Nebie With Drivability issue
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Nebie With Drivability issue
hey everyone been lurking around here for awhile and now I'm here and glad to be. I have a 99 F150 4.6 2wd SC SB. I recently bought this truck to add to the ford fleet and noticed if i'm in overdriver and ease into the gas it will lug and then begin missing. If i'm getting on the freeway and the rpms are up there are no issues though. No codes
Fluids changed front to back, air filter changed, fuel filter changed. Truck has 69,000 miles on it. The previouse owner took very good care of the truck. Anyone have an idea what this miss could be?
Thanks
Shawn
Fluids changed front to back, air filter changed, fuel filter changed. Truck has 69,000 miles on it. The previouse owner took very good care of the truck. Anyone have an idea what this miss could be?
Thanks
Shawn
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Take it to autozone and have it tested with the scanner. My expedition just did the same thing, mine had a bad c-o-p. I changed it and it runs great now. only problem is, a c-o-p is a dealer item, about 80 bucks. Clint
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From: Canada
I would replace the spark plugs before you start changing any cop,s. If there are no codes in the memory the plugs would be suspect to misfire under load. Could also be a dirty injector (try fuel injector cleaner) or the plug that connects to them or the cop connector. If the check engine light isnt coming on you wont get a code but there might be one stored in the memory from previous. My 2000 f150 4x4 was at 71,000 miles and had a code for misfire cyl 5 even after I replaced the cop. New spark plugs solved it.
Try ebay for non oem cops they sell for $25
Try ebay for non oem cops they sell for $25
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Thank you for the reply. I wouldn't think it needs plugs arn't they supposed to be good for 100k in those trucks or is it just in the newer models?
I did run a bottle of redline SL-1 through it already. It deffinetly feels like a plug or COP but I have no idea how to tell which one and dont want to replace all COPs
I did run a bottle of redline SL-1 through it already. It deffinetly feels like a plug or COP but I have no idea how to tell which one and dont want to replace all COPs
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Joined: Dec 2009
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From: Canada
If the plugs are orig. they have been in for 10 years.
They are known to seize in the aluminum head and tear the threads out.
There is a procedure when removing the plugs and use anti-seize on the threads when installing the new ones. I also put some silicone on the cop boot to keep the moisture out.
They are known to seize in the aluminum head and tear the threads out.
There is a procedure when removing the plugs and use anti-seize on the threads when installing the new ones. I also put some silicone on the cop boot to keep the moisture out.
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I thought the 99 had iron heads? If not it sounds like i'll let somebody else ( Stealership ) do it
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sorry, I took mine to the dealer and they hooked it up and it showed a misfire, I didn't have a cel on either. they changed the cop and plug and it runs good now. It also happened to be cyl 8 so they did the work much easier to have them do it.
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The diagnostic info you get from a code reader is very limited if you want to actually fix the vehicle. Sure you get the DTC, but what do you do next? You need a good scan tool(as well as a lot of other tools) to do diagnostics and you have to know what you're looking at to properly pinpoint the faulty component. You can get a good PC based scan tool that covers most brands for $1000 and some for under $500. Many times you will get misfires on Fords, but not get a DTC because the threshold has been set so high by Ford engineers. You may know there are misfires because of driveability issues, but your check engine lite may not even be lit. What do you do in that case because the code reader which you're trying to use for diagnostics will come up blank. Then it's time to go fish or be a parts swapper unless you know how to find misfires with out a DTC pointing them out to you.
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