Hi all - longtime member here, but don't get to post as often as I'd like!
I'd like some input on something I've noticed with my 2003 330. At present, I have a long commute, nearly all interstate highway so the vehicle gets up to temp and gets to stay there for at least an hour.
This is a 2003 330i, 6spd, ZHP, with 216000 miles. What's happening is a brief loss of power around 2k-2500 RPM with some load on the car - say 2nd gear, or 3rd gear. It's very specific - once the revs get past about 2500 or so the car is fine, pulls just like one would expect all the way to redline. I know the ZHP has had a host of these types of issues over the years, mostly solved through software. I am at the latest revision of software offered for this vehicle.
The pre-cat O2 sensors have recently been replaced with Bosch (no wire splicing) units. The plugs are about 36k old, and are NGK BKR6EQUP. The DISA isn't original, but has been in there a while - about 130k. The CCV system also has not been replaced - not long ago I did some testing with a Dwyer Magnehelic gauge and things appeared in spec; however, I haven't checked lately. Years ago, as part of a campaign, the coils were replaced.
I also recently replaced a failed mass air flow sensor. The car definitely feels more alive with the new MAF, just this one little issue remains. I do not have an SES light or anything on. I'm not sure what additional information or testing I need to perform to help troubleshoot this issue. I do have access to INPA/GT1. During a recent visit to the dealer for an alignment I was told there are no air leaks in the motor, but I'm not sure if a smoke test was performed.
Also, for those with INPA/GT1 experience on this DME, where are you finding the long/short term fuel trim info?