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Ok, i hate to start a new thread on plugs, but here goes. I tried the Plat 4's and they do indeed suck. Everything is there but the power. Every mechanic and tech that i could find agrees that these plugs suck for this car. Not to say that they will not do fine in other setups. But for us they are not a good plug. So i went with the Autolite Double Plats.
This should make it easy for anyone searching for info on these plugs. I can feel the flames now from all of the people who "never had problems from the Plat 4's". Well flame away because they suck. You will find out soon.

Ash
 

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I heard also somewhere that they suck for this car, I don't care for them anyway. Used em in my prove and they actually helped out, this was a 2.0 four banger though. I heard the NGK Iridium IX or w/e were better than the platinums.
 

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the simple facts about spark plugs for our cars

- Having more than one electrode is not proven to produce any more power

- The plugs must be platinum on both the anode and cathode because the banks of spark plugs fire oppositly

Now a perfectly new set of Bosch 4+ will work just fine, but soon you'll start to degrade the plugs on one bank of the engine, and you won't be getting as good a spark to three of six cylinders. If you changed your 4+'s every other oil change then they'de work just fine, but that would be a stupid waste of money
 

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I have had the +4's on my car for over a year now. I am not saying they are great but i have not had any problems with mine to date. Therefore i am happy with them, at least to this point.
 

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Read this post Basicaly short version...if they aren't the autolite/motorcraft double plats the engine will just eat em up. It is designed for these plugs and these type of plugs ONLY. Sure the car will run with other plugs but then you might be running hotter than the engine is designed to run...beleive me this is not good...been there done that on an old car and the dealer get this voided warranty due to the Bosch Plat 4+ plugs...said that they caused the engine to run too hot and that was what was causing me to foul out my plugs...and even melted a plug wire...and no it wasn't hitting the block actually melted just off the boot...Do yourself a favor and just use the double plats...
 

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So I need the stock units from a dealership then? Ive had the Bosch+4s for damn...like 70K miles prolly and havent burned any plugs wires or anything. I have 92,000 miles on mine. I have been wanting to change the plugs soon anyway so what is my best option (part numbers would be very helpful) or just the factory spec plugs and forget about it? Also, my car dynoed very well against similarly equiped cars at cougarfest so I dont think they are hurting performance...engine wear...maybe, no way to tell from the outside though. Not defending Bosch, just saying that I have driven a ton of hard miles on them and they have been fine. Now I look to something new.
 

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I have Bosch Plat. +4's in my car and I CAN feel a HUGE difference. I replaced them a couple weeks ago and have not noticed any engine drop in the power aspect. I talk with a couple mechanics and they had nothing bad to say about the plugs at all. Said they were the best to put in my car for performance. I only run premium fuel and a little Outlaw every other fill up. Car has 55K on it and no probs yet.
 

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I have a friend who had +4's in his Jeep. He said one of his cyclinders wasn't firing to well and he decided to pull the plugs to see if it was coated in gas. What he found was that a piece of cermaic had broken off the plug and was lodged in the gap. He lucked out big time. Needless to say, he ain't running +4's no more...

-Nick
 

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Originally posted by: MrFroge
Once more for those who just don't get it..:confused: null
:goofy:

THIS IS THE REASON WHY THE BOSCH +4's DO NOT WORK FOR AN EXTENDED PERIOD OF TIME, PEOPLE.

LOOK AT THE DAMN PICTURE.

Half of the spark plugs fire from anode to cathode in our motors, and the other half of them fire from cathode to anode. Now, if you don't have platinum on both ends, over time you will burn out half of the plugs. It's just how our ignition works. There's nothing more to be said about it. 95% of the 'platinum plugs' out there only have platinum on pole, not both.
 

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Originally posted by: NorCalCoug
Originally posted by: MrFroge
Once more for those who just don't get it..:confused: null
:goofy:

THIS IS THE REASON WHY THE BOSCH +4's DO NOT WORK FOR AN EXTENDED PERIOD OF TIME, PEOPLE.

LOOK AT THE DAMN PICTURE.
Amen

People if you don't believe what we are trying to say here, you might as well not even bother reading the forums....

There is absolutely no room for debate here. The experts agree. If you don't agree, your not anything even close to an expert.
 

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Thanks for the info. Which NGK plugs? Do they have them at Autozone and if so do I just ask for 6 NGK double platinum plugs? Is there more than one type of them and do I need two different types like the stock ones are? (BTW- Ive pulled all 6 before and there was no difference between front and rear banks- however, I have had my rear bank precats replaced so perhaps there was a contributing factor there.. Ive had too many air/fuel issues with this car to blame the plugs for certain)
 
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