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  #31  
Old 08-10-2013, 08:11 AM
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Quote:
Originally Posted by pezho405 View Post
You should try to swap coils to different places, then see if that cylinder begins to have a problem
Thanks for your advice
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  
Old 08-10-2013, 08:36 AM
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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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  #33  
Old 08-10-2013, 08:48 AM
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Quote:
Originally Posted by Aman View Post
Thanks for your advice
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?
Perhaps an intake manifold leak on that side of the engine.
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  #34  
Old 08-10-2013, 09:34 AM
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Quote:
Originally Posted by nyum96 View Post
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.
Hi did you have the rattle like the one in the video I posted? (its on page 2 I think)
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  #35  
Old 08-10-2013, 11:57 AM
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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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Last edited by bcredliner; 08-10-2013 at 12:02 PM.
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  #36  
Old 08-10-2013, 12:12 PM
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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  
Old 08-10-2013, 12:15 PM
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I had bizarre seemingly unrelated codes also. Misfires on #8 and such.
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  #38  
Old 08-10-2013, 12:23 PM
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Quote:
Originally Posted by sethhatfield View Post
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.
Thanks for your input.
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
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  #39  
Old 08-10-2013, 12:34 PM
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Quote:
Originally Posted by bcredliner View Post
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
Thanks for your help
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...
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  #40  
Old 08-10-2013, 12:40 PM
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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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