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Another misfire issue - I promise I read the other threads

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Old 12-18-2018, 01:44 AM
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Originally Posted by E60Japanese
I repaired a 2008 525i once that had a constant miss at starting.
The BMW shop had put new injectors and coils and plugs and it was okay for a few weeks and then the missing slowly returned
I had just bought a set of oxygen sensors for my car and thought I would fit them to check.

It fixed the problem and it's been a few years now.
I'm not saying you wouldn't have. A faulty plug or coil but I personally have not had problems with injectors causing a miss at starting and have seen it more during acceleration
I'll pull the plugs some morning to check what the previous poster mentioned, but I'm interested in the O2 sensors. Did you replace both banks pre and post cat?
Old 12-19-2018, 02:47 AM
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At first I fitted only the top two banks as it is usually what goes first because they get hotter and burn out faster.
After fitting them the miss had gone.
I drove it around for a few days and it was still running fine.
My friend said he would pay for the four if I could put them in so I did.
There was no change so I suspect it was one of the two top ones.
That reminds me that he never actually paid me for them either lololol
Please ask if I can be of any more help
Old 02-05-2019, 10:58 AM
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Just wanted to update for anyone who searches this later on.

Ended up taking it in to and Indy shop and they wanted 3400 to do injectors, walnut blast and fix an oil leak in the oil filter housing.

I ended up having them do the walnut blast and oil leak and brought it home. It drove fine for 2 days and started missing again. I ordered injectors from Summit Racing (#smp-fj1284) for a little over 600 and did it myself. It was very easy to do and everything is working great now! Didn't have to touch the o2 sensors or anything else.
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