I have 1997 f-150 4x4, 4.6L with the dreaded miss at idle. The truck has 87000 miles on it and I have the K&N filter kit installed. At idle when the truck is warm and has less than 1/4 tank of gas it misses. I have read most of the other posts on the subject and tested or changed several of the filters, pcv etc.. and still no fix. The throttle body is very dirty, but the haynes manual says not to use cleaners on it. Does anyone have a soultion?
Ford says not to use cleaners because they have applied a coating to the inside of you intake. Any cleaners will damage this coating.
1997 F-150, 4.6, automatic, Dark Toreador Red, Supercab, Flareside, 4X4 Off-Road, Towing Package, Factory moulded step boards, Ford hvy dty rubber floor mats, Kenwood 10-disk cd changer, Kenwood am/fm cassette head unit, PYLE 2000 Plus speakers, Ford bugshield, Black Manik push bar with 2 KC 100w Daylighters, wheel locks and spare tire lock, Ultra "Claw" wheels, Lund Lunar Visor, Ventshades, AVS slotted taillight covers painted to match, Ford bedliner, Lund Premier tonneau cover, cab and bed professionally undercoated, Code Alarm Sure Start RVS remote starter, Ford alarm, Realistic CB with Wilson Little Wil antenna and Astatic power mic, ported MAF sensor, Motorsport 9mm wires, dual platinum motorcraft plugs, K&N filter, Edelbrock throttle body, billit grille, and Lots of TLC!!
Fordflyer Just use some carb or throttle body cleaner on a rag or a nylon brush works the best. Thats what we use in our shop never mind what the sticker or manuals say I've cleaned more throttle bodys than you can imagime, this way dosen't hurt a thing.
21 years ase mechanic. dan
I absolutely agree.....clean your throttle body. There is a D.A.G. coating that is applied by Ford that creates a controlled seal between the throttle plate and the aluminum casting. If you clean gently with a wet rag and toothbrush, ( I mean wet with GUMOUT or other carb cleaner), you won't remove enough of this coating to make a difference. The engine has an idle control solenoid that compensates for small differences in idle air anyway.
When I ported mine it had metal shavings in it. I cleaned it in my kitchen sink with dish soap and water and brush. I was careful not to wet the tps contacts. No problem so far. I would suggest that any commercial product that claims safe for throttle bodies would be OK.
Jean Marc Chartier
00 F-150 XLT SC Flairside 4x4 4.6 w/5spd 3.55LSD
Warn XD9000i, skid plates, Draw tite class III,
Rancho RSX Reflex shocks,
BFG 285/75 R16 MTs,
Borla Cat Back, Headman Headers,
Modified Air Cleaner Outlet Tube
and air box, Ported Throttle body,
Shortened MAF sensor tower,
K&N air filter,
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