Bosch Platinum +4

Were your other plugs in need of replacing? It may not have been these new plugs as much as new plugs in general smoothed out the idle. I don't know...the consensus I have always heard is that the NGK coppers are the way to go with the FSDE.
 
I've used them in a few vehicles and have always liked them so I put them in my 2002 at around 114k and it ran great. I picked up the car used so I have no idea how old the plugs were before the change. All I know is that the gap looked pretty bad so almost any plug would have likely made a difference. I've had the car for almost a year now and it is really growing on me (when my wife lets me drive it....:D ). Sweet little ride!
 
i use the bosch platinum fusion's not sure if theres a difference between other plugs that need to be gapped its been a long time since i used other plugs let me know if anyone has used the fusions and if u liked them...
 
MazdaSpeeder said:
Were your other plugs in need of replacing? It may not have been these new plugs as much as new plugs in general smoothed out the idle. I don't know...the consensus I have always heard is that the NGK coppers are the way to go with the FSDE.
Click to expand...


Pretty sure they were the original plugs so yes bout time they got the ol' heave hoe haha SO yes any new plug most likely would have made a difference as they were in pretty hard shape.
 
jeeeez .. few bosch haters here! haha well no problems yet .. no worries I've got a back up set of NGK's now if the bosch fail miserably
 
Stick with the OE plug, in this case NGK's. In my professional opinion, Bosch plugs suck and should only be used in vehicles that came with them from the factory . I have lost count of the number of vehicles I have had to "fix" because someone decided to "upgrade" to +4's and only wound up creating a problem. Use the correct original plug (or the alternate deeper NGK available for this particular application). While there are many options, there is only one plug Mazda designed that motor around.
 
:( oh god now you're just instilling fear!!!!

Had a rough idle at a set of lights tonight .. hope this is not the problem .. otherwise ill be replacing the +4's lol
 
before replacing I'd just like to understand the problem though haha. With more points for a spark and a longer plug shouldn't it be amazing??? :|
 
dont ever be suprised at the way our cars respond to things. the slightest thing can trow them off, at least for the zm engine.
 
lanny709 said:
before replacing I'd just like to understand the problem though haha. With more points for a spark and a longer plug shouldn't it be amazing??? :|
Click to expand...

There are a lot of differences you can't see, like heat range, the actual KV needed to jump the gap, etc....Sure, more electrodes should mean longer life, but at the same time, electricity only flows from ground to the voltage source through the past of least resistance(yes that sounds backwards, but electricity actually flows from ground...), so its only using one of the electrodes at a time. I love the old splitfire commericals and ads that showed four sparks jumping at the same time. I always wanted plugs that defy the laws of physics.

Again, NGK's are the OE plug and what Mazda used when they designed the powerplant, so thats what they should use. Just like always using Delco plugs in a GM and Autolites in a Ford, stick with the OE and you won't have issues
 
lanny709 said:
before replacing I'd just like to understand the problem though haha.
Click to expand...
If this is the case then what was the problem with just putting back new NGKs that were undoubtedly cheaper to begin with? Not trying to be an ass, just trying to follow the logic..........
 
But also, what about the numerous threads out there that specify the NGK's in the first place?

Just throwing that out there... I read many threads in which this has come up many times.
Basically it takes much higher voltage to arc those fancy plugs.
 
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