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Thread: P0301 & P0304 misfire

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    Default P0301 & P0304 misfire

    Car is running terrible, wont go past 2500rpm, no power and then limphome. Z18XE engine on 2003 car. Codes are P0301 - cyl.1 misfire detected and P0304 - cyl.4 misfire detected. Changed the plugs and substituted a known good coilpack, no change. There is a low oil level warning up but there is plenty of oil in sump. Any help would be appreciated.

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    Ex Vec-C Admin Deztroyer's Avatar
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    hmmm if there is a low oil level warning its there for a reason = either sensor failure OR indeed for low oil

    is there any other faults present?

    how HAS the car been driving and what was happening just BEFORE the engine light came on ? has it been running poorly for a while or only just started?

    maybe a harness issue somewhere ??

    0-Large smile ......every time it's driven

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    Has been running poorly for a couple of days before this happened. Have had spurious oil level warnings before and put it down to sensor error, wouldn't have thought this would trigger limp home mode. Believe sometimes crank/cam sensor, maf sensor errors do not always register faults?? No other fault codes. Think you could be right with wiring issue.

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    Now have fault code P1482 cooling fan speed output circuit. Tried disconnecting battery for an hour, no difference. Also tried disconnecting the maf sensor so that ecu uses default value, running should improve slightly if maf faulty - no change. Also noted that the temp is 90 deg instead of usual 85 deg.

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    i really belive with ALL of the associated issues faults that are appearing that there is a wiring issue somewhere either a water ingress or a chaffing somewhere

    0-Large smile ......every time it's driven

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    Sorted - HURRAY. After fitting plugs, coilpack, cam sensor, crank sensor, position 1 O2 sensor and checking timing, turned out to be collapsed/blocked cat. Expensive episode.

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    Regular Member Kyser143's Avatar
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    Quote Originally Posted by tridley View Post
    Sorted - HURRAY. After fitting plugs, coilpack, cam sensor, crank sensor, position 1 O2 sensor and checking timing, turned out to be collapsed/blocked cat. Expensive episode.
    Hi mate I seem to have a very similar prob mine is also a 1.8 and in limp mode gives me cylinder 1 misfire changed plugs coilpack and camsensor so far but no luck. How did you clear the prob o0fn collapsed/blocked cat? many thanks

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    Had to change the cat, cost £320. If it's the cat you will notice reduced flow from tailpipe and my engine ran much hotter.

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    Cheers will get that checked aswell did Notice a reduced flow but with engine shaking on idle thought that would be the reason but will get the cat checked out thnx

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    Vehicle : Bmw 330d

    Trim : Msport

    Engine : 3.0d

    Year : 2008

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    low fuel pressure if not said will cause issues

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