Does anybody know if Bosch makes the Plat. + 4 spark plugs for the 1999 4.2 V-6? I've tried everywhere in town that carries Bosch and nobody has them.

 

Gotcha covered here. AUTOZONE carries the full line of +4 plugs for the 4.2, 4.6, and 5.4L V Motors....I recommend the double platinum Motorcraft however...

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1997 F-150 Reg. Cab/Short Box, 4.2L, Auto 3.31 Rear, Black/Silver

 

Katmandu- I tried Autozone and they said that they don't have them out for the 1999 4.2 yet. I asked them if the +4's for the 1998 would work and they said no. I'm gonna call Bosch today and see if they are available for the 4.2 yet.

 

Hey Kat,
So tell us all - why the Motorcraft plugs? What is it about these plugs do you like? Personally, I like using Ford parts whenever possible. Let us know what you think.

Thanks in advance.

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1998 F150 xl reg. cab, 4.2L, 3.55
gear, auto, Lund tonneau bed cover, Pioneer CD receiver, EVERYTHING on the truck is black(including bumpers, grille, handles), aluminum wheels, K&N filter, Belltech 2" rear drop.

 

HEY U MAY WANT TO L@@K AT SPLITFIRE PLATINUM 3`S THEY ARE TRIPLE PLATINUM PLUGS. BETTER THAN FACTORY PLUGS,THEY HAVE 3PLAT.`S INSTEAD OF 2. PRICE WISE THEY COST $6.00 EACH MOTORCRAFT PLUGS ARE $6.00 PLUS IN MOST AREAS. I CHANGED MY TRUCK`S PLUGS AT 39,000 AND HAVE BETTER RESPONCE IN THE GAS PEDAL. AND RUNS ALOT BETTER TOO. BOSCH+4 ARE NOT BUT A SINGLE PLATINUM PLUG.

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The Bosch plugs don't need platinum tips on the 4 electrodes. Electricity takes the path of least resistance. Once one of the electrodes wears down, the spark will jump to the next and so on. You'd think the Bosch plugs would last forever. Is this a good guess? LOL

 

I have about 7K on my 99 f150 5.4l V8

Is there any benefit to changing to platinum plugs now, or should I just wait another 20-30k miles?

thanks

 

The trucks come from the factory with platinum plugs. Ford says they can go about 100,000 miles. I'm changing mine at about 40,000. Go ahead and run your a while longer.

Neal

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1997 4x4 Expedition- 4.6L, true dual exhaust w/glass-packs, K&N air filter, SuperChip, airbox mods, Edelbrock shocks, 285/75R16 BFG ATs, Optima "T-Bone" wheels, and Clarion In-dash CD player.

1993 4x2 F150 Reg. Cab LWB- 5.0L, cat-back dual exhaust w/glass-packs, K&N air filter, Superchip, fresh paint, and Line-X bedliner.
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