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Re: B21 K-jet woes... 200 81

posted by  someone claiming to be Rob Kuhlman on  Fri Jun 29 09:00 CST 2001 [RELATED]

Hi, again, Jim!

Thanks for getting back to me so promptly. I didn't find an entry for the 'frequency valve' in the Bentley 240 book index, nor was it depicted in the CI fuel injection section. So I went to the Bentley Bosch fuel injection book, and there was something depicted called a 'lambda valve'. In the text, it read "lambda valve, also called a 'frequency valve'..." Voila! So I went back to the Bentley 240 book under lambda systems, and they said go to 'emissions controls'. So...under the emissions controls index, there's a reference to frequency valve. Pretty byzantine...

Because I use a direct drive flex fan on this B21, rather than the clutch fan, the whoosh of air drowns out most noises. I used a vinyl hose, however, to hear that the frequency valve was indeed buzzing (I found it in direct view, right in front of the big bellows). The Bentley manual has a procedure to determine if it's receiving voltage, so I pulled off the harness connector to perform this test, and the engine immediately bogged down and stalled. I measured resistance between the terminals on the valve, and it was 2.3 ohms -- Bentley says it should be between 2 and 3. So...it seems that it's functioning, (and indeed has a huge impact on driveability) and the valve itself is within resistance specs.

Rats...struck out there, it seems... That would have been an easy fix.

Thanks again for your input!

Rob





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