mSolve

folks, a while back i noticed a slight 'hunting effect' like the engine wants to cut when cruising along at 60 - 80 km/hr. the dealer replaced oxygen sensor; thermostat and the battery. for a month or so the car was ok. nw, i am noticing it again but it's very light like its at the early stages. like before, it goes away when i give it more gas to cruise at slightly higher speed than the speed range i mentioned above. the car comes off the warranty in september nd, naturally i am concerned. any suggestions as to the cause of this hunting effect?

v_therussian

If you have a 535, may be the HPFP

John@Motorcepts

he has a 2004 525i. It could be fouled injectors, plugs, anything! First thing to do is use fuel injector cleaners for 3 cycles. See if that solves the problem.

mSolve

mmmmhh, i still have about 8000km to go before service. i will use fuel injector cleaners to start with. thanks a lot!

JStraw

Before you try anything read this post in another forum first.
http://www.bimmerfest.com/forums/sho...=1#post5280796

If, per SI B 24 03 09, "Judder when gently accelerating (most noticeable at an engine speed below 2,000 RPM)" is what you are experiencing, then you might need a re-programming done.