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Old 06-03-2009, 10:01 PM   #1
buckshot500's Avatar
Join Date: Mar 2009
Location: Carolina
Posts: 798
Intermittent power loss at speed

Rebuilt my MC2100 recently, (inlet needle seat was passing fuel) & installed a new fuel filter.
I am now experiencing a kind of intermittent problem at 55-65mph. Seemed like a fuel problem, percolating fuel or something.

With pedal holding a given speed, it would coast, then accelerate back to speed.

It was like a slowmo bucking.

I replaced the 7.5 power valve with the 8.5 one the Holley video procedure suggested. I thought it was cured, but it wasn't.

Today I retarded the timing from 8*btdc, back to 11*btdc. Seems to start easier, & run smoother. Acceleration is much better too. I'll see if it cured the stumble tomorrow!

Nothing else has been worked on with the engine since the carb rebuild.

90YJ 98XJ
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