Bosch plus 4's do they suck???
TECH Enthusiast
Joined: Oct 2002
Posts: 739
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From: houston,texas
Re: Bosch plus 4's do they suck??? Well they worked for me... 
...I like them and I like the fact that you don't have to replace them sooner than cooper I believe but its mostly up to you and the maintanance of your car........But I heard iridium ones are better so I'll try those.....just my 02 cents... 
...I like them and I like the fact that you don't have to replace them sooner than cooper I believe but its mostly up to you and the maintanance of your car........But I heard iridium ones are better so I'll try those.....just my 02 cents... 
TECH Resident
Joined: Nov 2002
Posts: 996
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Re: Bosch plus 4's do they suck??? I has bosch +4s in my car for a few weeks. With my stock cam I saw a number of misfires at idle... I went with NGK TR-55s, no mroe misfires. It only takes an hour to swap plugs, NGKs are my choice...
Tommy
Tommy
Re: Bosch plus 4's do they suck??? Stay away from anything bosch. i work for a dealer, and we constantly throw those things out for misfire complaints. definately go ngk over those pieces of crap any day.
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Launching!
Joined: Mar 2003
Posts: 207
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From: kansas
Re: Bosch plus 4's do they suck??? No problems from Bosch +4 from me. Had them since the odometer read less than 2000. Now at about 70000, they still run like new but I'm changing them for the iridium NGK's, just 'cause I can.
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TECH Fanatic
Joined: Jun 2003
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From: Further South than Hell
Re: Bosch plus 4's do they suck??? I have DENSO iridium they are great. NGK's better if u have NOS or blower. I took mone off to read after 15 k and they were as new with excelent color. 
TECH Apprentice
Joined: Oct 2002
Posts: 310
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From: san Antonio
Re: Bosch plus 4's do they suck??? STAY AWAY FROM THE BOSHCH PLATINUMS!!!!!!!! I've worked at an Advance Auto Parts now for over 2 years...and these suck...customers bring these in all of the time for being defective...I recommend the TR55's to everybody and so far no problems...TR6's if you have any type of power adders...take them out and return them...they have a 5 year warranty and the store should take them back...if not drop me a pm
On The Tree
Joined: Jun 2003
Posts: 148
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Re: Bosch plus 4's do they suck??? I'm glad to see not everyone is brainwashed by Bosch's BS. If you talk to people who really know their stuff, like people working in the field everyday, they'll tell you these plugs suck. Don't listen to your ricer buddy down the street who'll buy anything that's bright and shiny.
TECH Regular
Joined: Jan 2002
Posts: 400
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From: Lincoln Park Mi
Re: Bosch plus 4's do they suck??? THe +4's worked great for me when the motor was stock, no misfiring, yes I autotapped it.
since geting a cam though I have been getting some KR, think it may be from the plugs being too hot, heard of others having that same problem. went to TR6's the other day, havent had a chance to A tap yet though...
since geting a cam though I have been getting some KR, think it may be from the plugs being too hot, heard of others having that same problem. went to TR6's the other day, havent had a chance to A tap yet though...
Originally Posted by malibu350
STAY AWAY FROM THE BOSHCH PLATINUMS!!!!!!!! I've worked at an Advance Auto Parts now for over 2 years...and these suck...customers bring these in all of the time for being defective...I recommend the TR55's to everybody and so far no problems...TR6's if you have any type of power adders...take them out and return them...they have a 5 year warranty and the store should take them back...if not drop me a pm
I can not tell you how many "do it yourselvers" use these plugs and bring their car to our shop with misfire codes/skipping problems. I love these plugs
Harder metals (platinum, iridium) hold more heat, or at least dissipate it slower...
I don't know how much of a performance difference it would make, but I've been running the regular NGK's. If I have to change them more often, it just gives me a reason to check out the top half of my motor really well for about an hour or so (and then when I finish with #8, I can move on to the others)
Maybe that misfiring is pre-ignition cause of a hot plug?
I don't know how much of a performance difference it would make, but I've been running the regular NGK's. If I have to change them more often, it just gives me a reason to check out the top half of my motor really well for about an hour or so (and then when I finish with #8, I can move on to the others
)Maybe that misfiring is pre-ignition cause of a hot plug?
Staging Lane
Joined: Jan 2004
Posts: 98
Likes: 0
From: NW Houston, TX
I put in TR55s and my throttle response when down the drain .... sluggish & unresponsive..... put it in the Bosch +4s and it picked right up again & better than the factory AC Delco platinum plug ...
i dont see all the hype with the TR55
changing plugs 3 times in a weekend is not my idea of fun
i dont see all the hype with the TR55
changing plugs 3 times in a weekend is not my idea of fun