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post #1 of 18 (permalink) Old 03-04-2007, 08:31 AM Thread Starter
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Bosch Platinum Spark Plugs

I replaced the factory champions with Bosch Platinums yesterday. Would have preferred NGK Platinums, but all they had were the $10 plugs, so I went with the $2.50 Bosch.

3 reasons why I am GLAD I did this.
1. Champion plugs are against my religion
2. The factory does NOT use any kind of anti-seize, and the plugs came out so dry that I had to go very slow for fear of heating up the aluminum threads in the block and damaging them.
3. The stock plugs were suprisingly worn at 9500 miles, and diddnt look too great. In fact they had a greenish residue on them...... Gaps were big, but at least consistent at .46

As per my ritual, each new sparkplug received the silver antiseize on the threads, was torqued to 2lbs, and dielectric grease on the cap. I also put a dab of the grease on the coil connectors.

Suprisingly, when I started the Commander up, it threw a check engine light..... I'm thinking great..... Engine was smooth, no missing, but something was up. So I disconnected the battery and reset the computer by holding the key on start for 30 seconds. **THIS IS THE RIGHT/FAST WAY TO DO THIS, NO reason to have to wait 30 minutes as some say. Restarted and no CEL. Drove about 60 miles last night, no real difference in feel, other than a bit smoother feel to the motor (psycho somatic) Fuel mileage seems to be 1-2 better highway, and 3 city, but will weigh in after a full week.

2006 Commander 4.7 w/ QTII
2005 Subaru Outback 3.0R VDC (the wife's ride)
1986 Olds 442
1976 Porsche 912 E
(being resurrected)
2005 Yamaha FJR 1300
1979 Yamaha XS1100
1978 Yamaha XS750
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post #2 of 18 (permalink) Old 03-04-2007, 08:31 AM Thread Starter
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Bosch Platinum Spark Plugs

I replaced the factory champions with Bosch Platinums yesterday. Would have preferred NGK Platinums, but all they had were the $10 plugs, so I went with the $2.50 Bosch.

3 reasons why I am GLAD I did this.
1. Champion plugs are against my religion
2. The factory does NOT use any kind of anti-seize, and the plugs came out so dry that I had to go very slow for fear of heating up the aluminum threads in the block and damaging them.
3. The stock plugs were suprisingly worn at 9500 miles, and diddnt look too great. In fact they had a greenish residue on them...... Gaps were big, but at least consistent at .46

As per my ritual, each new sparkplug received the silver antiseize on the threads, was torqued to 2lbs, and dielectric grease on the cap. I also put a dab of the grease on the coil connectors.

Suprisingly, when I started the Commander up, it threw a check engine light..... I'm thinking great..... Engine was smooth, no missing, but something was up. So I disconnected the battery and reset the computer by holding the key on start for 30 seconds. **THIS IS THE RIGHT/FAST WAY TO DO THIS, NO reason to have to wait 30 minutes as some say. Restarted and no CEL. Drove about 60 miles last night, no real difference in feel, other than a bit smoother feel to the motor (psycho somatic) Fuel mileage seems to be 1-2 better highway, and 3 city, but will weigh in after a full week.

2006 Commander 4.7 w/ QTII
2005 Subaru Outback 3.0R VDC (the wife's ride)
1986 Olds 442
1976 Porsche 912 E
(being resurrected)
2005 Yamaha FJR 1300
1979 Yamaha XS1100
1978 Yamaha XS750
[/B]
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post #3 of 18 (permalink) Old 03-04-2007, 10:38 AM
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Re: Bosch Platinum Plugs

I have used Champion P/N 4412 truck plugs in my three 4.0L jeeps for years and been very satisfied with them. I change them every 12k miles though not really necessary.
I dont yet know what is the best plug for the HEMI 5.7 but it takes 16 of them so I hope not something real expensive. John
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post #4 of 18 (permalink) Old 03-04-2007, 07:20 PM
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Re: Bosch Platinum Plugs

Are you using the Bosch single-prongs? Or the two or four prongs?


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post #5 of 18 (permalink) Old 03-05-2007, 01:58 AM
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Re: Bosch Platinum Plugs

Quote:
Originally Posted by Bulldog9
I replaced the factory champions with Bosch Platinums yesterday. Would have preferred NGK Platinums, but all they had were the $10 plugs, so I went with the $2.50 Bosch.

3 reasons why I am GLAD I did this.
1. Champion plugs are against my religion
2. The factory does NOT use any kind of anti-seize, and the plugs came out so dry that I had to go very slow for fear of heating up the aluminum threads in the block and damaging them.
3. The stock plugs were suprisingly worn at 9500 miles, and diddnt look too great. In fact they had a greenish residue on them...... Gaps were big, but at least consistent at .46

As per my ritual, each new sparkplug received the silver antiseize on the threads, was torqued to 2lbs, and dielectric grease on the cap. I also put a dab of the grease on the coil connectors.

