2001 4.6L Still missing
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2001 4.6L Still missing
I have a 2001 F150 4x4 with a 4.6L, 5-speed. Engine had a bad miss, changed plugs with Motorcraft platinums. Did not help. My cousin looked at the truck and suggested a fuel pump. Replaced the fuel pump and it helped but miss is still there. Pulled wires on injectors and determined #4 was not firing. Swapped #4 COP and Plug with #2 COP and plug. No change. Installed a hotter plug in #2 and ran smooth while idling for 15 min. After a quick trip up the road still slightly missing. What should I do now? Install hotter plugs for the rest of the cylinders or replace the coil pack on #2. Any feedback woud be greatly appreciated.
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If you have a (solid) miss, there should be a code set that will tell you what cylinder it is.
How the system detects it is by actually measuring the crank rotation time and compairing it with the rest of the cylinders within rpm limits set in the program.
Makes little difference what causes the miss, it's time related for crank rotation.
Use a Scanner to see if one is set and possibly avoid all the extra work trying things and possibly getting confused with faulty old parts.
Good luck.
How the system detects it is by actually measuring the crank rotation time and compairing it with the rest of the cylinders within rpm limits set in the program.
Makes little difference what causes the miss, it's time related for crank rotation.
Use a Scanner to see if one is set and possibly avoid all the extra work trying things and possibly getting confused with faulty old parts.
Good luck.
Last edited by Bluegrass; 06-28-2011 at 11:36 PM.
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Return to stock with device. Once your in stock mode, -disconnect the battery, both sides for one half hour. Reconnect POSITIVE FIRST.
Tell me how it runs.
Last edited by jbrew; 06-30-2011 at 07:48 AM. Reason: Positive first.
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I agree, stop with the plug heat range changes.
A stock motor never needs this consideration.
Normally the plugs will look a little whiteish as it is because the OX sensors keep the A/F ratio spot on so the plugs are clean looking for color.
Using a hotter plug is not accomplishing anything in a fault free stock motor.
Do not apply the old carburation thinking to an FI motor. There is no compairison.
The EDGE monitor/tuner does not have "all" the codes and discriptions to display in it's program so you may miss some, at times.
Good luck.
A stock motor never needs this consideration.
Normally the plugs will look a little whiteish as it is because the OX sensors keep the A/F ratio spot on so the plugs are clean looking for color.
Using a hotter plug is not accomplishing anything in a fault free stock motor.
Do not apply the old carburation thinking to an FI motor. There is no compairison.
The EDGE monitor/tuner does not have "all" the codes and discriptions to display in it's program so you may miss some, at times.
Good luck.
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Yea, they started using dedicated coils , - late 2000 I believe. So, your coils don't run a pack of cylinders, - you know ? -They are however responsible for just one. When they're not eF'en off
Good Luck.