Newbie needs a hand!

Discussion in '5 Series' started by Smiffo, Jun 9, 2019.

  1. Smiffo
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    Smiffo

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    Hi all, recently upgraded from e39 to e60. I purchased it with a fault, and the guy (very straight and helpful) said the problem was with the heater plug relay, which I replaced this morning with a new unit. The fault is still there.

    The actual fault is- start the car (530D auto) . If you Rev it to 1500 and hold it when stationary, the engine will miss suddenly, then bounce back to normal - without the fault re-occurring until it has been switched off for a while.
    Similarly, if you drive off from cold, the same issue happens at 1500 revs. A quick splutter and back to normal, so not a gearbox issue! (?)

    He assured me the code reader his Indy gave him, suggested the heat plug relay. I put a new relay in this morning but fault still there. Would the fault still occur after replacement with a brand new one, without having the codes cleared?

    Any help would be great. Incidentally- relay is a bum to do, but managed it without removing inlet manifold.
    Cheers
    Smiffo.
     
    Last edited: Jun 12, 2019
  2. Alan Gunn
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    Alan Gunn

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    Glow plugs and controller are normally done together but i don't think they are your problem as it's a lumpy cold start they cause.
    A code scan on bmw scanning software would be my first as you could end up throwing loads of your hard earned at it and still have the fault.
    One thing you could try is unplugging the MAF and see how it runs.
     
  3. Smiffo
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    Smiffo

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    Cheers. I'll give that a go. Probably due for a clean anyway. (96k miles).
     
  4. Smiffo
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    Smiffo

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    Cleaned and checked connectors. Fault still there. Bummer!
     
  5. K777
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    K777 WARLORD Site Supporter

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    disconnect MAF and drive Alan means, see if makes a difference. If it runs better its the MAF.
    If not ? Vacuum leak maybe ?
     

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