Check engine sign?

[entrepreneur177]

Oh my god....I'm starting to be concerned about reliability of BMW....

A have already changed my HPFP after check engine came up almost a year ago, after several visits to the dealer.

Now I have another trouble. On the speed of 45 mph i've heard a knocking sound (1 sec) in the BACK of my car! Nothing else happened. Then i opened a full thorttle and the yellow check engine sign came up, acceleration slowed down and my exhaust started to sould twice louder and with deeper tone, just like a tunned mustang. I immediately stopped engine and tried to start it again - the check engine sign was still there, but the exhaust and acceleration was fine. I tried to open a full thorttle again and a hard metallic sound "kicked" in the back of the car again. Still have a check engine sign and I wonder if some of you guys might know what it possibly could be? I wonder how would be cracking sound in the back can be related to check engine... And those are 100% related issues.

z4 35i, DCT

Now I need to take my JB4 out and get a car to the dealer, but anyway I want to try to figure out what happened and why?

I was not abusing the car at all and it have never seen track or any kind of racing whatsoever.

However, I really loved how the car sounded at those moments! ) Fantastic!

[STOOF]

I think i had this issue before, I floored it and the CEL came on, i shut it off and restarted it real quick and was still there, felt very sluggish.

I immediately put JB4 to Map 0.

I was on my way to a meet so the car sat for a few hrs, by the time i went to leave the light was gone and I never saw it again.

So see if the CEL is still on in the morning, if so get the torx wrench out lol

[az34]

i think JB4 is part of your problem, and may be THE problem.

[entrepreneur177]

Originally Posted by STOOF

I think i had this issue before, I floored it and the CEL came on, i shut it off and restarted it real quick and was still there, felt very sluggish.

I immediately put JB4 to Map 0.

I was on my way to a meet so the car sat for a few hrs, by the time i went to leave the light was gone and I never saw it again.

So see if the CEL is still on in the morning, if so get the torx wrench out lol

CEL is still there....car behaves as usual, but i have not tried to push it hard today. Did you haeve that metal hit sound in the back of the car as well?

Originally Posted by az34

i think JB4 is part of your problem, and may be THE problem.

Might be, but I'm now think if it could be related to BOV....

[entrepreneur177]

WTF....misfire cylinder 3....

[z4z4z4]

Originally Posted by entrepreneur177

WTF....misfire cylinder 3....

Time for new plugs!
http://www.n54tech.com/forums/showthread.php?t=14936