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Thread: wierd tacho behaviour TD5 auto...

  1. 16th March 2013, 05:38 PM #1
    Alex 110's Avatar
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    wierd tacho behaviour TD5 auto...

    At speeds of around 80-90, in fourth under load, the tacho needle is continually hunting up & down by around 100-300rpm.
    I've attached a short video of the dashboard while this is happening so you can see what I see.
    It only does it in 4th. the next time I drove the same route with the same load as when I took the video I set the auto to "Sport" so it kicked down to 3rd (& around 3500rpm) at the point where in 4th this was occurring, and the hunting didn't happen.
    Its not the MAF as its brand new - what else do I need to look at?
    TIA
    Alex
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  2. 16th March 2013, 06:12 PM #2
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    wierd tacho behaviour TD5 auto...

    Are the revs actually hunting or is it purely a issue with what the tachometer is displaying. You'd probably want to use a diagnostic tool to monitor the revs the ECU is outputting. That would narrow down the issue to either ecu or instrument panel.
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  3. 16th March 2013, 07:14 PM #3
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    Long shot, but given its at just over 80 km in 4th - could it be related to the lockout?
    D4 MY16 TDV6 - Cambo towing magic, Traxide Batteries, X Lifter, GAP ID Tool, Snorkel, Mitch Hitch, Clearview Mirrors, F&R Dashcams, CB
    RRC MY95 LSE Vogue Softdash "Bessie" with MY99 TD5 and 4HP24 transplants
    SADLY SOLD MY04 D2a TD5 auto and MY10 D4 2.7 both with lots of goodies
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  4. 16th March 2013, 07:33 PM #4
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    Quote Originally Posted by OffTrack View Post
    Are the revs actually hunting or is it purely a issue with what the tachometer is displaying. You'd probably want to use a diagnostic tool to monitor the revs the ECU is outputting. That would narrow down the issue to either ecu or instrument panel.
    Without easy access to a nanocom or similar all I can say is that it feels down on power & hesitant when it happens which makes me think the tacho is reading true & the revs really are doing something strange
    Alex
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  5. 17th March 2013, 10:15 AM #5
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    Quote Originally Posted by gavinwibrow View Post
    Long shot, but given its at just over 80 km in 4th - could it be related to the lockout?
    do you mean the torque converter lock?
    If so, this could be it - if the torque converter was locking & unlocking over & over again?
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  6. 17th March 2013, 11:18 AM #6
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    Quote Originally Posted by Alex 110 View Post
    do you mean the torque converter lock?
    If so, this could be it - if the torque converter was locking & unlocking over & over again?
    Yep - that's what I'm querying. Good luck!
    D4 MY16 TDV6 - Cambo towing magic, Traxide Batteries, X Lifter, GAP ID Tool, Snorkel, Mitch Hitch, Clearview Mirrors, F&R Dashcams, CB
    RRC MY95 LSE Vogue Softdash "Bessie" with MY99 TD5 and 4HP24 transplants
    SADLY SOLD MY04 D2a TD5 auto and MY10 D4 2.7 both with lots of goodies
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  7. 17th March 2013, 11:25 AM #7
    boldy
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    boldy

    Hi, have a look at the connections on the back of your alternator, that what was cauing the problem on mine
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