Quote:
Originally Posted by markpj23
So I guess I should trust my instincts more. Turns out the PO had intentionally retarded the timing in order to get it to run halfway decent with a bad carburetor.
Took the car in to a local mechanic and he discovered that the idle mixture screw for the left bank is broken / has no effect. He also verified the crazy timing setting and set it back to 8 BTDC as it should be. Car now really runs like crap.
Off to buy a replacement carburetor. Many thanks to all who have helped me work through this.
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Factory intake doesn't have a "left bank" mixture screw.
Did the mechanic say anything about the metal covering the EGR ports? The way the mixture screws work on that carb, a bad vacuum leak would make a screw non-functional.
Did the mechanic verify TDC on the balancer.
Did the mechanic blow out or clean air bleed holes to try and get that mixture screw to work?
Slowing initial timming for a bad carb makes no sense at all. That would just make things worse.
Need to verify the TDC mark and then, if needed, pull a valve cover and check "cam timing". It can be looked at on cylinder 1 or 6 during overlap. We can get you plenty of directions on here for that.
Clay