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BMW Repair/Frequency Valve On BMW 320i E21 1980

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Expert: Don Berlan - 2/18/2009


Question
How do you detect the pulse signal from the ECU, on my car the blue/black wire to see if it is emitting a pulse sigal?  The black/yellow wire from the lambda relay, terminal 87, has power to it.  The frequency valve is not buzzing.  What is the problem and how do I correct it?

Answer
Wow your getting into it way to deep.Its a 320i.Chances are if its not bussing it doesn't work.Although any drivablity problem shouldn't start there. Mechanical fuel injection isn't the same diagnosis as electric fuel injection so you really need to go to the basics on this one.

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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