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Re: Hesitating acceleration (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by richard v. on December 23, 1999 at 17:43:33:

In Reply to: Re: Hesitating acceleration posted by scott on December 23, 1999 at 15:44:44:

: 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.

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