F150 4.9 cylinder 2 missfire. please help!! - FordTough.ca - Home of Canadian Ford Truck Enthusiasts
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post #1 of 14 (permalink) Old 09-12-2008, 09:30 PM Thread Starter
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Angry F150 4.9 cylinder 2 missfire. please help!!

Hello i have a 1994 f150 4.9 straight 6 engine. cylinder 2 has a spark and fuel but wont fire at all. here is a list of the things ive done

compression test = ok 110psi+
new rotor
new cap
tuned ignition timing
new plugs
swapped leads round but problem stayed in cylider 2
swapped injectors round but problem stayed with cyl 2 and checked power
removed rocker cover and checked push rods were working and nothing broken
had the error codes read and it came up with "spout connector open curcuit". been told that error is there because of the missfire.

does anyone know if theres anything electonic or mechanical ive missed that would cause this?

apprectiate any help

thanks
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post #2 of 14 (permalink) Old 09-12-2008, 09:52 PM
 
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check for crossfire between your plug wires



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post #3 of 14 (permalink) Old 09-12-2008, 10:31 PM Thread Starter
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whats that mean?
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post #4 of 14 (permalink) Old 09-12-2008, 10:48 PM
 
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Did you change Plug Wires?
If not you may have leakage between 2 wires



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post #5 of 14 (permalink) Old 09-12-2008, 11:41 PM
 
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crossfire is when your current jumps from wire to wire or another point. Best way to check is at night.



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post #6 of 14 (permalink) Old 09-17-2008, 09:51 PM Thread Starter
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nope no crossfire.

im thinking its got to be electrical but not sure what other than the coil. i think that would make it run rough on all cylinders wouldnt it?
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post #7 of 14 (permalink) Old 09-17-2008, 11:20 PM
 
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How is the spark on the cylinders 1 and 3 in compressing to #2 check it at night and look for colour (White or yellow)and intensity



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post #8 of 14 (permalink) Old 09-18-2008, 12:47 AM
 
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post #9 of 14 (permalink) Old 09-18-2008, 02:10 AM Thread Starter
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the scanner says its running rich but id imagine its because #2 not firing. i swapped injectors round and checked wiring with a flashing led tester.

what do you think would make 1 plug fire at the wromg time?
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post #10 of 14 (permalink) Old 09-18-2008, 03:39 AM
 
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try resetting the ECU



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