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I own a 2003 SE(42,000 miles).

Is it safe to use Bosch quad tip platinum plugs?

I have used them with significant power & fuel econo improvement in my wife's Mitsi Galant.

I am assuming ford engins to be quite delicate based on previous experience (93 Escort).

Thanks.
 

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I've heard nothing but bad news on the boards about bosch plugs in a zetec. I have no personal experience, though.
 

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The heat range of the Bosch plugs is the problem, and Autozone's computer. They seem to be giving people SPI plugs for Zetecs and that doesn't work.

I'm an anti-super plug guy myself. No matter how many diodes you have- there is only going to be one spark because electricity will always follow the path of least resistance to ground. Also platinum is not used in spark plugs for it's conductivity, but for it's anti-corrosive and heat resistance. I think that cheaper plugs with copper cores in the right heat range, and changed within 20k are the best route to go.
 

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That...and the fact that REAL performance plugs have smaller ground and center electrodes. That multi-ground stuff might be good for an airplane or something where reliability is more important than power. For power, they're a total joke...they're an "anti-power" mod. :)
 

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Hey guys do any one of you know the part number for the motorcrafts or autolites copper plugs for the zetec in the same heat range that is stock.
 

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Go to WallyWorld and check the book. I Just got Autolite 104 plugs for mu 2.3 Duratec, but gapped then at .060. Replaced the 100K mile platinum. Wasn;t having a problem, just wanted to replace them. No change in performance. Keep in mind, new plugs will never give you "a lot more power" They may only replace the power and smoothness you may have lost because the old ones were poor.
 

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Dont waste your money!
 

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Stock motorcraft platinums are the best to use...second choice would be autolites. I ahve had great luck with both.....I had horrible luck with platinum bosch (any # tips) and iridium plugs (they are ok while your racing, not daily driver)...
 

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I tried the Bosch quad tips quite a few years ago in my Explorer. I found little performance difference. If anything, the performance was slightly worse, but since I really had no quatifiable comparitive measurements, I can't say for sure. But I went back to platinum Autolites and have used them ever since.
 

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Do not buy Bosch, I purchased them and screwd with my computer. So i purchased NGK Laser plugs. 18.00 bucks each..

Just buy factory plugs and save your self some money.
 

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i work at autozone, and anyone who comes in witha zetec i let them know that I own one and I would never put those in my car and they will screw with your car...Everyone in my district seems to call me for any focus questions and problems that they are having...But, i never suggest putting bosh anything in your car...Im running autolite double platnuim, only because they were on sale...But if you have questions...Autozone carrys both Motorcraft and Autolite plugs...
 

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i ran bosch single platnums or w/e in my car, the tard butt at autozone gave me the wrong plug for my car, werent even FOR my car...car ran like a retard on nyquill everyday till i changed them, *big fake smile and 2 thumbs up* THANKS AUTOZONE!
 

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Doesn't it not say in your manual not to use Bosch? I took my bro's advice, who works on cars a lot and picked up Bosch, and yeah, they sure messed with my car. Than I went to NGK Lasers.
 
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