Suprisingly, when I started the Commander up, it threw a check engine light..... I'm thinking great..... Engine was smooth, no missing, but something was up. So I disconnected the battery and reset the computer by holding the key on start for 30 seconds. **THIS IS THE RIGHT/FAST WAY TO DO THIS, NO reason to have to wait 30 minutes as some say. Restarted and no CEL. Drove about 60 miles last night, no real difference in feel, other than a bit smoother feel to the motor (psycho somatic) Fuel mileage seems to be 1-2 better highway, and 3 city, but will weigh in after a full week.
Very interesting. I just turned 6000 miles on my Commander. I'm looking forward to a follow-up post from you on how it's going.
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post #6 of 18 (permalink) Old 03-05-2007, 07:44 AM Thread Starter
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Re: Bosch Platinum Plugs

Quote:
Originally Posted by webjones
Are you using the Bosch single-prongs? Or the two or four prongs?
I used the single prong (looks similar to a standard plug) I dont like the open electrode design. I think Bosch sells them in 2, 3 & 4 electrode designs.

2006 Commander 4.7 w/ QTII
2005 Subaru Outback 3.0R VDC (the wife's ride)
1986 Olds 442
1976 Porsche 912 E
(being resurrected)
2005 Yamaha FJR 1300
1979 Yamaha XS1100
1978 Yamaha XS750
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post #7 of 18 (permalink) Old 03-05-2007, 07:31 PM
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Re: Bosch Platinum Plugs

Quote:
Originally Posted by Bulldog9
1. Champion plugs are against my religion

As per my ritual, each new sparkplug received the silver antiseize on the threads, was torqued to 2lbs, and dielectric grease on the cap. I also put a dab of the grease on the coil connectors.
Champion is horrible, but they are the best plug for two engines, Mopars and Briggs&Stratton. They dont run well in anything else, but are perfect for those two. DCX does seem to be moving to NGKs in a lot of the newer engines though.

2lbs was a typo, right?
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post #8 of 18 (permalink) Old 03-06-2007, 05:22 AM Thread Starter
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Re: Bosch Platinum Plugs

Quote:
Originally Posted by ktek01
Champion is horrible, but they are the best plug for two engines, Mopars and Briggs&Stratton. They dont run well in anything else, but are perfect for those two. DCX does seem to be moving to NGKs in a lot of the newer engines though. 2lbs was a typo, right?
No, the Bosch plugs have a gasket, and 2ftlbs is what they called for. It amounted to about 3/4 full turn after seated, about right.

My issue with Champions has been reliability and durability. My motorcycle's are what introduced me to NGK's

2006 Commander 4.7 w/ QTII
2005 Subaru Outback 3.0R VDC (the wife's ride)
1986 Olds 442
1976 Porsche 912 E
(being resurrected)
2005 Yamaha FJR 1300
1979 Yamaha XS1100
1978 Yamaha XS750
[/B]
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post #9 of 18 (permalink) Old 04-10-2007, 09:02 PM Thread Starter
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Re: Bosch Platinum Plugs UPDATE

Well, after 3000 miles on the Bosch Platinums in the last month (dont ask....) I have decided to pull these plugs out of my Commander. My lileage has gone in the toilet on the Highway, I used to be able to easily get 19-20 at 65-70 now I am lucky to get 17. Just made 2 runs from DC to PA to NY to DC and PA, averaged 16MPG. The engine feels smoother but WEAK, especially at startup, and it now has a lopey idle. SO today I ordered NGK copper plugs, what I planned originally, but was impatient, and got the Bosch because they were available and cheap. My MISTAKE. I went back through some old logs and files and found a note from 10 years ago stating "NEVER USE THESES again next to a service record on my Autocross GTI. Guess I forgot...........
It irritates me because my plug change goal was to get the champions out and pick up some mileage improvememnt before all this driving.... oh well.....


More to follow.

2006 Commander 4.7 w/ QTII
2005 Subaru Outback 3.0R VDC (the wife's ride)
1986 Olds 442
1976 Porsche 912 E
(being resurrected)
2005 Yamaha FJR 1300
1979 Yamaha XS1100
1978 Yamaha XS750
[/B]
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post #10 of 18 (permalink) Old 04-10-2007, 09:30 PM
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Re: Bosch Platinum Plugs

I've experienced the same thing with my NGK Iridiums, but I gapped them to .44" instead of .40", so that might be contributing to the problems. Going to regap them tomorrow and see if I pick up any mileage. If not, I'll swap the Champions back in and return the NGKs when I get back to Denver.

I also wanted to pick up some mileage for my road trip but lost it instead. And now the idle is rougher, but smoother on startup. Hopefully the gapping will help but I'm doubtful.

2006 XK Sport, 4.7l, QTII- many mods
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