In Reply to: Help >>> 535i Hesitation posted by Mark on July 01, 1999 at 21:44:34:
If your mechanic has the right equipment, have him look at the O2 sensor response. What happened in my case is that the sensor wasn't dead, built up deposits were restricting the flow of gases in the sensor making its reporting of O2 very slugish. Therefore everything was ok if you sustained a speed, but it would go off when you changed speeds abruptly. Hence hesitation off the line due to wrong fuel mix info. Replaced the sensor and the hesitation disappeared.
Anyway that is what happened in my case, hope it helps.
: When taking off from a stop my 535i has bad hesitation.
: Its a '89 model, automatic transmission, 109k miles.
: I've replaced: spark plugs, ignition wires, cap and rotor, crank sensor, had the valves adjusted. My mechanic hooked it up to the diag and it returnd zero fault codes.