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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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Old 03-30-2008, 01:06 AM
dadirtydogg dadirtydogg is offline
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misfire - but only in OD under a load

my 04 5.4L is misfiring on cylinder 2, but only in OD and under a load and doesn't start doing it until pretty well exactly the same rpm everytime. changed the spark plug and switched the coils from cylinder 1 and 2. still misfiring on 2. so what else could it be other than a fuel injector? gonna switch two of my injectors next i guess. see what that does. by the way, i ran the power balance program on it, which is how i can tell which cylinder is dropping. all i knew before was the truck would vibrate under load in OD... i thought it was a tranny problem. OD clutch or something. turned out to be a misfire. anyone encountered this problem before?
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04 F150 SCrew Lariat 3V 5.4L, 3.73s, 3"level kit, 3"rear blocks, 33.2"s, magnaflow catback, afe cai, edge evo, no rear cats, alum billet grill & bumper ins, ss bedrails, elec fans

93 Camaro mild cam, 1 3/4" ss headers, flowmaster 50s, no cats, cai, plat plugs, msd coil, cap & rotor, 8.5mm wires, 3.73s, 160 therm, 6 speed, lowered, 18" 5 spokes
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Old 03-30-2008, 04:15 PM
llcool llcool is offline
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As you mentioned check the injectors
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Old 03-30-2008, 06:26 PM
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dlgentry dlgentry is offline
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Never had this problem but since you already changed plugs and coil wires, it sounds like an ecm problem to me, if you switch injectors and it does the same thing, there is nowhere else to go other than the ecm...... good luck sounds like a doozy!
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Old 03-30-2008, 08:07 PM
dadirtydogg dadirtydogg is offline
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maybe a dumb question but by ecm do you mean the computer? i always heard it referred to as pcm?
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04 F150 SCrew Lariat 3V 5.4L, 3.73s, 3"level kit, 3"rear blocks, 33.2"s, magnaflow catback, afe cai, edge evo, no rear cats, alum billet grill & bumper ins, ss bedrails, elec fans

93 Camaro mild cam, 1 3/4" ss headers, flowmaster 50s, no cats, cai, plat plugs, msd coil, cap & rotor, 8.5mm wires, 3.73s, 160 therm, 6 speed, lowered, 18" 5 spokes
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Old 04-02-2008, 11:48 AM
3xrace 3xrace is offline
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I was getting a code 301 for a misfire on cyl one. It had nothing to do with cyl 1 as it turned out. It was the cyl 7 coil pack giving me grief. It took a long time for the computer to finally spit out code 357 for me.
I'd say reset the computer and drive it around until it the cel comes back on and check it again.
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Old 04-03-2008, 09:07 AM
dadirtydogg dadirtydogg is offline
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wasn't giving me a code.... found the problem. cylinder 6 wasn't sparking which for some reason made it appear as if cylinder 2 was misfiring.... anyway when i changed my plugs i broke cyl. 4 & 6. took it in to the local ford dealership, got them to pull the broken plugs and put in the two new ones i supplied. guess they decided to keep my new plugs and put in plugs that appear to have 150,000 miles on them.... so worn out the electrode is burned right off. took it to my buddy's dealership will home for vacation. sure enough.... the dealership that caused it is denying any responsibility. whatever all said and done it cost me less than $200. big deal. at least i know where not to take my truck
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04 F150 SCrew Lariat 3V 5.4L, 3.73s, 3"level kit, 3"rear blocks, 33.2"s, magnaflow catback, afe cai, edge evo, no rear cats, alum billet grill & bumper ins, ss bedrails, elec fans

93 Camaro mild cam, 1 3/4" ss headers, flowmaster 50s, no cats, cai, plat plugs, msd coil, cap & rotor, 8.5mm wires, 3.73s, 160 therm, 6 speed, lowered, 18" 5 spokes
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Old 04-03-2008, 09:07 AM
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