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Thread: Rough idle after battery disconnected?

  1. 10th July 2021, 03:55 PM #1
    shayne86 Guest

    Rough idle after battery disconnected?

    Had the battery discontented for a few hours the other day. Now the car has a very rough idle. Is this normal?

    Car starts fine and runs fine for about the first 15-20 seconds then sounds like its got a lumpy cam. Responds ok-ish when driving but feels a little hesitant.
    Nothing like it was yesterday before i had the battery disconnected.
    Is a v8 for reference. 2004 model.

    Anyone come across this before?
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  2. 10th July 2021, 05:54 PM #2
    shayne86 Guest
    Tried to run it with the MAF plug disconnected and it idles fine!

    Surely it can't be a bad maf sensor, this one is only 4 months old?
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  3. 10th July 2021, 05:57 PM #3
    shayne86 Guest
    For reference i disconnected the battery only. Nothing else was touched under the bonnet so couldn't have damaged anything or knocked anything like the MAF. Weird
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  4. 10th July 2021, 05:59 PM #4
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    V8Ian
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    Is the MAF genuine or aftermarket?
    If you don't like trucks, stop buying stuff.
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  5. 10th July 2021, 06:02 PM #5
    shayne86 Guest
    Quote Originally Posted by V8Ian View Post
    Is the MAF genuine or aftermarket?
    Not too sure to be honest mate. Its a Bosch unit from a reputable supplier here in Perth. Not an ebay item.
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  6. 10th July 2021, 07:28 PM #6
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    V8Ian
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    Bosch should be OK.
    If you don't like trucks, stop buying stuff.
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  7. 10th July 2021, 07:42 PM #7
    shayne86 Guest
    Quote Originally Posted by V8Ian View Post
    Bosch should be OK.
    That's what i thought. Hence why I'm so confused
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  8. 11th July 2021, 12:50 AM #8
    shayne86 Guest
    So ive cleared a code through my obd2 reader and seems to be back to normal. Will see how it goes in the morning
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  9. 11th July 2021, 01:26 PM #9
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    Bohica
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    What was the code?
    D2a Td5 Manual, Chawton White. aka "Daisy"
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  10. 11th July 2021, 09:32 PM #10
    shayne86 Guest
    Quote Originally Posted by Bohica View Post
    What was the code?
    Can't remember. Something about voltage to maf low.
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