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Old 08-22-2001, 06:37 PM   #1
psaeko
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Default Bosch Platinum+4 plugs

I've been hearing couple of people having problems

i have a set

should i remove it?

It seems fine at this point?
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Old 08-22-2001, 11:40 PM   #2
Peaty
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I put some in my wife's Legacy a while back and never had any problems. Been in there around 30K now. If they seem fine I say leave them alone. I use the NGK copper in my RS but I change them every year
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Old 08-23-2001, 02:24 AM   #3
SupaScooby
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Thumbs up

i've had mine in for about 10k and no probs yet.
edit: ... what kinda problems??
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Old 08-24-2001, 01:51 AM   #4
Albert
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If you get the CORRECT heat range plugs for you engine there is no problem.
**The parts counter application book might be wrong, so double check first!

There are no known problems with any BOSCH product in a Subaru.
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Old 08-24-2001, 03:26 AM   #5
psaeko
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Smile Thanks whew

Well glad to hear most people didn't have problem..
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Old 08-28-2001, 03:11 PM   #6
Dan_E
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I've had those plugs myself. I noticed the Idle is better with the NGK plugs. I have Idle issues anyways with the TEC-II, and the bosch were not helping.

As the grease monkeys once said, Don't mix Japanese with European and Vice Versa.
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Old 08-28-2001, 07:19 PM   #7
sidewayz
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hehehe...Thats funny considering that ngk's are made in North Carolina
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Old 08-29-2001, 07:32 PM   #8
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Default 4's

I'm one of those people with a problem with bosch 4's. they burnt my coil up. I don't know why. all I know is I put them in, left the drive and got CEL. pulled the plugs, put chaps in, took it to the shop and had the coil replaced.
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Old 09-01-2001, 12:54 PM   #9
psaeko
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Default So is the plugs or the setup

So was it plugs that caused problem or installation?
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Old 11-06-2001, 12:15 AM   #10
donut
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Thumbs up great plugs

i've been using the bosh +4's in my 98rs and they workgreat. i just got my car back from the dealership and they put the stock plugs in and i noticed it as soon as i left the lot. the bosh plugs rev better and idle better .
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Old 01-04-2005, 12:15 PM   #11
renderw
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Angry Garbage

I put the bosh Platinum +2’s in my subaru forester. Not good.
The parts guy recommended the +2’s over the +4’s because he had a note on his computer that the +4’s would foul in the 2.5L motor. He recommended the Bosh over the NGK
My old plugs were NGK(I found out after I bought the bosh)
My subaru now idols like a Harley… It’s fine when it revs up, and my gas mileage is the same.. as for the money back guarantee…. Not much of a guarantee.. do you know how hard it is to change plugs in a subaru.. Great I get my $20 bucks back for the plugs and now I’ve spent well in excess of $100 in labor doing the job twice!!

Subaru told me they only use NGK plugs. Funny thing the subaru mechanic said “don’t use German anything on a Subaru”
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Old 01-06-2005, 07:57 PM   #12
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....
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Old 01-17-2009, 07:51 AM   #13
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My last tuneup, less than 6k ago, i put in a set of +4's on my 02 outback sport. Since then i kep getting a lot of check engine lights that read knock sensor error, but engine runs fine save for really rough idle below 1k rpm, time to pull them or something more sinister?
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Old 11-29-2009, 01:38 PM   #14
davixxx
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'01 2.2L imp wagon. i replaced plugs and wires, all filters, oil, trans fluid, rear diff fluid, pcv... etc. last month. since i have been getting 20 per cent WORSE fuel mileage. i can attribute some of the loss to winter tires, but not all. now i've found this thread and realized i used bosch platnium plugs. anyone think they maybe the culprit?
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Old 11-30-2009, 11:13 AM   #15
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Quote:
Originally Posted by davixxx View Post
'01 2.2L imp wagon. i replaced plugs and wires, all filters, oil, trans fluid, rear diff fluid, pcv... etc. last month. since i have been getting 20 per cent WORSE fuel mileage. i can attribute some of the loss to winter tires, but not all. now i've found this thread and realized i used bosch platnium plugs. anyone think they maybe the culprit?
hmmm possibly. or maybe at least a part of the gas mileage. havent had any experience with them. NGK is what ive always put in my imports.
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Old 11-30-2009, 11:18 PM   #16
davixxx
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with the bosch in, along with the bad mileage, the car had been revving high for a few seconds after starts. after reading this thread, i pulled them and turned in the recommended ngk... starts are back to normal, and the first half of the tank is back on track for 7 liters/100.

thanks for another usefull thread... i was just a little late finding it!
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Old 12-01-2009, 01:31 PM   #17
9jhoneycutt
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denso plugs are nice too. you can get the colder heat rage or stock. they are pricey tho. fastwrx carries them for 68
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Old 12-13-2009, 02:37 PM   #18
mk2vrt
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sounds like you need a honda bro.to lazy to change spark plugs when your car is running bad?

Quote:
Originally Posted by renderw View Post
I put the bosh Platinum +2’s in my subaru forester. Not good.
The parts guy recommended the +2’s over the +4’s because he had a note on his computer that the +4’s would foul in the 2.5L motor. He recommended the Bosh over the NGK
My old plugs were NGK(I found out after I bought the bosh)
My subaru now idols like a Harley… It’s fine when it revs up, and my gas mileage is the same.. as for the money back guarantee…. Not much of a guarantee.. do you know how hard it is to change plugs in a subaru.. Great I get my $20 bucks back for the plugs and now I’ve spent well in excess of $100 in labor doing the job twice!!

Subaru told me they only use NGK plugs. Funny thing the subaru mechanic said “don’t use German anything on a Subaru”
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Old 12-31-2009, 11:14 PM   #19
feint05
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gimmick/ overated, electricity will take the path of least resistence if the is an added benifit at all, it would be that once enough carbon builds up on one contact it will automatically by sheer nature switch to the cleaner one. dont waste your money on these!
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Old 01-08-2010, 09:13 PM   #20
happs subi
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Yeah, multiple prong spark plugs aren't a great idea for our cars. The regular bosch plugs would work just fine
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