e36 m3 - HELP!!!

Been running it a couple of day without the sensor connected and it was fine, reconnected it and its running flat again.

Agree with the top end power loss though, and I'm sure it is running too rich up there.  Its quite an interesting dilemma.  you'd think that with a decent air filter, the throttles balanced properly (I drove a 3L that this had just been done on and it was a flying machine) and a chip to remap this apparent fuelling problem, it would be sorted. 

I wonder if it is worth speaking to a chipping company to see if they have done any chips to the 3.0L.....be interesting to find out....thing is who to trust??

As everyone seems to in it for the green stuff these days!!

"Of course sir we will remove all the flat spots give you 20hp more" err that will be £600!

biffa wrote: Might be right about the running lean thing.  I had the airflow sensor disconnected (simply unscrew the plug on the box on the rhs of the engine).  It richens everything up and now the problem is virtually gone.  I actually have power below 2500 rpm!!!!! Anyone else with the problem want to try it and let me know what its like.  Don't know what its going to do to the fuel consumption though, but who cares!

Hey Biffa,

That isnt a good idea mate....the airsensor is there for a reason. Also it will show as a fault on the DME now....

Interesting you say it improves it?? I guess the ECU would go to limp mode and use base settings....

I was wondering about documenting this thread and sending it to the tech team at BMW and see what they make of it???

mine drops the same as the evo if not more, but mine seems 2 b making more torque than it, but surely the evo should have more, it sits an idles not a problem don't matter how cold it is in the morning's not a problem there, its jus that annoying flat spot wen u drive easy, but wen u drive it hard u never notice it, mine has a magnex backbox an a k&n airfilter. wish i new wot u could do bout it, its jus a joke the way they all do it but no1, including bm don't no how 2 fix it,

Yep Mine Does it....

On mine I have had New O2 sensors, New Coils, Plugs, Valves adjusted, 3 lots of injector cleaner.....I had a new ECU as it had no output to 1 of the O2 sensors but I aint gonna go there as thats another story!

I use mine everyday....it is a nightmare car as an everyday motor....it is getting more liveable now the weather is warming up cos the engine runs a bit better as it warms up quicker. But when it was 0C-4C it would sit on tickover and splutter dropping cylinders....LOL it would even make the car shake it's booty. Bit embarrassing on the type of car it is. The only way to drive the M3 is to drive it flat out all the time.....problem is I cant do that as the traffic round my way wont allow it....I end up listening to me tunes whilst stuck in traffic.

I had my motor put on the dyno this week and the dip showed up on the dyno....happens when you hit 2200-2500rpm then it clears itself and is fine up to the readline. This is on the Evo that came with me but his was slightly worse. Unfortunately I dont have a scanner so I cant put mine up but you get the idea.Top curve is torque and the bottom line is power

You can also check out the thread cos I mention it in there.

http://www.bmwcarclubgb.co.uk/forum/forum_posts.asp?TID=6673&PN=1

Tristan

Tried that a couple of times already, but no improvement.  Thanks anyway.  with my luck, it isn't going to be a cheap solution!!  Assuming it can be solved that is.

Brett

Might try that, but I've also heard that the throttle position sensor can cause prolems with flat spots, but who knows!  Its funny that in all the stuff I read about them before I bought it, none of them mentioned anything about this problem.  Dam!

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