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Old 11-20-2008, 09:30 AM   #1
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Default misfire po307, not ignition problem !!!

need help, i own a 1999 f150 4.6 4x4 w/ kenne bell supercharger, it started to misfire while driving to work but code did not come on right away, code read po307 misfire # 7 . i checked resistance on ignition wire (ford racing 9mm) wire is good, pulled plug( autolite xp iridiums ) plug looked good but tried a new one just in case. replaced coil pack w/ msd 8241, still a misfire.

so, injector resistance good 14.5, i tried a noid on the injector connector, and no signal !!!! two wires on the injector pigtail is red (+) and tan w/ red stripe (groung signal) i have good connection on red, havent found the pin 72 on the pcm to see if i have a signal.

has anyone come across something like this before, and so what was the outcome?

anyone know if this is common?

thanks guys
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Old 11-24-2008, 03:03 PM   #2
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[quote=kaci1989;112959]need help, i own a 1999 f150 4.6 4x4 w/ kenne bell supercharger, it started to misfire while driving to work but code did not come on right away, code read po307 misfire # 7 . i checked resistance on ignition wire (ford racing 9mm) wire is good, pulled plug( autolite xp iridiums ) plug looked good but tried a new one just in case. replaced coil pack w/ msd 8241, still a misfire.

so, injector resistance good 14.5, i tried a noid on the injector connector, and no signal !!!! two wires on the injector pigtail is red (+) and tan w/ red stripe (groung signal) i have good connection on red, havent found the pin 72 on the pcm to see if i have a signal.

has anyone come across something like this before, and so what was the outcome?

for all those reading i have found the problem. there is a break in the injector wire from pcm. all that is needed for repair is running a new wire spliced at the pcm connector and injector connector, and everything works i dont know how common this is but for any of you that are baffled just email me i can give you more details.
kaci1989 is offline   Reply With Quote
Old 03-24-2010, 06:40 PM   #3
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don't know half of what your talking about, but I've got this miss and the autozone guy read the codes and said I had a problem with 3 & 4, and to read out the injector, but I don't know the reading I'm suppose to get. Do You?
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Old 09-21-2011, 05:45 PM   #4
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Default PCM Where is it...? Pin #72...?

[quote=kaci1989;114447]
Quote:
Originally Posted by kaci1989 View Post
need help, i own a 1999 f150 4.6 4x4 w/ kenne bell supercharger, it started to misfire while driving to work but code did not come on right away, code read po307 misfire # 7 . i checked resistance on ignition wire (ford racing 9mm) wire is good, pulled plug( autolite xp iridiums ) plug looked good but tried a new one just in case. replaced coil pack w/ msd 8241, still a misfire.

so, injector resistance good 14.5, i tried a noid on the injector connector, and no signal !!!! two wires on the injector pigtail is red (+) and tan w/ red stripe (groung signal) i have good connection on red, havent found the pin 72 on the pcm to see if i have a signal.

has anyone come across something like this before, and so what was the outcome?

for all those reading i have found the problem. there is a break in the injector wire from pcm. all that is needed for repair is running a new wire spliced at the pcm connector and injector connector, and everything works i dont know how common this is but for any of you that are baffled just email me i can give you more details.
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Old 09-21-2011, 05:45 PM
 
 
 
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