Bosch +4 Plugs...again... - Page 3 - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #51  
Old 08-11-2008
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4 there not mad for a 50 shot or any shot for that mater
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  #52  
Old 08-16-2008
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they did ****ty in my 3.0 untill i used motorcraft...seemed like it wasnt running right...odd but when i replaced them with the motorcraft it ran smoother.. im using motorcraft in my 4.0 too.they are made for ford trucks and cars so..why not.
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  #53  
Old 09-08-2008
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My +4's are still working like a champ.
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  #54  
Old 09-12-2008
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Originally Posted by Prerunner-Ranger View Post
My +4's are still working like a champ.
Mine too. No problems whatsoever.
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  #55  
Old 09-13-2008
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I'm using denso IT-20s and it's never been so smooth. (I'd suggest a IT-16 for you non-boosted guys. Which btw, I'll be using during the non-racing times of the year)

See my web page

Last edited by wydopnthrtl; 09-13-2008 at 06:57 AM.
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  #56  
Old 09-13-2008
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Motorcraft is the only plug that has heat range optimized for each engine in 2006 Rangers. SP439 for 2.3L, SP432 for 3.0L, and SP412 for 4.0L. Denso, NGK, and Bosch all call out only one part number for all three engines.
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  #57  
Old 09-13-2008
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i have a question about these plugs... i have seen them but have NO experience with them as we only use motorcraft and autolite at work.

what is the advantage that bosch claims having 4 ground straps instead of one? it cant spark to all 4 at the same time(i wouldnt think, knowing that electricity always takes the path of least resistance, it would jump to only one of the straps). so i really dont see an advantage.

not trying to start an argument, just seeing if someone has some insight on this. again i have NO experience with them.
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  #58  
Old 11-12-2008
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Just an update 7months problem free...
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  #59  
Old 11-12-2008
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50K miles on my Bosch Platinum 4s with no problems. I will be switching to NGK or Denso Iridium on the next set.
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  #60  
Old 11-12-2008
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Quote:
Originally Posted by quicksilver2001 View Post
i have a question about these plugs... i have seen them but have NO experience with them as we only use motorcraft and autolite at work.

what is the advantage that bosch claims having 4 ground straps instead of one? it cant spark to all 4 at the same time(i wouldnt think, knowing that electricity always takes the path of least resistance, it would jump to only one of the straps). so i really dont see an advantage.

not trying to start an argument, just seeing if someone has some insight on this. again i have NO experience with them.

electricity only needs ONE path to ground, not four.

there is no advantage to using these plugs. thats all i have to say.
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  #61  
Old 11-12-2008
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two pages and six months later, still a Bob like response lol
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  #62  
Old 11-12-2008
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Well there may be no improvement but we proved that they don't cause any problems like everyone says they do.
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  #63  
Old 11-12-2008
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^^^^in Your trucks.

Others have had different results. Personally I don't think it's the +4s that cause the problems. In more recent years, I have run into poor quality control with Bosch plugs in general. I have found a lot of plugs that are leaking compression and blowing fire around where the ceramic enters the base, right out of the box. The worst scenario was when I had to get 18 Bosch Platinum plugs to get 8 that worked for a tune up on a Mountaineer 5.0. Thats just poor QC.
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  #64  
Old 11-12-2008
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You know, I think its funny when threads like this come up in different forums. Theres always somebody who says "take them back to the nimrods behind the counter that sold them to you and tell them your truck runs crap". You know, I work in a parts store and have for a while now. Its amazing some of things your hear people say. Just this week I had a guy who said "yeah these bosch plus 4's are the best plugs on the planet" and he bought some. So does me selling him what he asked for make me a nimrod? I think its pretty funny when I hear somebody say that, when all most parts people do is sell people the stuff they ask for.-Just my two cents.
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  #65  
Old 11-13-2008
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Originally Posted by fddriver02 View Post
Well there may be no improvement but we proved that they don't cause any problems like everyone says they do.
The ones that have had problems with Bosch plugs out number the ones that claim not to have had a problem, and even you agree there is no improvement with them, so why take a chance on using them?

Bosch plugs were the cause of a misfire problem with my Ranger when I bought it (previous owner had just installed them).
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  #66  
Old 11-13-2008
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Quote:
Originally Posted by Takeda View Post
The ones that have had problems with Bosch plugs out number the ones that claim not to have had a problem, and even you agree there is no improvement with them, so why take a chance on using them?

Bosch plugs were the cause of a misfire problem with my Ranger when I bought it (previous owner had just installed them).
Because I thought there would be some improvement. Guess not. It's called trial and error.
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  #67  
Old 11-19-2008
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I got +2 in mine and saw a 5mpg gain but of course 3 out of the 6 were shoot to hell but i saw and felt the gains out of the +2
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