07-17-2016, 02:41 PM
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CC Member
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Join Date: Apr 2010
Location: Tampa,
FL
Cobra Make, Engine: Everett Morrison
Posts: 144
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Not Ranked
Misfire with Jumpy Tach
This has me stumped..
They key is the jumping tach, seems like a primary ignition problem. Under load the car misses. Seems to be at its smoothest while at 3k, but once back under load it misses again. The tach jumps 1-2k either way. Wiggled all grounds at idle, no change. The cap has had pitted terminals for a while now, but not sue that would bounce the tach. If the tach just flucuated a little to match the drop in RPM i'd suspect fuel as well, but it jumps up as well as down.
Thoughts?
- Carb'd 5.0, fuel pressure is perfect
- Mallory Max-Fire dist with Mallory coil
- 2 years old with 4500 miles, never an issue
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Mike D
Tampa Fl
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