Tim240z Posted November 16, 2005 Share Posted November 16, 2005 Did a tune up on the truck....new cap, rotor, wires,plugs etc etc. Drove it for a few days, then did some work trying to get rid of a DTC, so I was tracing wires and testing connectivity between the PCM plugs and the Coil Module connectors etc. Everything tested fine, so I plugged everything back together, then the truck would only run for a few seconds, then die. I have spent days going over every system, harness, plug etc etc and to no avail. Decided to pull the plugs and check them out...they looked wierd...wetted and carboned.....so I threw in a set of Champions and she runs like a top! Never again will I put those platinum fancy smancy plugs in again......They were all the parts store had....next time, off to another store......3 days wasted!!! Quote Link to comment Share on other sites More sharing options...
JMortensen Posted November 16, 2005 Share Posted November 16, 2005 That's been my experience too, but then you get some people that swear by them. Seen posts here saying how great they are. Quote Link to comment Share on other sites More sharing options...
HarrisonTX Posted November 16, 2005 Share Posted November 16, 2005 I had some guy at auto zone tell me this.. I was gettin plugs for the girls '97 s-10, and auto zone "recommended" bosch platinum 4's, they were $6 a piece, and they guy said, Well, if you want optimum performance, this is the only way to go, The truck wont run right it you get the champs.. I got the champs.. I never got to try them because i COULD not get the wire off the number 1 plug, never had anything stuck like that before.. Quote Link to comment Share on other sites More sharing options...
Sparky Posted November 16, 2005 Share Posted November 16, 2005 I used them a few times with mixed results. it seemed that I would need to replace them more frequently than the el cheapo plugs I used to get in my plymouth and bimmer...they only thing I've ever put in my Z are NGKs Quote Link to comment Share on other sites More sharing options...
PeterZ Posted November 16, 2005 Share Posted November 16, 2005 Platinum plugs seem to work best on newer cars with good engine management systems. I also have had poor performance from the platinum plugs on early FI systems (BMW, Datsun) and on carbureted engines. Quote Link to comment Share on other sites More sharing options...
Hybrid240z Posted November 16, 2005 Share Posted November 16, 2005 I'll never use platinum plugs again. Tried them once. I always buy NGK. Quote Link to comment Share on other sites More sharing options...
myplasticegg Posted November 16, 2005 Share Posted November 16, 2005 Ohhhh yeah... there was a study in the late 90's proving that the tips break off when they are under boost. FUN! champs or NKG's for me! Quote Link to comment Share on other sites More sharing options...
DaleMX Posted November 16, 2005 Share Posted November 16, 2005 I agree, I tried them in my TPI with no success, then in a 85 5.0 stang and they failed, had to pull them and replace them with NGK's in both cars. FWIW I run NGK TR55's in the LS1 and they stay clean. Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted November 16, 2005 Share Posted November 16, 2005 since newer efi cars can be picky i always put the oem plugs back in.ac/delco in gm,motorcraft in ford,ngk in jap cars.i hate going to places like kragens.the help is just 1 step up from working at fast food places.if they cant find it on thier computor your screwed. Quote Link to comment Share on other sites More sharing options...
Mike C Posted November 16, 2005 Share Posted November 16, 2005 I ran Bosch platinums in my '84 Corvette. Car ran GREAT for about three weeks. Then I noticed a miss. And then it rally started running rough. It had a new coil, wires, and the plugs. WHen I pulled the plugs, one of the center electrodes had slipped out and shorted to the ground strap! If it had been a multi-electrode plug, I'd have had a very hard piece of platinum scoring the cylinder wall. Two of the other eight had slipped but had not grounded. I will NEVER buy Bosch plugs again. I have run other platinum plugs from NGK and Autolite with good success. But IMO, best bang for the buck are the Denso u-groove plugs. About $1.19 each at Autozone. Quote Link to comment Share on other sites More sharing options...
80LS1T Posted November 16, 2005 Share Posted November 16, 2005 Working at a dealership I see this a lot. People think just because the plug cause $6-10 per plug that it should last forever and run like a Ferrari! Most common thing is people do their own tune up with Bosch plugs and then 5-10,000 miles later its misfiring and then it comes in for a check engine light and running rough. We tell them they need to put OEM plugs back in and get rid of the Bosch and they think we are crazy. But guess what, it fixing it every time! Platinum plugs should be used in vehicles designed for platinum plugs. Plan and simple, why change to a different plug if you havent changed anything on the engine(like perfomance wise...), since the factory did the tuning with that plug? I personally will nevery use a Bosch plug in anything I own, I think they are just plain-ole shitty plugs. Guy Quote Link to comment Share on other sites More sharing options...
Moridin Posted November 16, 2005 Share Posted November 16, 2005 I think the mini-van we used to own had 100,000 Bosch platinums in it. Ran pretty well for 100,000 until the engine had to be lowered for them to be replaced (in conjuction with a new tranny). The only fancy-pancy plugs that I know that work are the NGK Iridiums. Work pretty well in all my experiences. Quote Link to comment Share on other sites More sharing options...
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