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Old 04-22-2007, 01:34 AM   #1
Nuke209
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Default Misfiring after spark plug change

I drive an 06 wrx and just changed plugs to copper, I gapped them at .028 and torqued them down to 17lbs

when in boost, the car misfires and I get a cel but it'll disappear
If i keep it on the gas while misfiring, the cel will stay and give me p0301 & p0302
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Last edited by Nuke209; 04-23-2007 at 09:49 AM. Reason: had it at .28 when it's suppose to be .028
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Old 04-22-2007, 04:32 PM   #2
Nuke209
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are the sparks torque'd down too much or needs to be tighten more?
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Old 04-22-2007, 04:41 PM   #3
koochman
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Also, make sure the coil packs and wires are on tight.

0301 and 0302 are misfire on cylinder 1 and 2. Cylinders 1 and 2 are the front cylinders.

F--1--3--Pass side
R
O
N
T--2--4--Drive side
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Old 04-22-2007, 06:30 PM   #4
shadyrex
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Check the coilpacks. I switched plugs on my old car and snapped one of the tiny clips that hold the wire harness to it. It took me a bout an hour to figure that one out and had to run to the dealer in the gf's car to grab another coilpack.
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Old 04-22-2007, 08:22 PM   #5
Nuke209
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the coilpacks seem fine, they snap back in and out and nothing broke off

I just took out the plugs and regapped them and retorqued them down...still same problem
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Old 04-22-2007, 11:23 PM   #6
fullybuilt_07'STI
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try gapping them like ten thousands smaller
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Old 04-23-2007, 01:39 AM   #7
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Hot damn, I just noticed that. Its supposed to be 0.028 - 0.031, not .28.
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Old 04-23-2007, 02:17 AM   #8
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I doubt that the gap or torque have anything to do with the misfire. Check that the wires are on tight as previously noted. Did you apply anti sieze to the plug threads? if so you may have gotten some on the porcelain portion...it will conduct and cause a misfire.

Did you pull off the metal end inside the wire at the spark plug or damage the boot?

Lastly did you change to one of those multiple tipped or funky plugs? I have found that some of those can cause strange driveability problems.

If none of these work, try taking a fluke meter and checking the resistance of the wires, the key is that none measure open or ol on the display. As long as there is some continuity you are good.

Oh, and most important!! make sure you didnt crack any of the plugs on installation, any small crack will cause a misfire (usually all the time though)

Well, that pretty much covers most of the possibilities.

Good luck
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Old 04-23-2007, 09:20 AM   #9
Nuke209
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Quote:
Originally Posted by NWstiLTD View Post
I doubt that the gap or torque have anything to do with the misfire. Check that the wires are on tight as previously noted. Did you apply anti sieze to the plug threads? if so you may have gotten some on the porcelain portion...it will conduct and cause a misfire.

Did you pull off the metal end inside the wire at the spark plug or damage the boot?

Lastly did you change to one of those multiple tipped or funky plugs? I have found that some of those can cause strange driveability problems.

If none of these work, try taking a fluke meter and checking the resistance of the wires, the key is that none measure open or ol on the display. As long as there is some continuity you are good.

Oh, and most important!! make sure you didnt crack any of the plugs on installation, any small crack will cause a misfire (usually all the time though)

Well, that pretty much covers most of the possibilities.

Good luck
boot is fine, didn't pull no metal out of it

i did apply some antiseize but only on the thread

it is a v tip spark plug.

I will be putting back the stockers and see how they run.
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Old 04-23-2007, 09:43 AM   #10
STIred05
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Quote:
Originally Posted by koochman View Post
Hot damn, I just noticed that. Its supposed to be 0.028 - 0.031, not .28.
Ya that would make for one hell of a miss. If you do have the plugs gaped right then I would check out the coil packs... look for arcing.
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Old 04-23-2007, 09:48 AM   #11
Nuke209
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sorry, it's .028
LOL
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Old 04-23-2007, 10:55 AM   #12
WRXINTX
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what plugs are you trying to run???

are these the extra long (26.4mm) thread 2.5L plugs???
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Old 04-23-2007, 11:27 AM   #13
Nuke209
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i'm using coppers for the sti

they're the same length as my stockers
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Old 04-23-2007, 11:50 AM   #14
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I changed mine with Nuke and got the same problems.

1) I changed the stock plugs (06 wrx) to the ngk iridium made for the sti and got p0301. Stumbles hard as soon as I hit boost.

2) Retorqed the plugs and drove around. Cel came on but no code (read with AP) and no flashing cruise. Stumbles and feels like its misfiring under boost. Not as bad as before tho.

3) Replaced stock plugs and now the car runs fine.
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Old 04-23-2007, 12:06 PM   #15
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Post up part numbers!

Did you go colder or hotter?
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Old 04-23-2007, 12:26 PM   #16
Nuke209
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LFR6A-11

should be stock heatrange
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Old 04-27-2007, 09:25 PM   #17
lburrrna
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Quote:
Originally Posted by Nuke209 View Post
LFR6A-11

should be stock heatrange

are the stock plugs for the 06wrx platinum or iridium? do you have an NGK 1 step colder plugs part number??
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Old 04-28-2007, 10:47 AM   #18
Mr. Quick
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does anyone know what is the stock gapping is on the STi?
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Old 04-29-2007, 04:23 PM   #19
stisiu
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28 to 31
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Old 04-29-2007, 06:12 PM   #20
Nuke209
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those plugs were copper actually

i just put oem back and everything is fine...
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