New to me F-150 tune up info needed. - IMBOC
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post #1 of 4 (permalink) Old 04-10-2019, 10:30 AM Thread Starter

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New to me F-150 tune up info needed.

I bought a 2002 F-150 Crew Cab a few weeks ago. It was a farm truck before I got it. I think I've washed off and or vacuumed out a couple acres of South Texas dirt from it.



It has a slight misfire at idle that I've been working on. I changed the IAC valve, fuel filter and I am in the process of changing the C.O.P.S. and plugs. The 4 plugs I already changed looked good. It's a 4.6 with a little over 133,000 on it. If what I'm doing now doesn't get rid of the misfire, I'm thinking new MAF and maybe the EGR valve. Any other suggestions?

2001 DHG Bullitt. Bought new on 9-29-01. 4.10 gears, drilled and slotted rotors. 9" front and 10.5 rear black Bullitt rims. GT fog lights and Mach 1 chin spoiler. SR lowering springs, JLT Ram Air, Webtronics sequentials, MRT hood struts, MSD c.o.p.s
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post #2 of 4 (permalink) Old 04-10-2019, 10:52 AM
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When you do the spark plugs, check their colour. If any are dark or sooty, you may have a bad coil which is common on 4.6/5.4's. Clean the MAF carefully, and pull the EGR and look at it for crusty carbon, which you can clean. You can apply vacumn to see if it's working. Good luck.


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post #3 of 4 (permalink) Old 04-10-2019, 10:58 AM

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Best to use factory plugs and coils. Some aftermarket just do not seem to play real well with the 4.6s. May cost a little more but worth it in the end.
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post #4 of 4 (permalink) Old 04-11-2019, 10:16 AM Thread Starter

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Join Date: Feb 2004
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Bullitt Serialized Number: 02429
Posts: 9,084
I've done 6 of the 8 plugs. All look to be in range. Motorcraft plugs and C.O.P.S., so that leads me to believe they were never changed. I broke off a stud holding one C.O.P. down, and that sucks, but I did a workaround, and it should be okay.



Thanks!
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2001 DHG Bullitt. Bought new on 9-29-01. 4.10 gears, drilled and slotted rotors. 9" front and 10.5 rear black Bullitt rims. GT fog lights and Mach 1 chin spoiler. SR lowering springs, JLT Ram Air, Webtronics sequentials, MRT hood struts, MSD c.o.p.s
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