[AtlSupra]

I have some odd problems recently after spark plugs changed. Before my spark plugs were changed and BPUed, my idle was perfect at 700-800 rpm Now the idle speed drop to 500 rpm, and when I switched to park mode or stopped at red (without ac on), the car act if it's gonna chock or something (rpm meter jumps from 480-510 consistantly), and died 2-3 times. Any suggestion to get ride of this problem? Again I am using Rapidfire spark plugs...

 

[greensoup]

If you gapped your plugs down that could cause idle problems. I can't really speak concretely on idle because I run stock plugs and I have an OBDII car which have a strange idle already.

 

[SupraSC]

My car is doing the same thing

I changed the sparkplugs and mine is doing the exact same thing.
I think that my problem is that they are to ''cold''. I am running stock boost now and my plugs were for BPU'd. If you find something out let me know.

thanks,

 

[eddie c.]

Iridium Plugs might help!

I just changed the plugs from stock to a set of hks iridium plugs, and I noticed that the engine runs smoother without this rough idle like it had (the temperary choking symdrome) before... It stays right around 700 or 800 rpm and would not fluctuate much. Although pricy, the iridium plugs should last longer with this 'iridium tip' Hope it helps.....


regards,


----------------
eddie c.
98tt blk/blk 6sp (finally bpu-lized )
type-s fmic, dp w/cat, hks evc silver, hks ssbv, du-lock floor brace, trd susp, trd front strut bar, trd bushing kits, and stuff..........

 

[JeremyBlackwell]

running a BPU plug (colder w/ tighter gap) can result in a rough idle because the gap is so tight it doesn't completely combust the air/fuel mixture in the cylinder at idle. i have never used Rapidfire (except on my old 1996 SS camaro), but on most plugs you can go down to at LEAST .033 before experiencing a rough idle (though every car is different when it comes to plugs/gaps).
A lot of people use NGK plugs, but i swear by Champion Race Plug C63YC (NAPA #796). on my 1st supra i used the NGK & Champion plugs at BPU and was able to run about .003-.004 more without a miss using the champions. The ground strap on the champs is pulled back away from the electrode more than the ngk, thus exposing more spark to the a/f mix. worked great for me.
my .02 hope it helps!