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  #1  
Old 01-25-2016, 06:30 PM
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Location: Liverpool, United Kingdom
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ne0beatsm0rp98 is on a distinguished road
e53 2002 misfire over 4000rpm or high speeds

Hey everyone, new member so hi

Anyway i have a 2002 e53 petrol automatic.
If i floor it over 3,500-4000 rpm the engine management light comes on and the car shudders with low power. If i stop and restart engine it goes back to normal but obviously same issue arises if i go abover 3,5000rpm.
Also on motorways even if i stay below 3,5000rpm and say i hit 70mph and hit a slight incline the engine management light comes on and same issue again, need to pull over and restart car.

On a diagnostic it comes up as 1 & 3 cylinder misfire.

Now its been into a bmw specialist and they had it 2 weeks now. They replaced all the usual, sparks, coil pack, fuel filter, o2 sensors, checked for pressure leaks.

Finally after spending 650 on different jobs to get to this point, there claiming that previous owner has removed the two cats, so if the two cats get refitted at a cost of around 500 it should resolve the issue.

Now im on here because after speaking to numerous other garages, they are claiming it wont resolve the issue as removal of the cats wont cause limp mode as removal of cats increases power which people do all the time.

After reading around, a few different suggestions have come up including the head gasket needing resealing.
So my question is has anyone else come across this issue? If so any ideas on how to repair it or what it could be? Just seems that different places have different views on what it is to repair it.

Thanks
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  #2  
Old 01-26-2016, 07:27 AM
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I would put a fuel pump replacement on the short list.

But having more data like EOBD Freeze Frame information would be helpful.

Cylinder 1 and 3 are not in sequential firing order, so would doubt you have a head gasket problem, but you would have other symptoms as well if the head gasket was a problem.

I would also say clogged/restricted catalytic converters could be a problem, but you stated they were removed. Do you know this 100% for sure? It is possible that you think the converters have been removed. Spark plug inspection would have given a good idea as to what was going on.

Seem like you should get your own OBDII tool and gather data rather than rely on the shops.

Less than $30-$40 USD you should be able to get OBDFusion and an interface for your smart phone/tablet.
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Old 02-02-2016, 10:10 AM
sew sew is offline
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Is this a straight 6 or the V8? I have had something not dissimilar on my V8 which apparently now (after 2.5 years and many thousands of ) is fixed. As I found out to my cost, there are many, many things that can cause these symptoms and the diagnostics don't help a great deal, in fact they can be utterly misleading. It's a pity you're not nearer becuase (if yours is a V8) a have a garage loft full of parts that were changed but weren't the cause of the problems!
I tend to agree with you that it's not likely to be the cats, but to be honest I don't know what the effects are of taking them off so I can't comment. My car is completely standard M62.
Let us know how you're getting on and I'll contribute what I can to the discussion.
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Old 02-07-2016, 07:28 PM
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I had these symptoms and after a year of looking into things it turned out I had spark plugs which burned too hot (even though they were considered to acceptable for this vehicle by their manufacturer). This is something small to verify.
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Old 02-07-2016, 10:05 PM
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I had similar on a 4.6is. Flooring it would cause a misfire, the cel would flash a bit, and stored misfire code. It was a coil though. But it looks like you already tried that.
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