So heres the deal, I have 2006 ss/sc with stage 2, K&N cold air 2.85 pully and GMPP exhaust and manifold. Since the installation of the exhaust and manifold, when i am at full throttle, at 5800-5900 rpm my car starts to back fire and I loose power intermintantly. It does this to the 7000rpm redline.
Anyone have any ideas? Power from take off to 5800rpm is fantastic, its just when i hit high revs.

-shawn

 

well first thing, u shouldnt be running a 2.85 pully on a stage 2 tune, your at sea level........ u could run it if u were living in alberta or sask or somethin, but not van...... i thinking u have leaned out ur car to much, and its running lean.

 

sounds more like spark blowout... what plugs you got in there and what gap

 

I dont think its the pully, it wasnt doing it with the stock exhaust. I have a bud with the same pully and he hasnt had this problem.

 

Listen to the man, the answer lies in his question

 

My plugs are NGK BKR7E's, gap im not to sure on.

 

hmm if they are the copper ones... check the gap.(iridiums come pregapped and you can't change em).. should be @.035 if bigger, that could be your problem. also make sure they are all gapped the same.

 

I think i gapped them at 4, i have another set, i will try 35, thanks.

 

if theay are at .040 then that is more than likely you're problem

 

I gapped my BKR7E's at .32 last time I changed them, and I haven't had any issues like that. I've run those plugs for a long time and they work great.

 

.32 will work also... My friend (blackss05) was having that issue, checked the plugs and they were gapped at stock... regapped and the car is fine now

 

Yeah, I want to pull mine soon and check, been running on the bottle for about 3 months now, just curious as to how the plugs are holding up.

http://www.magnecor.com/magnecor1/main.htm

^^ really good site for technical info on plugs and wires and such.

 

**** man, on the spray you should be checking your plugs more often then that. With the old monte I used to check em after every hit... but I was also running a 400shot on the car lol

 

Well, yeah, thats a small bit more than I run. I just use a 50 shot, and I use maybe 4-5 lbs a week at most, only a couple of sprays. Lately, I had a solenoid go bad and the weather has been shitty so I haven't used it at all in the last 2 weeks.

 

THanks for the help, I gapped new plugs at .34, and it did the trick!
yey!