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Old 27th February 2021, 14:46   #1
Kenneth Smith
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Red face Rover 75 mis-firing

Hi Everyone, still got mis - firing on my 2003 Rover 75 1.8 Turbo. Some days are better than others. Worst especially around 2000 to 3000 rpm. Once when I refilled with fuel it corrected itself. It has corrected itself several times but the problem comes back. Any ideas. Regards Ken
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Old 27th February 2021, 15:03   #2
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A few things can cause a mis-fire, inlet manifold gasket leak, plug gap too big, hole in a hose, coil pack.
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Old 27th February 2021, 15:54   #3
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From my own experience with a 1.8t- i always consider the coil packs and leads with a random multiple misfire as the first port of call.
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Old 27th February 2021, 17:36   #4
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Check the vacuum hoses from the turbo.
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Old 27th February 2021, 22:50   #5
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You say it corrected itself when you re-fuelled it.--How long did it last before the fuel level dropped to the point where it started to misfire again ??
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Old 1st March 2021, 12:04   #6
Kenneth Smith
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Hi, thanks everyone for replies. From memory I think it was ok for several refills then problem came back. Car not used a lot now and only short journeys.Refills were about half a tank each time.Regards Ken

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Old 1st March 2021, 12:22   #7
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Another possibility Kenneth is the onset of fuel filter separation which reduces fuel delivery pressure.

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Old 3rd March 2021, 01:22   #8
Kenneth Smith
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Hi, can the fuel filter be changed without special tools? Thanks Ken
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Old 3rd March 2021, 08:50   #9
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Quote:
Originally Posted by Kenneth Smith View Post
Hi Everyone, still got mis - firing on my 2003 Rover 75 1.8 Turbo. Some days are better than others. Worst especially around 2000 to 3000 rpm. Once when I refilled with fuel it corrected itself. It has corrected itself several times but the problem comes back. Any ideas. Regards Ken

The symptoms you describe sound like potential turbo over boost, which will cause the engine to hesitate and miss fire before continuing . This will happen more under load and wide open throttle and may be the reason why the issue seems intermittent. As planenut said check your turbo control hoses for any splits or loose fittings , Also check the waste gate for operation as the have been known to seize .

Last edited by TourerSteve; 3rd March 2021 at 10:52..
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Old 3rd March 2021, 10:38   #10
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Plug leads are known to deteriorate where they attach to the plugs and also the carbon ribbon in the leads can break down. Any moisture on the leads then leads to spark tracking to earth by the shortest route (ie to the head). This can often be seen as sparks jumping in the dark.
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