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Old 05-06-2012, 07:05 PM   #1
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Default Want to replace spark plugs in 86 2.9... any opinions

I need to do a tune up on my 86 B2 2.9 4x4 and I was going to start with plugs and wires because i just bought it and not sure the last tune up it has had. I have been debating between the factory Motorcraft plugs for $5-7 each or going with the Autolites from advance auto for $2-4 each. I have worked at advance but I have never had to change the plugs in any of my vehicles so I'm not sure what works or not. Any tips and opinions is appreciated
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Old 05-06-2012, 08:09 PM   #2
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I would stick with Motorcraft Plugs, Autolights just don't last as long.
I maintain 3 company Rangers, Autolights plugs only last about 20k to 30k and look worse than Motorcraft at 100k
Upgrades to my 87 Ranger:
93 ECU, 95 4.0L,One Piece DriveLine,Warn Jeep hubs,Dana 35 4.10,BW1354,M50D-R1,Dual Piston Calipers, 10" Drums, Explorer Seats/Console
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Old 05-06-2012, 10:36 PM   #3
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Stick with the motorcraft. Neither of my BIIs ran worth a darn on anything other than motorcraft plugs.
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Old 05-06-2012, 11:20 PM   #4
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I got a really good deal from RockAuto on Bosch Platinum plugs (like 75 cents each!) that I put in my old 2.9. Of course it made no difference at all how it ran but I had no problems. I have almost always run Autolite plugs in everything else I have with no ill effects. A plug is a plug to me.
1986 Ranger XL 4x4, 302, NP435/205, HP D44, RCV shafts, 8.8 Lock-rite/lsd, 4.10 gears, 35" Kevlar MT/R --- Build Thread
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Old 05-08-2012, 08:14 AM   #5
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MOTORCRAFT, comparing them to autolites nowadays is like comparing apples to oranges.Usually a cheaper part is simply that, a cheaper part. notice the word "usually"
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