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Old 01-30-2011, 08:00 PM
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Join Date: Sep 2009
Location: Mechanicsville
Vehicle: 1997 Ford F150
Posts: 803
spark plug changing?

want to change my plugs and im spark plug ignorant...anyway what all do i need....i have the 97 4.2 many plugs? wires?...what kind?...i know motorcraft but is there a better one?.....and can i do it myself?
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Old 01-31-2011, 01:12 AM
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Join Date: Jul 2007
Location: London, ON Canada
Vehicle: 1997 Ford F150
Posts: 946
6 plugs and the motorcraft wires should be fine.

Stick with either Motorcraft, Autolite, NGK or Denso Irisium plugs. Do NOT get Bosch no matter how good the deal is. 99.9% of the time Bosch plugs will make the motor run rough.

Get a spark plug gap tool and make sure you gap the plugs to 0.054".
Before you change the wires label them and replace one at a time so you don't mix up the order.
The order of the cylinders when looking from the front of the motor is (left hand side is passenger side) 1, 2, 3. (right hand side is drivers side) 4,5,6.
On the coilpack make sure you connect the wires right, the order is 123 465, yeah 465, it looks strange but lots of ppl make that mistake.
Also to get at the #3 plug, the pass side one closest to the firewall, you'll need some sockets with universal elbows or you need to jack up the truck, take the pass side front tire off and come at the plug through the wheel well.
You may want to put a dab of anit-seize compound on the plug threads before you install them, makes it easier to take them out later.
Get yourself either a Hayne's or Chilton's repair manual for the step by step on most repairs.
97 XL 4.2L V6 Reg Cab Std Box 4r70w 3.73 TruTrac LS, General Grabber UHP 265/70R16s, Line-x spray-in bedliner, Truxedo Deuce tonneau, 20% tint, AF1 CAI, ASP UDP, Magnaflow catback SIDO, Magnaflow Hiflow Cats, Port & Polish 1/2 shaft TB, Troyer tuned.
Whaddya mean I don't pay my bills??
Whyddya think I'm broke!!

163.17 rwhp 231.59 rwtq (94 tune)
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Old 01-31-2011, 08:48 AM
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Join Date: Oct 2010
Location: Great Falls, Montana
Vehicle: 2011 Ford F150
Posts: 129
Just a friendly warning about spark plugs...

Many folks get caught up in "performance" spark plug scam.... and their trucks wind up with serious issues. Your year model may not be effected, but PCM tolerances on trucks from the last 2-5 model years have gotten pretty tight....meaning that if the PCM does not detect the "correct" plugs, the engine will not run correctly.

That being said, it's always a good idea to go with plugs that are as close to OEM as possible. If in doubt, contact a Ford dealer/mechanic...those few minutes might save you a LOT of hassles.
Ed Caffrey, ABS Mastersmith
"The Montana Bladesmith"
"Nobody Cares what you know...Until they know you care."
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Old 01-31-2011, 09:26 AM
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Join Date: May 2008
Vehicle: 2008 F150
Posts: 630
Stick with Motorcraft if possible.
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Old 01-31-2011, 11:46 AM
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Join Date: Sep 2009
Location: Mechanicsville
Vehicle: 1997 Ford F150
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sounds good....thanx guys
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