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Thread: TD5 Rough running at cold start

  1. 27th April 2012, 01:05 PM #1
    crash
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    TD5 Rough running at cold start

    When I go to start the Disco (270K)first thing in the morning it has a bit of a rough idle for a minute and then runs fine for the rest of the day. Warm up starts it does not do it, worse at colder temps.
    This am tried to start had a rough idle then stopped, I could not restart it. No warning lights and cranks well, can hear fuel pump running, has fuel. Will retry when I get home and see what happens.
    I do run injector cleaner through it on a semi regular basis.
    1) will recheck to see if oil in loom
    2) could a dirty MAF cause this - will clean and see.
    3) injector problem?
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  2. 27th April 2012, 03:33 PM #2
    stallie
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    Mine is doing the same (the brief rough running - about 5 seconds and worse when cold).

    Research I have done on here suggests that could be the IAT sensor or more likely it could be a leaking copper ring on the injector.

    I am having it looked at next week.
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  3. 27th April 2012, 04:40 PM #3
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    OffTrack
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    You could add these to the list of suspects:

    - Fuel Temp sensor
    - Coolant Sensor
    - Crank Shaft Position sensor

    The MAP/IAT is unlikely to cause starting issues.
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  4. 27th April 2012, 04:53 PM #4
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    landiematt
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    Could also be a faulty fuel injection leaking down after sitting for awhile. Over fueling for initial start-up.
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  5. 27th April 2012, 06:13 PM #5
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    robbotd5
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    Glow plug fault??
    Regards
    Robbo
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  6. 27th April 2012, 07:19 PM #6
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    Psimpson7
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    is there any excessive smoke of any colour when it runs rough?
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  7. 27th April 2012, 08:11 PM #7
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    dinosaur
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    I was always led to believe that the rough running on startup was due to the fact that the diesel only had 4 glowplugs and that it was the cold 5th cylinder 'rattling' around until it got its act together.
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  8. 27th April 2012, 08:53 PM #8
    stallie
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    Mines only just started doing it. Didn't do it last winter.
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  9. 28th April 2012, 11:01 AM #9
    crash
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    Quote Originally Posted by Psimpson7 View Post
    is there any excessive smoke of any colour when it runs rough?
    Not that I have noticed.
    Yesterday It failed to start after it quit - 1st time this happened.
    Tried to restart but would just crank over.
    This am - thinking maybe a fuel pump issue, I went through the process of a restart as if run out of fuel - had a bit of a rough start but had alot of black smoke for a couple of minutes but has been normal since.
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  10. 28th April 2012, 09:09 PM #10
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    gusthedog
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    My rough idle at intial start up was fixed by putting in a new injector harness. Im not sure about all the other stuff tho.....
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