Thread: Spark plug suggestions?

i have a 97 gtp and i have the 3.4 pulley, 180 thermo, colder plugs(im guessing), resonator delete, and soon to have the u bend and high flow cat. i just blew out my trans and am currently rebuilding it. since i pulled the motor i started to disassemble everthing to paint it. everything was clean but there was alot of sludge build up. anyways, the car ran like **** when i had it out in the summer. when i removed the plugs they were very dark and my dad said it was running too rich. the plugs were bosch platinum i believe. is there any plugs that anybody recommends i should run?

Originally Posted by 99prixgt

Your best bet is probably 104's (regular copper). Our cars don't like platinum very much. The copper's will have to be replaced often but, $1 a plug im not complaining

I'll have to agree.

Originally Posted by bluegtp91

X2...you could probably HEAR it knock

the car ran weird. somedays it would run perfectly fine, but then if i let it sit for awhile and then drive it again and get on it, it would run so horrible i dont even know how to describe it. the rpms would knock back like 2k rpm every half a second at wot. not good

Originally Posted by 05SS45

al 104's! the car was prob running like crap because you have a 3.4 on with stock manifolds & stock down pipe.

and thats how i bought the car. i just got it in december. im new to grand prixs

104's .035 gap..either get a stoock pulley or after market headers or plog and rework rear mani, and d/p

Originally Posted by 05SS45

i would def get a plog & down pipe w/tune for that pulley asap!

yeah im gettin stuff slowly but surely.

Originally Posted by badbrad

104's .035 gap..either get a stoock pulley or after market headers or plog and rework rear mani, and d/p

I would not go smaller than a .045 . There is no need to go that low. On my 2.8 I/c'ed setup I had a 0.45 gap.

guy that tuned it sat. was adamant about the gap...hhhheeeeeeee said on cobras and lsx cars thats what he recommeds.....still i was very hesitant on that little a$$ gap. could it affect the tune going back to .050 ??? didn't mean to high jack this thread.

Originally Posted by TDCRacing

I would not go smaller than a .045 . There is no need to go that low. On my 2.8 I/c'ed setup I had a 0.45 gap.

so what do u suggest i gap the plugs to?

Originally Posted by projectGTP

so what do u suggest i gap the plugs to?

With a 3.4? I'd go around 0.050

Originally Posted by badbrad

guy that tuned it sat. was adamant about the gap...hhhheeeeeeee said on cobras and lsx cars thats what he recommeds.....still i was very hesitant on that little a$$ gap. could it affect the tune going back to .050 ??? didn't mean to high jack this thread.

Nope it won't affect the tune. But it will more than likley improve idle and throttle response.

will try it today....

Originally Posted by BiggRiggs

Also-
x2 on the plog/3" dp idea. Don't blow up your motor by running a pulley that's too small for your mod list.
-Riggs.

well what if my car is running perfectly fine wit the pulley? i heard that every grand prix is different and some have KR when others with the same mods dont. and i dont think the dp is all that restrictive. just the cat