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#31
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The cylinders which had misfire (5,6,8) had new coils fitted. 24 hours later there was codes for misfire of cylinder 6 and 8, which suggests the coils are not the problem I notice that the misfire is all on one side of the v8 engine - I'm not sure if this is just a coincidence? |
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#32
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Had the exact same problem, even with the new coils.
Finish changing all of them out. Started with 6, jumped to 7, then to 8, finally jumped to the other bank. Someone can correct me if I am wrong but there are 2 phases to the coil. Phase one can but tested but phase 2 (WOT) can not. Worth a search.
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1973 - Porsche 914 1.7 Stock - Sold (sad day) 2001-VW Beetle 1.8t Modified (200HP) - Lost my "man card" 2002 - X5 4.6is - Stock - Got my "man card" back |
#33
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD |
#34
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#35
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Bad cat will cause will throw weird engine codes. The previous bad coils were likely not burning the fuel, if they were even bad, which would contribute to a cat fail. Cats will rattle when they are shot and will be intermittent. Trace the rattle to the source. Bad cat restricts exhaust so engine will only rev so high as the engine can't suck in more air because it isn't getting out.
If they say a coil(s) are shot I would ask that they test the coils by moving a good one around and see if the faults move to other cylinders before buying new coils. I do like to change all the coils when one goes bad--but I am one that never wants to risk losing any amount of performance. Now that it is missing at idle it should be easier to pinpoint the cause As per Pezho and Aman
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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior Dallas Last edited by bcredliner; 08-10-2013 at 12:02 PM. |
#36
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It's the catalytic converters are clogged and broken apart inside their shells. I had the same problem and had mine replaced with a pair of universals for $364 and I got all the power back. I wouldn't rev past 4000 rpm when flooring it. The muffler guy cut them off and chunks of crap fell out of them.
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#37
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I had bizarre seemingly unrelated codes also. Misfires on #8 and such.
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#38
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Did you have the rattle like the one in my video on page 2? Do you have a 4.6 too? What made you suspect the cats rather than coils etc? Many thanks for your help |
#39
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After I took the car to the garage again today they reset the engine management light Now when the car idles there is no misfire again It seems me making the car go to 4000 rpm causes a misfire at approx rpm, if I do it enough times the EML stays on and the misfire stays, until the EML is reset... so it seems... |
#40
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I had a rattle but the material was so crammed in there by the end it stopped and was plugging up the exhaust. Yours is probably moving around in there still which is why it gets better occasionally. Mine is a 4.4 but I doubt the cats are different. My engine has 130,000 so we're not far apart.
I knew the coils wasn't it because I swapped them and the misfire stayed put. I also swapped plugs around. I'm afraid it will come back after the crap in them blocks the exhaust again. |
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4.6, engine, hesitation, rattle |
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