[RonRed89]

Guys,

Just had a weird one happen to me today. Car is an 09 E92 335 X-Drive 6MT car. Was driving and noticed that the car was significantly down on power. In other words, it might take 10 or more seconds to pull from 60-80MPH in 6th gear. This happens pretty quickly under normal conditions (stock).

What I am surprised about is that the car threw no codes. It seemed to feel as if the turbos weren't boosting at all, but without a BT, I can't really verify that. The car did not buck, shake or make any other indication of any issues other than perhaps driving like a 150HP 335xi instead of a 300HP one.

Following the car sitting in the parking garage for a couple of hours, it started up, and drove home perfectly fine with full power.

I've been threw coils, plugs, injectors and software upgrades on this car. I'm wondering if this could be yet another clue leading to a HPFP replacement?

Does limp home mode feel like this, or is that even worse (from a power standpoint)?

Thanks,

Ron

[JL 325i]

limp mode would feel a bigger power loss. but did u just start driving the car and then go in 6th from 60-80? it could just be not warmed up but thats weird

[original732]

that is so strange.

[RonRed89]

Originally Posted by JL 325i

limp mode would feel a bigger power loss. but did u just start driving the car and then go in 6th from 60-80? it could just be not warmed up but thats weird

The car was at normal operating temperatures at the time that the 60-80MPH "pull" was done. Given that I was lazily driving before this, I didn't notice the power loss until I tried to make a pass on the freeway, but by that time, the car was warmed up.

Ron

[hipnotic]

interesting

[ChasVS]

What were the revs at 60 when you tried to pull to 80? If you were essentially coasting at that point it would take some time to spin up the turbos cause they ain't spinning much at low revs.... Did the happen once on the drive or multiple times under different conditions?

[RonRed89]

Originally Posted by ChasVS

What were the revs at 60 when you tried to pull to 80? If you were essentially coasting at that point it would take some time to spin up the turbos cause they ain't spinning much at low revs.... Did the happen once on the drive or multiple times under different conditions?

The revs at 60 were right at 2k and the revs at 80 under normal conditions are right below 3k or less. Let's put it this way, there should not be a need to downshift to 4th gear to make a pass on one car on the freeway in this type of car which is what had to be done in this case when it was acting up. The power was down in all gears at all speeds. Even a WOT hit on the throttle in 1st gear wasn't even close to normal power output, so it wasn't a matter of the 60 to 80 pull being the only thing that was off.

Btw, I am not sure that I agree with the coasting statement. 2k rpm is 2k rpm. The turbos are really already primed and ready for action at that rpm level. I could expect way different results trying to lug the car in too high of a gear with RPMs in the teens, but by 2k, it should be instant action time.

Took it out again tonight and everything is back to complete normal expectations.

Ron