High RPM Miss/Sputter

[epj3]

thatd be awesome if you got a direct answer/fix, i was maybe thinking pre cat O2 and maybe knock sensors...but idk. my car is considerably slower with all this i feel like its pulling timing and knocking, and i kno i have good gas so some sensors not keeping up or simply isnt good anymore...thats my thoughts at least.

Nah, no way a pre-cat O2 sensor could do it. That WOULD definitely throw a code if it were getting bad enough of a reading to effect performance.

Odd thing is my car hasn't ALWAYS done it, just started about 10 months ago

[pioneer416]

Nah, no way a pre-cat O2 sensor could do it. That WOULD definitely throw a code if it were getting bad enough of a reading to effect performance.

Odd thing is my car hasn't ALWAYS done it, just started about 10 months ago

my car started doin it this summer, its really starting to piss me off now, i just want it to run smooth

[epj3]

my car started doin it this summer, its really starting to piss me off now, i just want it to run smooth

Haha I hear ya, my car is nice and smooth all the other times, its just the one or two momentary "dips" in power up top before redline.

Oh well, one more reason to go with a standalone and turbo

[Bimmerforums]

Seems like a pretty common problem, i'm surprised no one has came up with a solution..

[ProwlerGT]

Seems like a pretty common problem, i'm surprised no one has came up with a solution..

I wish I had a BMW to be posting here, but I'm here because many of the people on 3SI.org have the same problem except at a different RPM range 2600 - 2800 or 2800-3000 depending on the outside temp. The problem has illuded MANY for years with people trying everything ya'll have mentioned in this thread. The problem with today's world is that no one wants to retroactively post the fix once it occurs... I hope that whoever resolves this on ya'll platform posts the fix and that it can help me and my buds on 3SI.org too.

[M3Rob95]

Im waiting for the answer :P

[douglee25]

Im waiting for the answer :P

On page 1 there should be a post of mine that lists possible items that I'm considering on trying. Hopefully that should help.

Doug

[Balthazarr]

I think one component that is overlooked too often is the IAT.
I would imagine that the miss would be present at idle too, but worth checking, anyway.

[Bimmerforums]

I think one component that is overlooked too often is the IAT.
I would imagine that the miss would be present at idle too, but worth checking, anyway.

Actually one of my friends who manages a shop said it could be the coolant temperature sensor (well in my case at least). Lately in the cold my car hasn't suffered the high RPM misfires and is running like a dream.

[Balthazarr]

Actually one of my friends who manages a shop said it could be the coolant air temperature sensor (well in my case at least). Lately in the cold my car hasn't suffered the high RPM misfires and is running like a dream.

No such thing.
Either the intake air temp or coolant temp.

[Bimmerforums]

which is the same thing as the coolant temperature sensor

[fatboycowen]

Subscribed: Same problem here. Doesnt stumble every time. Probably 1 of 4 times. Usually the higher gears. Been doing this over a year now.

[M3Rob95]

Yea mine was running excellent all day then just a minute ago it was doing it again!!

Of course only in 3rd gear +


Just ordered a new intake boot (mine has cracks, none of which appear to go all the way through) and a fuel filter. Also got some oem bmw front rotors, control arms and bushings..

I doubt the suspension stuff will help

Anyways Ill post up how it is after the boot and filter..

If nothing from those, im moving on to ignition..

Thanks for the support bf.c, I hope we figure this out!

[Balthazarr]

which is the same thing as the coolant temperature sensor

Right.
Try to find a Coolant AIR temp sensor.

[ultimachi]

My next step is crank and cam position sensors...

That would be my guess. My car began doing that, and finally the cam sensor went out and was bucking at around 6,000 rpm in any gear.

[M3Rob95]

mine starts at 3.5k and goes up to 6.5k..

can not notice it too bad in 1st or 2nd...

[douglee25]

All interesting replies. I'm still deciding what to do next. I'll probably clean the MAF and check the fuel pressure (didn't have time last weekend).

Doug

[M3Rob95]

Mine finally threw a code!!

It was a misfire in cylinder 3..

I pulled the coil from cylinder 3 and swapped it with cylinder 4s.

If it the coil then the next CEL will be misfire in cylinder 4...

If it is still in cylinder 3 then it could be a plug or something else..

Ill let yall know

[M3Rob95]

Update:

So for however many miles i have been driving, it is running way better..

Still no codes but I bet one will come.. If not that was to easy... almost tooooo easy

[porschec2turbo]

yeah i have the same problem... i really need to figure out whats going on with my car...

[porschec2turbo]

has no one really figured this one out?

[Julz69]

Hopefully someone does. I to have the same problem.

[TheM3nsah]

Subscribed: Same problem here. Doesnt stumble every time. Probably 1 of 4 times. Usually the higher gears. Been doing this over a year now.

+1

[Balthazarr]

Try flexing the harness near the coils.
I don't mean try to break it; do it gently.

[porschec2turbo]

well i am just going to replace all my coils since i am around 90k... and if it goes away then i will know what the problem was.. haha if not i will be pretty upset