E60 530d Boost/misfire/fluctuation problems. Help please!
Discussion
I had similar symptoms on my E39 530d which is probably similar enough to be worth considering. I could not find anything wrong with my MAF, when I was checking through other sensors that could control the turbo vanes I checked the MAP sensor that is at the back of the intake manifold. When I removed it the opening in the sensor was totally gunked up with black goo. I cleaned it out with brake cleaner and the problem was gone, I have done 40k since and a similar problem returned about 20k later but more pronounced with a much more significant lack of power, which eventually ended up with a total no start situation. This turned out to be the fuel pump that lives under the car on the passenger side. I replaced that too and that has been perfect since.
Thought I'd share an update on this, as most threads end up unanswered when the problem is fixed!
Basically I had 3 problems:
1) 70mph misfire occasionally - I finally found some info about adjusting the EGR to eliminate this problem so pointed at th EGR being potentially to blame for it all
2) Boost fluctuation at around 2000rpm on partial acceleration - Again potentially MAF/EGR related
3) Poor response - Car often wanted to downshift unecessarily for extra revs, and on accelerator being pressed there was lag.
Another symptom as a result of this strange behaviour was the shifts being a bit firm.
So I unplugged the MAF and it fixed the symptoms, but as it runs in default mode wasn't necessarily the cause.
I then unplugged the EGR and again fixed the symptoms but may not have been the issue.
I'd had the swirl flaps removed so knew they weren't to blame.
Sooo....
Today, I had the remap done - accompanied with an EGR delete - And, it's fixed it. Basically the EGR is to blame but I couldn't be certain without the car having an engine fault removed.
Smooth acceleration, better shifts, responsivenss is epic (obviously even better with the remap). I will add my EGR was spotless, but it's the pressure converter I believe is to blame.
Couldn't be happier, what a result as it only cost me the remap!
Basically I had 3 problems:
1) 70mph misfire occasionally - I finally found some info about adjusting the EGR to eliminate this problem so pointed at th EGR being potentially to blame for it all
2) Boost fluctuation at around 2000rpm on partial acceleration - Again potentially MAF/EGR related
3) Poor response - Car often wanted to downshift unecessarily for extra revs, and on accelerator being pressed there was lag.
Another symptom as a result of this strange behaviour was the shifts being a bit firm.
So I unplugged the MAF and it fixed the symptoms, but as it runs in default mode wasn't necessarily the cause.
I then unplugged the EGR and again fixed the symptoms but may not have been the issue.
I'd had the swirl flaps removed so knew they weren't to blame.
Sooo....
Today, I had the remap done - accompanied with an EGR delete - And, it's fixed it. Basically the EGR is to blame but I couldn't be certain without the car having an engine fault removed.
Smooth acceleration, better shifts, responsivenss is epic (obviously even better with the remap). I will add my EGR was spotless, but it's the pressure converter I believe is to blame.
Couldn't be happier, what a result as it only cost me the remap!
I've been chasing a similar issue on my 2005 E61 530d - I wanted to add that a lot of folks on here: http://www.bimmerfest.com/forums/showthread.php?t=... are talking about an additive called "instant shudder fix" which seems to do exactly what it says on the tin (tube). I have ordered a couple of tubes and will be trying myself after having flushed and refilled the gearbox to no avail last week.
Gassing Station | BMW General | Top of Page | What's New | My Stuff