I'm gonna recommend against Denso Iridiums or basically any iridium tip as I've fouled 2 sets of plugs already. One was Denso, one was NGK. I'm on my second set of (cheap) NGK's and about to go to my third due to damage from an exploding piston. They get buildup FAST.

BTW, don't forget to check your plugs from time to time for signs of detonation/fouling.

 

no idea.. like i said it could be running too rich.. dont u have any guages????

 

so andrew.. what plugs would u reccomend?? Im have NGK and they seem to work well for me.. but then again, ive only been turbo for around 600 miles

 

Extremely rich and extremely lean. The best of both worlds.

They work fine for a while sure. So did my Densos. They fouled during idle tuning. Second set fouled and caused lumpy idle ending in stalls. Third set is more or less a wash.

 

well i change the plugs did nothing for my prob. so i had the code read and it came up with aux emissions witch then came up with low imput to the egr valve. so i tested the egr and it worked fine, then looked every were for a vacume leek with no availe and after about 8-9 hours of trouble shooting ileaned againt the intake and the car idle up the friken mass was up against the positive batery cable cousin some kind of interferance . so long story short its alway somthin stupid

 

hmm never heard of that problem before..glad u got it fixed tho!

 

yea me too i was ready to give up and bring it too the dealer
thank you for all the comment on this post they all really helped

 

as far as plugs go for turbos...the best thing is irdiums...u can go with denso or NGK. in my old turbo I used NGK...great plugs but you have to worry about how hot or how cold you get the plugs? if your plugs are fouling to quickly, most definlety they are too cold..try going up a heat range or 2

copper plugs work great but if you are boosting like crazy...u will have to change them like every month but thats boosting like 15-18psi...if u are only boosting 6-7psi then i don't think you will foul that quickly

the only think i am not considerring is the increased compression they may make things different between the lancer and my old volvo