Today we checked the secondaries with the plenum off acording to Marc’s instructions. They seem to be functioning OK.
The butterflies opened all the way on both sides, although they didn’t seem to pop open quickly like I expected.
We then re-installed the plenum and road tested.
It still starts and idles smooth, and after warmup I took it through the gears. This time it made it smoothly up to 4,500 before it stumbled again and power fell off (all with power key on).
Up until this problem it would pull smoothly from 2K to 7K in all the gears Without stumbling.
Today, in any gear it would build speed slowly, but if you put the pedal down all the way it would fall apart, missing badly.
We strapped a fuel pressure to the windshield and it registered 40-43 lbs. at idle a built pressure as revs climbed to 50 lbs. with the hammer down and bad stumbling.
This feels like a fuel problem, what should it be reading?
We’re going to check the fuel pumps tomorrow. Stay tuned.
Any thoughts are welcome.
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