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Thread: Rev's rising/falling slightly? DMF Related?

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    Regular Member DTK0902's Avatar
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    Default Rev's rising/falling slightly? DMF Related?

    Hi all,
    New on here as of today, picked up the car last night and all was well for a while. Brought it home and was nearly home sitting in traffic at the lights, next thing heard this rattle coming from the car sounded up near my feet. Had a look at the rev's and it was rising and falling slightly? Im pretty sure the DMF is starting to go, typical symptoms with a bit of vibration up near the top of the clutch pedal, that's all going to be sorted this week.

    What I am more worried about is the way the revs are rising and falling? anyone any ideas, its only rising slightly maybe not even 100/200 revs but something isn't right there.

    Any help would be much appreciated.

    Regards,
    Daniel

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    Air conditioning compressor turning on and off can cause that - was it turned on?

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    The flywheels can get really bad,had mine stall the engine twice and that was enough for me to get mine replaced,they can get so bad where they can ruin the crankshaft.

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    Check alternator

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    Is your car diesel with dpf? Cause everytime my car starts regen the dpf, revs will hunt like that at idle. Also the engine feels a bit rough.

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    Regular Member DTK0902's Avatar
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    Quote Originally Posted by marko1966 View Post
    The flywheels can get really bad,had mine stall the engine twice and that was enough for me to get mine replaced,they can get so bad where they can ruin the crankshaft.
    Hopefully the clutch and DMF change will sort it then, still under dealer warranty so may get it done and save my £££

    Quote Originally Posted by cont1204 View Post
    Air conditioning compressor turning on and off can cause that - was it turned on?
    AirCon wasn't switched on at the time.

    Quote Originally Posted by troutybrown View Post
    Check alternator
    If alternator was going would it not flicker the lights exterior and interior like the old astra we had? Worth a check though!

    Quote Originally Posted by dibar74 View Post
    Is your car diesel with dpf? Cause everytime my car starts regen the dpf, revs will hunt like that at idle. Also the engine feels a bit rough.
    Don't know if its the DPF one, its a pre facelift 2005 reg. Any way of checking? Engine feels smooth enough.

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    If alternator was going would it not flicker the lights exterior and interior like the old astra we had? Worth a check though!


    Not all the time.

    If ECU sees low voltage it ups idle to compensate then when ok lowers to normal hence fluctuation

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    Regular Member DTK0902's Avatar
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    Quote Originally Posted by troutybrown View Post
    Not all the time.

    If ECU sees low voltage it ups idle to compensate then when ok lowers to normal hence fluctuation
    Thanks for that, Is there any way to check Alternator voltage?

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    Put a multimeter across battery terminals with engine running should be around 14 volts

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