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Thread: low idle concerns

  1. 26th October 2010, 09:52 PM #1
    theface26
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    low idle concerns

    hey all,

    in the past two weeks, my TDI has had a few dramas with my idle levels and i'd like to hunt down where this issue is coming from so i can (ideally) fix it myself. Being fresh to engine issues with these bad boys (always played with little petrols in the past), looking for some humble guidance.

    after making a trip from rocky out to moura QLD, 160 odd ks, i pulled up at work and the idle kicked far below the usual 700ish. Turned her off and found the problem wasnt there after a few hours.

    over the last 2 weeks though, its returned now to be full time. I find when it is cold, or air con is engaged, the idle doesn't hold at the usual level, rather dropping down to about 600 then up to 700 and back and forth. to date i've just been barely touching the pedel to keep her stable at the 700 mark which works quite fine. again, when she's up to temperature and no aircon, seems to sit there no real issues.

    ive been nursing her until yesterday to finally get some time to start investigating where this problem to lie, with about all i can find in searching under idle issues is injectors U/S.

    beyond services, identifying i need a fresh set of engine & tranny mounts and replacing the vac pump about 8 months ago, i haven't had much need to get the head under the bonnet. not sure if that's useful to the problem, but thought it may offer something just in case.

    would appreciate a start point for where to look, what to test etc as i've got the RAVE manual, but can't seem to find much troubleshooting guidance through it, so hopefully i can get it here.

    appreciate any help in advance,

    Al
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  2. 27th October 2010, 08:26 AM #2
    bee utey's Avatar
    bee utey
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    Diesel or petrol?
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  3. 27th October 2010, 03:31 PM #3
    theface26
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    Quote Originally Posted by bee utey View Post
    Diesel or petrol?

    couldve swore i wrote that in.. might use my glasses next time.. updated to show its the TDI, 1997 model champ
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  4. 29th October 2010, 12:54 PM #4
    theface26
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    hey guys, anyone able to provide some assistance please?
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  5. 29th October 2010, 01:06 PM #5
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    brianwood
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    Not sure if your model has an idle control solenoid, but my '95 tdi doesn't. When the A/C pump cycles on, the revs drop to around 600, then back up to 700 ish when it cycles off.
    Check your accelerator cable has adequate free play and adjust your idle speed adjustment to around 700-750 with the a/c off.
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  6. 31st October 2010, 12:03 AM #6
    theface26
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    Will do bud, thanks for the starter.. Anymore suggestions others can offer to this little troubleshooting exercise?
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  7. 31st October 2010, 11:57 AM #7
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    Quote Originally Posted by theface26 View Post
    Will do bud, thanks for the starter.. Anymore suggestions others can offer to this little troubleshooting exercise?
    Idle screw on the injector pump needs adjusting? I don't own a diesel but I'm sure there's adjustment at the pump where the accel cable connects. Usually with a lock nut. Come loose?
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  8. 5th November 2010, 12:47 PM #8
    theface26
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    Guys, I've checked idle and she sits clean on 750 when the AC is off..

    Can this be something internal? Injector on the fritz, blow by on the cylinders?
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  9. 5th November 2010, 02:07 PM #9
    ade's Avatar
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    check for delamination in your intercooler hoses
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  10. 6th November 2010, 06:43 PM #10
    theface26
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    Ade, just so I can understand, what affect would this be happening?
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