
    dainius
    Registered Users Posts: 45 ✭dainius


    have you checked the coolant level? Does your heater work properly? Last time it happen to me I blew the head gasket.


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    #10
    JimmyCrackCorn!
    Closed Accounts Posts: 752 ✭✭✭JimmyCrackCorn!


    cheak for any leaking breather pipes aswell


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    #11
    gobby
    Registered Users Posts: 1,253 ✭✭✭gobby


    Ouch, you dont wanna blow the HG. Mechanic time methinks


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