Misfire Question
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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?
Fleet Mechanic
Joined: Feb 2011
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From: Thousand Oaks, CA
The coils are probably fine, but that's a lot of miles for the boots.
I've been using the NAPA 702418 boots ($6.30/ea) with no problems
You might want to get an OBDII bluetooth adapter and software (under $50) to determine which cylinders have pending misfires that don't set codes.
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When the plugs were changed were the boots replaced, too?
The coils are probably fine, but that's a lot of miles for the boots.
I've been using the NAPA 702418 boots ($6.30/ea) with no problems
You might want to get an OBDII bluetooth adapter and software (under $50) to determine which cylinders have pending misfires that don't set codes.
The coils are probably fine, but that's a lot of miles for the boots.
I've been using the NAPA 702418 boots ($6.30/ea) with no problems
You might want to get an OBDII bluetooth adapter and software (under $50) to determine which cylinders have pending misfires that don't set codes.
No the boots were not replaced
Thread Starter
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New User
Joined: Mar 2016
Posts: 5
Likes: 0
When the plugs were changed were the boots replaced, too?
The coils are probably fine, but that's a lot of miles for the boots.
I've been using the NAPA 702418 boots ($6.30/ea) with no problems
You might want to get an OBDII bluetooth adapter and software (under $50) to determine which cylinders have pending misfires that don't set codes.
The coils are probably fine, but that's a lot of miles for the boots.
I've been using the NAPA 702418 boots ($6.30/ea) with no problems
You might want to get an OBDII bluetooth adapter and software (under $50) to determine which cylinders have pending misfires that don't set codes.
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fitzy67
1997 - 2006 Expedition & Navigator
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Oct 6, 2007 03:57 PM
