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BMW Repair/tach not working

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Expert: - 8/3/2006


Question
1987 325i WBAAB5405H9808404  TACH NOT WORKING VERY HIGH IDLE. WHEN ACCELERATE CUTS OUT AND QUITS RUNNING IS THERE A TACH SENSOR ON FLYWHEEL? & WHERE IS IT.COULD IT B SPEED SENSOR WHERE IS IT. THANK YOU ARCHIE  

Answer
The tach is there to indicate engine rpm,it gets its reading from the negative side of the coil there is no sensor for the tach.The high idle could be a dirty idle control valve causing it to stick at a high idle,cleaning that might help.And as far as the cutting out I would check all the ignition components(plugs,cap,rotor,and wires)

BMW Repair

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Volunteer

Don Berlan

Expertise

ASE Master Mechanic for 25 years. Can help with all aspects of BMW repair. I especially enjoy driveablity problems, mechanical or electrical.

Experience

I have been an ASE Master Mechanic for 25 years.I have worked in many dealearships although BMW's are my favorite.I now have my own shop,specializing in BMW's.I have autocrossed and even gotten into mud running with my 4x4.(I am NOT a teacher and don't claim to know everything about the cars I never see.I hope to help you with your repairs and do expect some knowledge on your side.)

Education/Credentials
CMVTI, Auburn Maine

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