99 F150 4.6 when to replace coil packs
#1
12-16-2014, 07:53 PM
Join Date: Oct 2010
Location: Marshall and Tomball Texas
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99 F150 4.6 when to replace coil packs
150k miles.
My father-in-law's truck. He wants a tune up. He says it is running like crap. It is not missing though just down on power. Is it time for 2 new coil packs. I can get oem's on rockauto for 50 a pop. I am going to change the plugs, wires, fuel filter and clean the maf sensor. I don't know anything about the coil packs though. I have an 02 Lightning with the cop's.
My father-in-law's truck. He wants a tune up. He says it is running like crap. It is not missing though just down on power. Is it time for 2 new coil packs. I can get oem's on rockauto for 50 a pop. I am going to change the plugs, wires, fuel filter and clean the maf sensor. I don't know anything about the coil packs though. I have an 02 Lightning with the cop's.
Last edited by x_man586; 12-16-2014 at 07:54 PM. Reason: left something out
#2
12-16-2014, 08:10 PM
The coil packs seldom ever go bad - when they do, you will get a hard miss. Put Motorcraft plugs and wires on it, change the fuel and air filters, clean the MAF, and you could even pull the throttle body and clean it. The EGR passages in the TB elbow like to clog up. If it's down on power it may have plugged cats, a muffler shop can do a backpressure test. Have you checked the OBD2 for codes?
#3
12-16-2014, 08:33 PM
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