In Reply to: Re: Hesitating acceleration posted by richard v. on December 23, 1999 at 17:43:33:
O2 sensor is probably a remote possibility. Generally if O2 sensor is failing it is a computer readable fault, but not always. I'm still puzzled about mine. Good Luck and have a Merry Christmas.
: : Sorry about the previous zigged when I should have zagged. Anyway, my 95 525i has a similar cold start problem. I've entertained all suggestions and came to a couple of new conclusions. It could be an Idle Air Control problem, but doubtful. Worst case it could be a faulty coolant temperature sensor. If this sensor is bad, the computer will not set the fuel mixture rich enough to counter the cold start. Just an idea.
: : Scott
: : 95 525i
: : : : My '92 535i seems to have some hesitation while accelerating when cold, with about 1/3 to 1/2 pedal. It seems to go, level off, go faster, level off, etc., very quickly but noticeable. After it warms up, I can't feel it. Any ideas?
: Good ideas Scott....But, I have cleaned & checked the idle control valve. It appears to be O.K. The temp. sensor reads the correct resistance, at least at 60 deg. & at the sensor. I need to check it at the DME. I also cleaned the Throttle Body, checked the throttle position sensor, adjusted the valves, cleaned the rotor & dist. cap, glass beaded the plugs & checked gap. Really puzzling. Our '93 325i did the same thing, but it was an automatic. We traded it before I found the problem. I'm woundering about the O2 sensor. If you get any ideas, let me know.