I have an 2004 525i with a similar issue, prior to buying it the previous owner had gotten misfire codes for two cylinders so he took it in for 100,000 tune up where plugs were changed which fixed misfiring. I guess shortly after the car began the issue it is having now, when accelerating from low speeds or a stop sometimes I will feel like a studded or hesitation and my rpm's will bounce between 15,000 and 20.000 until I either give car more gas or let off and re- apply gas which stops it and car runs through gears just fine, it is literally just in that one spot it has an issue and it is no where near a shift point. Thinking it was also fuel or air related I added a bottle of the Chevron fuel system cleaner and it helped kind of. Now when I gave issue rather than bouncing my rpm's will almost surge up by about 700 each time until shifting, one thing I noticed was that it seems to do it more when I am getting lower than a quarter tank of gas, also sometimes when the AC is on as well it feels like it does it more and also is lacking power more with AC on but that maybe just me rather than an issue with the car. It definitely does not feel like a transmission problem and it does not do it all the time but it is often. The best way I can describe it is that it feels as if the injector is having a hard time spraying so its causing rpm's to bounce until I give more gas which would open it more or let off an reapply which may also help open it. Has anyone else had to deal with anything like this? Also, I am not throwing any codes except to change rear break pads but that is due to sensor being broken when brakes were checked before I bought it.
Wednesday, June 6th, 2018 AT 12:55 AM