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Old 11-16-2005, 07:44 PM   #1
stayfido
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Member#: 35726
Join Date: Apr 2003
Location: portland, or
Vehicle:
2002 psm sedan stg 4

Default Colder plug problems

I installed a set of ngk iridiums today (one step colder than stock and not the -11 model) and since then the car is running really rough. It wants to stall, but doesn't and even at speed the car still feels slightly rough. It also sounds different, kinda hard to explain the sound. I made sure the gap was correct (0.026-0.028") and also tightened down the intake real good. The only other thing I touched was the maf, but placed it down gently and nothing touched it. I am at a loss as to why the car is running like this. I am scheduled to get a dyno tune this weekend, so I'd like to get it figured out before then. Any ideas would be greatly appreciated.
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Old 11-16-2005, 08:23 PM   #2
lDeez lNutz
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2005 STi

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did you try putting the stock ones back on? do they have resistors or are they resistorless? your description says stage 4 so i'm assuming your car is somewhat modified for bigger power levels, typically you want to go 1 step colder if you have a significant amount of power adding mods.
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Old 11-16-2005, 08:36 PM   #3
stayfido
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You know I didn't try putting the stockers back on because it was such a PITA!! I am not sure what you are talking about when referring to resistors? And for what? I went to the one step cooler upon the advice of pdx tuning. I have a vf34, fmic, pinks, walbro and utec which badly needs a tune. Which is scheduled for saturday!
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Old 11-17-2005, 01:21 PM   #4
peterex
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2010 WRX

Default

Quote:
Originally Posted by stayfido
You know I didn't try putting the stockers back on because it was such a PITA!! I am not sure what you are talking about when referring to resistors? And for what? I went to the one step cooler upon the advice of pdx tuning. I have a vf34, fmic, pinks, walbro and utec which badly needs a tune. Which is scheduled for saturday!
Are your coilpacks okay? I've run the one-step colder NGK iridiums with no problems for 10,000 miles, and I have like 40-50 less hp than you.
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Old 11-17-2005, 04:39 PM   #5
speedblind
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Default

I went to a step colder over the summer, and it actually helped a lot during the hot months. Recently, though, the car started to misfire in all cylinders and the idle was sligtly lumpy. Went back to the stock plugs and all is well again.

Try that first. It's a PITA the first few times you do it, but you'll get pretty fast at swapping plugs, especially if the block is nice and cool.
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Old 11-19-2005, 12:37 PM   #6
ThrawlWRX
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2013 GR LTD & 03 GD
SWP / PSM

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side note... sorry... but does anyone know how much it costs to change spark plugs? If you don't know or can't do it yourself? (cuz the dealer doesn't touch them till 60)
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Old 11-21-2005, 06:07 AM   #7
vinceGC8
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Dark Grey Metallic

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its really easy. i did mine in about an hour. i just had a few tips from my friend. like...using a 3in adapter and duct taping it to the spark plug socket. its a pain in the ass when ur trying to remove the socket after you screw the plug in and it gets stuck in there.
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Old 11-22-2005, 04:48 AM   #8
JNUTZ
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2003 WRX
Rally Blue

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Quote:
Originally Posted by ThrawlWRX
side note... sorry... but does anyone know how much it costs to change spark plugs? If you don't know or can't do it yourself? (cuz the dealer doesn't touch them till 60)

I called the dealer today, because I'm gonna go one step colder too, and they said it'd be around 80 bucks.


bye the way how did your tune work out at PDX? They tuned my car and it went great.
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Old 11-22-2005, 03:22 PM   #9
4Runner
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