Join Date: Apr 2002
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YJ - Bad Distrib. hold down?
Alright, well my 90 YJ has gotten in the habit recently of changing the timing at will. I never really noticed until this afternoon that the distributor is physically moving.
Right off hand, I'm thinking it's the hold down clamp.
It is Nuttered - and I can set the timing with a timing light to 10* BTDC @ 1600RPM and crank down on the distributor bolt and can not turn it by hand. However, without fail if I put any kind of stress on the engine, like climbing a large sand hill, it will undoubtedly drop down to 1* or 2* BTDC @ 1600RPM, which means at idle it's a few degrees ATDC.
Again, if I get out to reset the timing, the distributor has physically moved.
Is this concurrent with a bad hold down clamp, or is there something more sinister at work here?