Engine Timing wont stand still
1st place I would look would be at the timing chain gear key way...or the oil pressure tension slide bar for the chain...??? something is moving and is not tight...
Celica has a 3SFE engine has no timing chain,has belt instead. when I hook-up a timing light on it, I short -out the" E1 and T " terminals then I move the distributor see the timing mark goes back and forth does not stay put.
Yeah the belt is most likely stretched, has it been replaced?
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