Frequency valve not buzzing 83'SC

[Scott R]

Originally posted by Vin-barrett
Hiya Scott

When I checked the voltage at the FV connector I am taking the pulsed ground out of the loop - correct?
In other words I put one probe of my meter to one of the FV connector's terminal and the other grounded right to the engine. This is where I am getting the 8.5 volts.

Like you said about a temporary line going around wiring issues.
I'm thinking running a long wire from terminal 87b at the relay under the seat straight to the FV to see if I get anything greater than the 8.5. I'm not sure what the voltage should be either.

Yes correct measured from an engine ground. It is strange that your getting low voltage. I know from testing injectors in the past that you need pretty close to 12V to get them to crack.

I suppose you could have corrosion in the CIS electrical connector aft of the FV valve, or somewhere else. It's a pretty short run from the relay to the flat black plug.

Good luck!

[Lorenfb]

Check here for the FV signal waveform:

www.systemsc.com/waveforms.htm

and then use a scope to verify that your Lambda unit is functioning properly.