Quote:
Originally Posted by trac209
Yes I got the carbon button out and egr valve has been blocked off for years. After some research it seems the power piston could sticking and causing issues with the primary metering jets which would have symptoms I'm describing. I'll check this out and report back
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Blocked off welded or plate bolted down..?
If the latter I'd check for leak .
I'd also check for vacuum leak at the throttle shaft..
Is the 2 secondaries vacuum diaphragm and linkage that controls them working .
It could be the base plate plugs in the carb bottom leaking..
But you replaced the cap and rotor and it cleared up.. Did you do the lightning test on the plug wires (at night spray the wires with spray bottle and look for a lightning show..)
You moving them to do the cap might have moved a grounding plug wire away from the spot it was jumping spark to, and the wire(s) slowly made it's way back to the form/shape it was in before you did the cap and now is grounding out the spark.
I'd also think if the cap carbon button was broken.. there most likely carbon dust inside the distributor housing and on the parts.. the spinning action could put that in the air and you might find carbon tracking on your new cap or rotor or both.