325i High Rev Idle
Printed From: Bavarian-Board.co.uk - BMW Owners Discussion Forum
Category: Technical & Model Specific Forums
Forum Name: General Motors
Forum Discription: This forum will deal with technical issues for the cars not dealt with in the other forums. These don't need to be BMWs!
URL: http://www.bavarian-board.co.uk/forum_posts.asp?TID=434
Printed Date: 26-June-2024 at 10:40
Topic: 325i High Rev Idle
Posted By: michael760
Subject: 325i High Rev Idle
Date Posted: 02-January-2003 at 17:05
I have a 89 325i with 70k on the clock and have a problem when i come to a stop the engine idle sits at 1300rpm for a second or 2 then slowly drops down to normal.I was told to disconect the battery overnight and when reconected it seemed to be ok for a day then it was back to normal again.Is it a possable ecu fault? I've also been told that the earler 153 ecu's are crap and should look out for a 173.Anyone got any idea's!! Cheers MIKE.
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Replies:
Posted By: seany
Date Posted: 12-January-2003 at 17:16
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Hi Mike Could be that you have a faulty Idle Control Valve or Crankshaft Pulse Sensor. Neither part is particularly expensive but are difficult to check if you don't have access to certain tools (i.e. ohhmmeter). One check for the Idle COntrol Valve (this is a T or L shaped valve running inline between the air box and the injection manifold) is to disconnect the electonic connector from it. This is held in place by a metal clip. The engine must be at running temp (about 60c) with all electrics turned off (auxillary cooling fan, heater, lights etc.). With the engine running disconnect the connector, the revs should jump up to about 2000rpm, if they dont the vavle is probably faulty. If you aren't happy doing this take the car to a BMW garage and they will put it on a diagnostics machine for about 50 quid.
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