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FE Technical Forum / Re: 1963 Ford Galaxie 390FE with Holley Sniper EFI
« on: September 29, 2021, 01:59:36 PM »
It is about a point too rich everywhere on the table.
Cruise timing should be about 8degrees more than WOT. You have cruise lower than WOT right now. If WOT is 35, set Cruise to 43 and try that. You may also want to speed up the timing, bring more in sooner. That really helped mine.
Set crank timing about 3 degrees lower than initial, this is the lowest timing it will order. Having a range of timing available at idle really helps it control idle quality, it's a faster reaction than air or fuel to add or pull a couple degrees to maintain idle speed.
Have you messed around with accel fuel settings at all?
Are you absolutely certain you do not have even the faintest exhaust leak on the side with the O2 sensor. These units are very susceptible to exhaust leaks. It will read oxygen coming in through the leak at idle and part throttle and add fuel to compensate, thinking the engine is lean and it will run terrible. At heavier throttle and engine speed, no air comes into the pipe, so the system gets accurate readings and runs much better.
Hope you figure it out, they are a dream when running well.
Cruise timing should be about 8degrees more than WOT. You have cruise lower than WOT right now. If WOT is 35, set Cruise to 43 and try that. You may also want to speed up the timing, bring more in sooner. That really helped mine.
Set crank timing about 3 degrees lower than initial, this is the lowest timing it will order. Having a range of timing available at idle really helps it control idle quality, it's a faster reaction than air or fuel to add or pull a couple degrees to maintain idle speed.
Have you messed around with accel fuel settings at all?
Are you absolutely certain you do not have even the faintest exhaust leak on the side with the O2 sensor. These units are very susceptible to exhaust leaks. It will read oxygen coming in through the leak at idle and part throttle and add fuel to compensate, thinking the engine is lean and it will run terrible. At heavier throttle and engine speed, no air comes into the pipe, so the system gets accurate readings and runs much better.
Hope you figure it out, they are a dream when running well.
