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Frequency Valve 200 1984

posted by  JDukes on  Sat Apr 19 08:20 CST 2003
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I have an 84 Turbo and I seem to be having a problem with the frequency valve.

The first thing I noticed was a small fuel leak in the large hose that connects to the mixture control unit and injectors. The hose is a two part deal, harder plastic material that snugs into the nozzle with a second rubber layer. The upper layer was cracked (probably dried by the leaking fuel) but the lower layer didn't show any damage and both ends are snug to the nozzle. The leak is originating at the end of the hose where it meets the nozzle which made me think it was caused by a backup of pressure rather than a hose problem.


So I listened for the Frequency valve and it was intermittently buzzing. I checked voltage at the wiring harness and it was steady at 12 (although I did have to keep the throttle up to keep the car from stalling so that might have influenced things). Does it sound like this is just a shot frequency valve or is it possible that the problem could be caused by bad mixture and a hidden fault in the hose?

I would just replace the part if it were cheap but the local places are all quoting me 125-150.


Any insight would help.

Jesse








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    Frequency Valve 200 1984

    posted by  mcduck on  Sat Apr 19 10:07 CST 2003
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    last visit: Sun Sep 9 11:47 CST 2012
    [RELATED]

    One side of the frequency valve should be at 12 volts, the other is grounded by the lambda system.
    There's no way normal fuel pressure will cause a leak in any of the hoses; there must be a crack.
    Take a look at your fuel pump relay, since it powers both the frequency valve and the rest of the lambda system through a relay next to the battery. The usual cracking of the solder in the relay will often cause frequency valve problems.







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