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Old 04-30-2008, 06:31 PM   #1
JSarv
Scooby Specialist
 
Member#: 163445
Join Date: Nov 2007
Chapter/Region: MWSOC
Location: Effingham IL (Central IL)
Vehicle:
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Default Test... Gone Wrong? Stupid Spark Plugs

Today I had the day off and figured I would try out a step colder plug, going from Iridium 6 heat range to Copper 7 Heat range (Both NGK)

I did logs this morning of the Iridium plug. And then Swapped out plugs (such a PITA I hate it). Logged again, fairly impressed with the results. Engine Temp was 1 degree colder at WOT 4k rpms. And to top it off it was 20 warmer out with the copper plugs and still yeilded those results. Timing loved every bit of it, or so I thought.........

Brought the car home, let it cool down, had to move it for the GF... Started on 3 cylinders and threw a misfire code.. I think? ECUExplorer would not pick it up, only a P1442 code. Anyway So I let it set for a bit and tried starting it again, same thing, running on 3 cylinders, no cel until I put any load at all on the car. EcuExplorer still did not pick anything up.

Decided that I would go get 6 Heat range Copper Plugs. Now the car seems a little strange, there is a slight hesitation at 2.5k under light throttle. Throttle response seems a bit off and there is WAY more after firing now. Not backfire, after fire.

Did some more logging, not once during any of the logs did I experience Det. but my #7 copper plugs beg to differ. They are white/grey/white, the porcelain on 2 of the plugs has black dots on it, nothing serious but definitely noticeable. No melting or heat glazing, they just look like there was slight detonation.

I will post pictures of the #7 plugs this evening, but has anyone tried this? Did I simply foul a plug? There is NO NO NO signs of a foul, it looks more lean than rich.

I'm so confused, why would a single step colder make such a HUGE difference.

For Reference, I am running a Catless Perrin up, Invidia V2 Catless DP, Perrin Single Tip 3" CBE, GM BCS, and XPT Stage 2 GM map. Running close to 17.4lbs of boost in 4th gear, with minimal total timing. NO CAI and NO VTA BOV.

If there is DET, it is at light throttle and around 2-3.5k R's. What could be causing this? Or am I hearing things hoping that this thing will blow a ring land through the bottom of the block?

I will have pictures of the plugs up soon. #3 cylinder (or closest to the baby snail) was honestly the best looking plug of the four. With the front plug in the Passenger side bank being the worst.

Any input would be fantastic.

Sorry for the crappy pictures Couldn't get the digi to stay focused, I think it has ADHD like I do That is Pass Side Bank, Front Plug (I can't ever remember the Order. It was the worst of the 4)




Last edited by JSarv; 04-30-2008 at 06:37 PM.
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