Engine misfire
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Senior Member
Joined: Nov 2006
Posts: 234
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From: Alton, IL
Engine misfire
Truck ran fine monday morning when we drove to the golf course. fired it up from the golf course, ran fine for about 2-3 minutes then started a horrible misfire. Threw the service engine soon light, then started flashing(owners manual says engine misfire when this happens). Took it straight to autozone to get the code ran, and it said #4 cylinder misfire. Changed with a new coil pack and motorcraft spark plug. Started truck up, idled fine for about 5 minutes, took it for a test drive and its still misfiring just as bad. Any ideas on how to fix it? Fuel filter is about 20k miles old so its not terrible, new air filter, fresh oil change. Only threw the code saying #4 misfire. its a 01 f150 4x4 with the 5.4 and auto tranny
Senior Member
Joined: Sep 2007
Posts: 1,512
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From: >wwOwww<
If you went to Bush wood Country Club, I'd check for rodent chew marks on the injector wires.
Seriously, it's common for animals to chew wires. I'd start by checking that. A can of injector cleaner couldn't hurt either.
If that don't help post it up.
You could also pull the plug to see if it is soaked in raw fuel. It can be bad for you catalytic converters to drive it that way.
Seriously, it's common for animals to chew wires. I'd start by checking that. A can of injector cleaner couldn't hurt either.
If that don't help post it up.
You could also pull the plug to see if it is soaked in raw fuel. It can be bad for you catalytic converters to drive it that way.
Member
Joined: Jul 2006
Posts: 16
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From: ARIZONA
The same thing happened to my friends 05 Expy 5.4 truck. I helped him replace the coil and sparkplug on the # 4 cylinder and cleaned the injector...after a few minutes it was the same, misfiring. We ended up taking the valve covers offs and we found that the variable timing actuator was faulting and had to replace it with a new one from Ford...$250. The weird thing is that this was on the bank 2 side of the engine but the codes read that the #4 cylinder was miss firing which is on the bank 1 side of the engine...??? anyways it fixed the problem.
Senior Member
Joined: Nov 2007
Posts: 3,271
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From: whaleyville, MD
The same thing happened to my friends 05 Expy 5.4 truck. I helped him replace the coil and sparkplug on the # 4 cylinder and cleaned the injector...after a few minutes it was the same, misfiring. We ended up taking the valve covers offs and we found that the variable timing actuator was faulting and had to replace it with a new one from Ford...$250. The weird thing is that this was on the bank 2 side of the engine but the codes read that the #4 cylinder was miss firing which is on the bank 1 side of the engine...??? anyways it fixed the problem.
do you have a voltmeter? check the voltage to and from the injector and coil. you said that you got a new coil and motorcraft spark plug- what brand was the coil? and just so you know its not a coil pack(fires multiple cylinders)
its a coil on plug ignition system(1 coil per cylinder). just so countermen at parts stores know what your talking about later on.