Quote:
Originally Posted by Mxfrank
This is a classic example of a failing OVP. The only valid test is to replace with a new OVP.
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Over the years my SDL had same. Also AC may cut out.
I've also found that new aftermarket OVP can also be bad out of the box.
So if you try a new one and you have the same symptoms, try another OVP.
I keep a spare OVP in the glove box now primarily because a bad one can cut the AC out...and I often travel the desert south west in summer.
Weird part is temperatures (engine bay) seem to affect the OVP failure. Or Partial failure i.e. tach ok but idle will jump around, or idle ok but no tach.
Also check the fuse box (maybe #17) & fuse contacts. Check the reference sheet under the fuse box lid. On occasion gets corroded and cuts the tach out.