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#1 (permalink) |
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Registered User
Join Date: Mar 2008
Location: Dirty Jersey
Posts: 1,406
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Why Bosch Plugs Suck!
I read the part of the manual that says to only use dual electrode plugs but apparently skipped over the part that says to use Denso or NGK. I had a P0305 cylinder 5 misfire and found that the Bosch Platinum plug had both electrodes burned off. These are rated for 60k miles and only had 38k miles on them.
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'00 4Runner Limited 4x4 3.4 L V6 w/ Rear Differential Locker "Once banned, twice shy" |
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#2 (permalink) |
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Icelandic Toyotiac!
Join Date: Oct 2006
Location: Iceland, Seltjarnarnes
Posts: 426
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Interesting, I'll take it as the plug on the right is the bosch one, right?
Looks like the thread to it has been abit lose, at least all that soot shouldn't be there, and the cathode looks burned and melted... I suppose it's an isolated case, no? Never used bosch one's and I wont be changin' these things for the next few million miles in my Runner *grin*
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- Sinc, Ulfr ---------- Rigs: Undanfari I - '90 4Runner V6 38" - 1"/2" lift - rollover, in rebuild Undanfari II - '94 4Runner TD 44" - 3"/3" lift - The daily driver. ;) Undanfari II's gallery Mitzy - '90 MMC Colt 1.5I4 |
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#3 (permalink) | |
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Registered User
Join Date: Mar 2008
Location: Dirty Jersey
Posts: 1,406
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Quote:
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'00 4Runner Limited 4x4 3.4 L V6 w/ Rear Differential Locker "Once banned, twice shy" |
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#4 (permalink) |
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Super Moderator
Join Date: Jan 2008
Location: Metro ATL & Cape Coral, FL
Posts: 5,848
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On the Denso's I just put in the box congratulated me for purchasing the finest plugs made... I know that's a combo of marketing, arrogence but there is truth in the claim.
In my entire life I have had good and bad experiences with all brands of plugs except Denso and NGK, just good with those two. Good luck and FYI: I just put in the Iridium Denso into my '07 V6 and couldn't be happier.
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Chris 07 Salsa SR5, 4wd Cyclone pre-cleaner , Aux Transmission Cooler, Hidden Hitch 70779 (600/6000lbs, WDH=730/7300lbs), AirLift 1000, FJCruiser front springs (& now rear too!), Axle Vent Mod, Swaybar Bushing Upgrade, V6 Tick Reduction, VSC off mod, Maplight Mod, 255/75/17 Goodyear Wrangler SAs, Tailpipe Mod |
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#5 (permalink) |
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Registered User
Join Date: Mar 2008
Location: Dirty Jersey
Posts: 1,406
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Yeah I always used NGK in my dirt bikes and jetskis. NGKs are in the Runner now and I can't remember why I got the bosch plugs in the first place
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'00 4Runner Limited 4x4 3.4 L V6 w/ Rear Differential Locker "Once banned, twice shy" |
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#6 (permalink) | |
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Super Moderator
Join Date: Jan 2008
Location: Metro ATL & Cape Coral, FL
Posts: 5,848
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Quote:
I've done it too... I attribute it to a momentary lapse of reason; not unlike 2am at a bar
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Chris 07 Salsa SR5, 4wd Cyclone pre-cleaner , Aux Transmission Cooler, Hidden Hitch 70779 (600/6000lbs, WDH=730/7300lbs), AirLift 1000, FJCruiser front springs (& now rear too!), Axle Vent Mod, Swaybar Bushing Upgrade, V6 Tick Reduction, VSC off mod, Maplight Mod, 255/75/17 Goodyear Wrangler SAs, Tailpipe Mod |
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#7 (permalink) |
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Registered User
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Now for the Happy news, those burnt off electrodes had to go somewhere......Hoefully they arent doing any damage. I had crappy luck with the Boschs on other Yotas and wont run them but on a Small block Chevy Carb they worked fine for me though. I will be doing the Denso plugs myself soon along with Factory OEM wires.
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1998 T4R SR5 K&N FIPK, S.S 1.2 rear only, All-Pro front coils and UCA, All Pro Sliders, Baja Rack, Custom rear bumper, 285/75/16 NTG's on Ivan Stewarts. Aussie Locker and 1st gen roll bar mod. Still need front bumper w/ winch and skids. |
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#8 (permalink) | |
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Registered User
Join Date: Mar 2008
Location: Dirty Jersey
Posts: 1,406
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Quote:
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'00 4Runner Limited 4x4 3.4 L V6 w/ Rear Differential Locker "Once banned, twice shy" |
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#9 (permalink) |
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Registered User
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Sorry maybe shouldnt have pointed that out. I honestly hope that they slowly disentigrated and didn't harm anything.
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1998 T4R SR5 K&N FIPK, S.S 1.2 rear only, All-Pro front coils and UCA, All Pro Sliders, Baja Rack, Custom rear bumper, 285/75/16 NTG's on Ivan Stewarts. Aussie Locker and 1st gen roll bar mod. Still need front bumper w/ winch and skids. |
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#10 (permalink) |
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Registered User
Join Date: Dec 2008
Location: Siletz.OR
Posts: 1,284
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and this is why everyone one should use only ngk or oem denso not bosch or fram or anything other crap
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98 4runner sr5 3.4L 5spd 4x4 e-locker Clicky For Mods |
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#11 (permalink) |
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Im Opinionated mmK?
Join Date: Apr 2008
Location: North Jersey
Posts: 1,833
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The quality of EVERY Denso OEM component in the 4R blows EVERYTHING after market out of the water. Including plugs, oil filters, and the entire ignition system.
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| 2007 V8 SE | 265/70/17 BFG KO's | Complete Alpine + Kenwood Audio System | 20% Front, 5% Rear Tint | M1 All Around | |
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#12 (permalink) |
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Registered User
Join Date: Mar 2008
Location: Dirty Jersey
Posts: 1,406
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That's exactly what should be pointed out! It proves that inferior products have consequences if you choose to use them. Bosch makes some of the best power tools I've used, but they completely fail when it comes to spark plugs. Hopefully my 33% plug failure rate will show others why Denso and NGK are the only plugs that should be used
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'00 4Runner Limited 4x4 3.4 L V6 w/ Rear Differential Locker "Once banned, twice shy" |
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#13 (permalink) | |
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Snowflake, Guns, & Texas!
Join Date: Nov 2002
Location: Texas
Posts: 11,905
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Quote:
Thanks.
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#14 (permalink) | |
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Registered User
Join Date: Mar 2008
Location: Dirty Jersey
Posts: 1,406
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Quote:
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'00 4Runner Limited 4x4 3.4 L V6 w/ Rear Differential Locker "Once banned, twice shy" |
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