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Mad Scientist
94 scepter coupe
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3,960 Posts
Discussion Starter #1
when i did my engine swap 2yrs ago i put in boshc +4's cause i thought they would work alot better. well i thought i noticed a difference but wasn't sure since i haven't driven the car in so long. for a while i've notice a very very slight rough idle but i thought it was all in my head...apparently it was not. i did the acis mod and p&p my intake plenum and manifold i also removed all the grime that was in the top end of my motor. the rough idle was going away but i still couldn't figure out why it was acting this way. so i figured i since i'm changing the oil i might as well change the plugs also. i removed the +4's and i noticed that they looked like they were working too hard to make a spark so i compared them to normal platinums and i noticed the electrode was further away on the +4's then they were on the normal platinum plug. so i guessed this must have been my problem. when i changed the plugs i emidiately noticed a big difference. the car responded very well and had better pick up at passing speeds.

so to make a long story short...don't buy +4's or +2's just normal style plugs work the best all those gimic plugs hurt your performance.
 

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Registered
1990 Celica GTS
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2,714 Posts
Not all engine like the +4s. They got small center electrol which will get too hot in some engine. Usually high CR and FI.
 

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pseudo-systematic
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176 Posts
i have found the only plugs that work well in toyotas are Denso and NGK. any other plugs seem to affect performance in a negative way.
 
2005 Tacoma X-Runner
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9,188 Posts
Another good story about those garbage bosch plugs:bleh:. I've seen this alot of times at the dealer and when I worked at goodyear. Stick with ngk or denso :thumbup: Unless you have a german car which is what they were designed for.
 

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Did somebody say "Nachos"
1992 Toyota Camry
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550 Posts
I heard from a mechanic friend, that he has changed +4's out and found that 1/2 to 3/4 of the electrodes had dissappeared off of at least one or two plugs in every car he's ever seen with them.

I'm sticking with the traditional-style single electrode plugs. Can't hurt to go to iridium's though.

my 2 cents :)
 

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Mad Scientist
94 scepter coupe
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3,960 Posts
Discussion Starter #7
trdcamry2003 said:
Another good story about those garbage bosch plugs:bleh:. I've seen this alot of times at the dealer and when I worked at goodyear. Stick with ngk or denso :thumbup: Unless you have a german car which is what they were designed for.
the problem was not the brand it was the style. i'm using bosch platinums now and they work great. it was the multi tipped ones that suck. it has nothing to do with what nationality car they are for. that my friend is all in your head
 

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Registered
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262 Posts
In my truck manual it says ONLY to use the double tipped plug. Is this good or bad since you are all saying that anything more than one tip is bad??
 

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Mad Scientist
94 scepter coupe
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3,960 Posts
Discussion Starter #9
i think it means double platinum plugs cause that's what my car requires. we're talking about the +4 and +2 type plugs that suck
 

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GT-i Crew
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632 Posts
I have been running Denso Iridium plugs for almost 60.000 Kms and I must say, I'm impressed, the car still pulls strong, idles smothely, throttle response is way better that with regular Denso Platinums and absolutely NO engine ping (even if I wanted to make the engine ping).

Highly recomended
 

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5M-GE
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2,901 Posts
Dad's 3800 GM V6 powered Bonneville has had really icky issues running +4's as well. AC Delco Rapidfire (top dawg for GM plugs) are wayyyyyy better. It's not necessarily high compression that does it, either. The Bonneville has an 8.5:1 compression ratio :p:
 
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