Wrong spark plugs??
#1
Intermediate
Thread Starter
Wrong spark plugs??
Hi everyone, i was thinking about the spark plugs i hade changed out on my car a few years ago (for my 2009 rx350). I had ordered them from Rauto.
i just looked today in the owners manual, which says to use: FK20HR11 plugs.
on the rock site, there are 2 different Denso Iridium plugs. there was the Iridium TT (4704) plug and the Iridium long life (3426). Both plugs have a slight gap difference too. I installed the 4704 plugs. Is this okay? I think the car runs fine. I do find that at idle the engine isn't supper smooth, i can stiff feel the engine is on, and ever so slight valve tick on cold startup.
And info or advice welcome. Thanks
fab
i just looked today in the owners manual, which says to use: FK20HR11 plugs.
on the rock site, there are 2 different Denso Iridium plugs. there was the Iridium TT (4704) plug and the Iridium long life (3426). Both plugs have a slight gap difference too. I installed the 4704 plugs. Is this okay? I think the car runs fine. I do find that at idle the engine isn't supper smooth, i can stiff feel the engine is on, and ever so slight valve tick on cold startup.
And info or advice welcome. Thanks
fab
#2
Lexus Fanatic
90919-01247 aka FK20HR11 aka 3426 is the only plug specified for your engine, everything else is experimentation.
#3
Highly suggest you cahngethem over to the specified plugs for peace of mind. Next time consult your manual for the appropriate specs, good luck.
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LexBrett
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04-23-13 06:12 PM