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Thread: D1 won't rev

  1. 27th April 2014, 05:53 PM #1
    Phwoah Guest

    D1 won't rev

    Hi guys brought a 3.9 93 model disco and it will idle fine but when I put some revs on it gets a misfire and sounds to be back firing through air box as it gets a nasty pop with a couple revs. I have replaced plugs and leads, fuel filter etc and helps a little but still doing it. Am new to disco's and this forum so any help would be greatly appreciated
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  2. 27th April 2014, 07:59 PM #2
    Gary S11's Avatar
    Gary S11
    Gary S11 is offline Master
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    Check your timing, they like 10btdc ...if still popping maybe compression test...might? Be burnt inlet valve ...gotta start some where..at least then you'd have an idea of motor cond, Gary
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  3. 27th April 2014, 08:04 PM #3
    Phwoah Guest
    Thanks mate will get a timing light on it and check compression
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  4. 29th April 2014, 07:30 PM #4
    98discovery
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    Just a thought but check your exhaust system isn't crushed somewhere.I had a similar issue with my old RR when I purchased it and was surprised to find that was the problem.
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  5. 30th April 2014, 09:12 AM #5
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    Kevin B
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    Check the voltage on the MAF as well and give it a clean, also the TPS (throttle position sensor) mine was a bit like that, adjusted the voltage on each and it ran a lot better, mine is a 3.5 93 mod but much the same
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  6. 30th April 2014, 09:16 AM #6
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    Scouse
    Scouse is offline OldBushie Gold Subscriber
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    Low fuel pressure might be the culprit too.
    Scott
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