Misfire Question
#1
Misfire Question
Over the last few months my 2004 FX4 has developed a slight "Misfire" while idling. Truck has 160K+ miles and the plugs were changed around 120K miles. The other day I popped the hood and started unplugging COPs while running. Only 3 or 4 of the 8 made it run rough when unplugged. The others I unplugged made no difference which leads me to believe that I have some bad COPs. Can anyone chime in and confirm my suspicions?
#2
Can you get any codes pulled? If you have a misfire, you should be able to see that. Go to your local autozone, advance auto, O'Reilly auto parts and get them to pull the codes. There's a bunch of things it could be, but don't guess by disconnecting COPs. When did you do plugs last?
But yeah, go get your codes read.
But yeah, go get your codes read.
#3
I have a scan tool but there are no codes. The new plugs only have 40K miles on them. They were changed a couple weeks after I bought the truck. The new one piece plugs were installed.
#4
Senior Member
We're boots and springs changed when the plugs were done?
#6
Senior Member
#7
Senior Member
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#8
I removed a couple of the front cops and the boots look fine. I notice that it's worse when the motor is could. There is a slight hesitation when accelerating and then I feel it start to pull harder.