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Old 12-19-2018, 08:00 PM
Thomas C Potter Thomas C Potter is offline
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Extreme pre ignition runs like crap!

My 68 LTD has been running great for 10 years / 30k miles on rebuilt FE engine, stock, nothing fancy. Very consistent Barry Grant 650 carb, Pertronix ignition.

On same full tank of gas, ran great for the first 5/8, and within 20 miles slowly developed extreme pre ignition, low power. I almost had it towed home.

First was to check timing, right were it has been, 8 deg static, 34 full.
All spark plugs look good, I was hoping to see some crud lodged in 2 or 3 plugs, but none.

I am in process of drawing old gas and put in fresh. I always use name brand gas, no 7/11 or shettz crap.

Thoughts??
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Old 12-19-2018, 08:09 PM
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merc406 merc406 is offline
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Your on the right track
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Old 12-20-2018, 06:56 AM
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Turbov6Bryan Turbov6Bryan is offline
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Bad gas, fuel filter.

See if the carb has a small fuel filter right at the inlet, where the gas line attaches.

Then check to see if the fuel pump diaphragm is good or bad
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Old 12-20-2018, 12:29 PM
Grimrepairman Grimrepairman is offline
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Sounds like a lean condition. I'm doubting it's a vacuum leak, but not impossible. Could be a sticky float or some gunk in a jet. I clean lots of ethanol crud out of carburetors these days.
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Old 12-20-2018, 03:35 PM
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fairlane347 fairlane347 is offline
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I think your looking at right things. I however ran into bunch of trouble with Petronix (won't ever use it again). Just check that its working well. I have FE's as well and I run 12-14 of initial timing, especially with hotter ignition. That's with pump gas as well. Check for good grounds for your ignition too.
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Old 12-20-2018, 03:39 PM
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I'd bet it was a lean condition as well. check the fuel pump. You didn't accidentally get some E85?
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