Question about 2001 BMW Z3

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I am currently experiencing engine idle problems, i have recently purchased the vehicle and the engine has been fine until now. When i stop at junctions and the engine is idleing it seems to now and again drop so low that the engine seems it is about to cut out and it jus revs up and down erratically between 400 and 900 revs.

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  • alpha12345 May 11, 2010

    I HAD A 2LTR Z3 AND IT DONE THE SAME THING ONLY WHEN COLD? DOES YOUR Z3 DO THIS ONLY WHEN HOT ? AND WHAT IS THE MILLAGE ? LET ME KNOW IF THE BMW HAS GOT HIGH MILEAGE THEN IT DOES HAPPEN WHEN THE BMW HAS OVER 130,000 MILES ON THE CLOCK IF NOT THEIR ARE A FEW PIPES COMING OFF THE AIR BOX CHECK THEM WELL AS A SMALL HOLE OR **** IN THE AIR FLOW SYSTEM WILL DEFINITELY COURSE THIS PROBLEM HOPE THIS HELPS MIKE

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  • Master
  • 410 Answers

You need to replace your IAC (idle air control valve). The IAC, like it sounds, control the idle of your car. When they go bad they will cause the low idle and stalling. The IAC is located on the throttle body and is usually held on with a couple of screws. It is an easy relatively cheap fix that you can take care of by yourself. Let me know if you have any more questions. Thanks for rating my response and for using FixYa!

Posted on Jul 18, 2009

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emissionwiz
  • 70387 Answers

SOURCE: revs drop coming to standstill

Here is the cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on May 12, 2009

6ya6ya
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Posted on Jan 02, 2017

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