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4' vacuum drop M117 engine
Hi folks a quick question for your consideration
My car wont go above 2500rpm without missing badly, the idle is perfect with no misses. my car is megasquirted so i can check on fuel and injectors and all systems are going as they should be but the car is running very rich as the vacuum is so low (still runs on map). I have spark when I test but cannot test at higher revs and the pertronix seems to be working fine. the only measurable change i have is that I have suddenly lost 4" of vacuum from 17 inches to 13 inches at idle. I cannot find any reason for the drop - all of the hoses and connectors check out, the brake servo holds vacuum and i have tested with all of the vacuum hoses plugged. The timing is spot on and the chain is new (10k miles). The valves all seem to be fine - the vacuum is steady at 13 inches at idle. I ran my borescope down the inner and outer plenum to check the 8 donuts and they are all intact.
anyone have any ideas?
thanks
Barri
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