Chris, You say there is 12 volts, I assume that is to the FV. But is the other side of the FV grounded when your testing. The yellow/red wire coming off the RPM relay feeds 12v to the lambda relay coil when the car is running. If this is ok then check the 12v coming off 87b terminal or red/purple wire coming off the lambda relay going to the FV. If you have 12v there then make sure the FV is grounded thru the red/brown wire. Jolt it a few times with the voltage and if it doesn't run then it's probably bad. Make sure the lambda ECU is grounded and remove the connector and put it back.If you get the FV to run then let the 02 sensor heat up and depress the full throttle switch and see if it changes speed. If it turnes out that the FV is bad. I will buy it. Hope it turns out to be something simple. FV are about $120.00. John Hervey --- In dmcnews@xxxxxxxxxxx, "chris" <chris@xxxx> wrote: > Hi group > > My frequency valve is not buzzing, i have tested the pin 3 on the diagnostic plug and direct to the frequency valve using a frequency meter and a scope and there is no nice 'square' wave in fact there is very little. There is +12v though. > I was told solonoids are very reliable, but its possible in extreme hot and cold that it could cause them to stop working which could effect the ECU too. My car was left outside in NJ for around 8 years. > > Also my cat was glowing red, could the frequency valve not working cause this? > > Any ideas? > > Thanks > > Chris > Vin 16327 > > > [Non-text portions of this message have been removed]