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Old 03-30-2013, 08:21 AM   #1
NJsubaruAllDay
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Default Misfiring please help!*

hey guys so i have a 2006 sti with a tbe with a stage 2 cobb tune, ive been having a miss fire on cylinder number 3 on and off but just recently it was misfiring bad where i had to pull over an get it towed to my house. So i already had the spark plugs replaced about 3 weeks ago so i thought that they would have been the culprit, but when i pulled it out it looked brand new. So i deiced to swap out the coil packs with cylinder i an 2. did that same an still had a missfire on cylinder number 3. so i went head a got a new injector an replaced the fuel filter in the tank(since car has 87k). started the car up an it ran great! then the next day the car started to sputter an smelled like gas in the exhaust. pulled the plug an it smelled like straight gas. anyone got any ideas? i would do a compression test but my plugs aren't getting fouled up

Please help! thanks guys
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Old 03-30-2013, 09:47 AM   #2
ALOKIN
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2013 WRX STI Limited
E85 Tune w/ Dom1.5XTR

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Wow, did you post this in EVERY forum?


IBTL
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Old 03-30-2013, 10:06 PM   #3
T_woot
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My car is misfiring too a bit at low rpms plugs and coils are fine. Compression test and leak down test checked out. Valve tolerance is good. I replaced the fuel pump with the walbro recently didn't do the filter though. Out of stock at the dealer... was thinking injectors next. Car has 61k on it.... not sure whats up.
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Old 03-30-2013, 10:06 PM   #4
T_woot
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Mine is 2006 wrx stage 2 btw
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Old 03-31-2013, 07:33 PM   #5
NJsubaruAllDay
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yeah i went to the dealer for the filter an they gave me the one for inside the engine bay, and when i told them i needed the tank one and they told me they didnt carry them in stock an when they change them they replace the entire assembly. So i had to get mine on ebay.

i opened mine up an thats what it looked like. And it should look white

Quote:
Originally Posted by T_woot View Post
My car is misfiring too a bit at low rpms plugs and coils are fine. Compression test and leak down test checked out. Valve tolerance is good. I replaced the fuel pump with the walbro recently didn't do the filter though. Out of stock at the dealer... was thinking injectors next. Car has 61k on it.... not sure whats up.
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Old 03-31-2013, 08:34 PM   #6
jaxscuby
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you swapped injectors from 1 and 2?

when you're having misfires on #3?

swap coil packs from 1 to 3.

i would do a compression test anyways.
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Old 04-01-2013, 07:56 AM   #7
NJsubaruAllDay
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i already swapped coils an bought a new injector, the cars at my friends shop so hopefully ill find out soon what the problem is.
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Old 04-10-2013, 09:26 PM   #8
NJsubaruAllDay
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UPDATE***** after i had enough i took it to the shop. Compression was below 129psi on all cylinders an #3's compression was at 115psi! timing was checked an was fine all injectors were working fine an leak down test came back okay. So motor was being pulled out thinking cracked pistons. During the tear down all cylinder walls were coated with fuel but all pistons an both heads were fine. Anyone got any idea's? im lost at what else could be wrong.
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Old 04-10-2013, 09:34 PM   #9
niemkij
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Well, you are getting fuel so maybe you have an electrical problem.
Check continuity of wiring? Broken wire near plug that goes into the coil?
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Old 04-15-2013, 12:22 AM   #10
NJsubaruAllDay
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nope all wire look okay
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Old 04-15-2013, 12:31 AM   #11
myblusti
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Quote:
Originally Posted by NJsubaruAllDay
nope all wire look okay
This may seem stupid but are you checking the ceramic portion of the plug. I had a similar situation with mine. I had a misfire on cylinder 3 so I swapped to a colder plug and it did nothing. Turns out the ceramic portion on the new plug was cracked barely and you couldn't tell at all at first. But after some time and heat, it became more pronounced. My advice is this.

1. Coat your coil packs with liquid electrical tape to prevent arcing
2. Add an extra ground to the packs. Can't hurt.
3 change plugs and gap them to between 0.030-0.032

That should solve your problems. Be sure to check the ceramic portion of the plug...
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Old 04-24-2013, 01:13 PM   #12
NJsubaruAllDay
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UPDATE* the ecu had a fray wire an was causing the missfire!
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Old 04-24-2013, 02:56 PM   #13
danger1138
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Damm all that for a wire.. What about the low compression issue on cyl 3?
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Old 04-24-2013, 09:36 PM   #14
NJsubaruAllDay
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Quote:
Originally Posted by danger1138 View Post
Damm all that for a wire.. What about the low compression issue on cyl 3?
well i had a rebuild done an b/c of the fray wire it was causing fuel to be just dumped into the motor an caused the rings to not properly seal against the cylinder wall thus causing all the cylinders to have low compression. so it was like a 5,000 dollar wire lol but the cel came on for cylinder number 3 cuz it had the lowest compression out of all of them. An when they were going threw the motor i also had a cracked inlet pipe :/ but i gotta new perrin one
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Old 04-25-2013, 08:06 AM   #15
danger1138
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Good to know .
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Old 04-25-2013, 09:43 AM   #16
AWDrifter21
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what made you and/or the tech check the ECU wiring in the first place?
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Old 05-01-2013, 02:16 AM   #17
NJsubaruAllDay
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cuz we thought it was cracked pistons that was causing the low compression in all the cylinders. An i haven't really heard of a ecu going bad on basic cobb tune.
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