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Old 05-31-2019, 01:04 PM   #401
dnace03
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Location: Chambersburg, Pa
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2005 WRX
WHITE

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Hey guys,

I have a 2.0L 05 WRX, I have a check engine light that is flashing. The 2 codes that I have are p0302, cylinder #2 misfire and p1491, manufacturer specific, relating the the pcv valve.

Has anyone seen a pcv valve cause a misfire?

I am getting fuel to #2 cylinder, can smell unburnt fuel on spark plug, brand new plug, good coil pack, good injector, timing is good. Front 02 sensor is good.
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Old 06-23-2019, 05:52 PM   #402
JoesSlowWRX
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Default 2009 WRX Cylinder 3 Misfire

I just bought a 2009 WRX with 142,000 miles drives fine, and is in good condition. After purchasing the car I had a solid CEL come on, it was a misfire on cylinder 4, I thought most likely the lightweight flywheel.

I pulled the spark plugs to find out that it had the N/A spark plugs (NGK LFR6A-11);I put the stock (NGK SILFR6A) plugs in. Now I was sure this was the reason for the miss, and not the lightweight flywheel. Before changing to the correct plugs I checked their gaps, they were all .030. Now after changing the plugs cylinder 3 is constantly misfiring at idle, (At around 2k RPM the misfires stop.) I can hear it misfire and see my COBB tuner detect roughness on cylinder 3, the putter is in perfect sync with the roughness counter.

This is everything I've tried to fix it so far, I've switched coil packs and the issue did not follow, Pulled the spark plug examined it (It looked fine there were no cracks, had almost no carbon; EDIT: because it was misfiring) and I did a compression test (That was fine as well).

Why would changing from the wrong spark plugs to the right spark plugs make it misfire, and only in one cylinder? I'm personally thinking it is a fuel injector, because at 2k RPM the misfire stops. But why would the issue arise after changing spark plugs?

And one last question should I use a carbon cleaner in my gas tank or jump straight to moving the injector and seeing if the issue follows?

(I can't make threads)

Last edited by JoesSlowWRX; 06-23-2019 at 07:04 PM.
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Old 06-23-2019, 06:09 PM   #403
no694terry
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EJ22e 415whp/398wtq

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Quote:
Originally Posted by JoesSlowWRX View Post
I just bought a 2009 WRX with 142,000 miles drives fine, and is in good condition. After purchasing the car I had a solid CEL come on, it was a misfire on cylinder 4, I thought most likely the lightweight flywheel.

I pulled the spark plugs to find out that it had the N/A spark plugs (NGK LFR6A-11);I put the stock (NGK SILFR6A) plugs in. Now I was sure this was the reason for the miss, and not the lightweight flywheel. Before changing to the correct plugs I checked their gaps, they were all .030. Now after changing the plugs cylinder 3 is constantly misfiring at idle, (At around 2k RPM the misfires stop.) I can hear it misfire and see my COBB tuner detect roughness on cylinder 3, the putter is in perfect sync with the roughness counter.

This is everything I've tried to fix it so far, I've switched coil packs and the issue did not follow, Pulled the spark plug examined it (It looked fine, had almost no carbon) and I did a compression test (That was fine as well).

Why would changing from the wrong spark plugs to the right spark plugs make it misfire, and only in one cylinder? I'm personally thinking it is a fuel injector, because at 2k RPM the misfire stops. But why would the issue arise after changing spark plugs?

And one last question should I use a carbon cleaner in my gas tank or jump straight to moving the injector and seeing if the issue follows?

(I can't make threads)
The wrong plugs werent really the wrong plugs, the were the wrong gap, and that wouldn't cause a miss until you were up in the boost. Make sure you got the coil pack plugged in good. Or swap it with #1 and see if the misfire moves. If not I'd start compression checking
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Old 06-23-2019, 07:05 PM   #404
JoesSlowWRX
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Quote:
Originally Posted by no694terry View Post
The wrong plugs werent really the wrong plugs, the were the wrong gap, and that wouldn't cause a miss until you were up in the boost. Make sure you got the coil pack plugged in good. Or swap it with #1 and see if the misfire moves. If not I'd start compression checking
I have changed the coil pack as you stated, and did a compression check. The compression was fine and the changing coil packs didn't stop the miss.
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Old 06-23-2019, 07:31 PM   #405
no694terry
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Quote:
Originally Posted by JoesSlowWRX View Post
I have changed the coil pack as you stated, and did a compression check. The compression was fine and the changing coil packs didn't stop the miss.
I've had misfire issues from the injector plug not making good contact with the injector pins
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Old 06-29-2019, 11:18 AM   #406
JoesSlowWRX
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Default

Just wanted to let you know, it was a faulty spark plug, that or I cracked it during installation. the plug looked fine when I pulled it out; It smelled of gas. But now that a new plug is in, it is running just fine.

Thanks for your help man.
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Old 07-03-2019, 10:03 PM   #407
rkdc5z06
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great info. subscribed!
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Old 07-24-2019, 09:22 AM   #408
c2itutis
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Hey guys,

I have a Misfire in Cylinder 1, with codes P0301, PFFFF, and PFFFE. I have a steady CEL as of right now. CEL occurs when i go into boost. predominantly at 2nd gear going into 3rd, I feel the engine putter and misfire as well when going into boost even on the 4th and 5th. I changed the spark plugs at 110,000miles and this hasnt occurred till now at 145,xxx miles. So, I brought it to the shop to have the sparkplug changed and also had an inspection on it. here is the link: http://atxt.us/7tajvj . Now I dont know if their BSing me or something but they are saying to fix the problem they need a complete engine overhaul with cylinder and gasket sent to be fixed. Their quoting me somewhere around $3,000-$7,000. I dont know what to do. Any comments or your 2 cents would be much appreciated. thanks

Last edited by c2itutis; 07-24-2019 at 09:35 AM.
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Old 08-02-2019, 07:49 PM   #409
fawndog
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Solved !

History:
Rebuilt motor assembled and run stock for 2-3k, everything working fine.
Upgrades after verified good running motor;
ID rails and ID1000s
Aeromotive FPR and lines
STI TMIC
Turbo
Turbo back exhaust
Etuned.

Ever since the new parts were installed I have gotten sputtering and P0304 and P0302 codes when revving past 3k. Like everyone suggested I did the following;
swap coils
swap spark plugs
regap spark plugs smaller
regap spark plugs bigger
ground straps
check evap hoses
check intake leaks
MAF
CPS
swap injectors

I test drove after every single iteration of the above culprits was changed out/fixed. Nothing fixed the P0304 code and sputtering.

I finally got fed up and loaded the stock tune, guess what popped up? A Left TGV code.
I haven't touched these since the upgrades, why is this showing now after weeks of troubleshooting? Turns out the Left TGV was unplugged and the tuners tune didn't throw a code for it.

All my misfires and stumbling were from a closed TGV, plugged it in and no more problems.
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Old 08-07-2019, 02:30 PM   #410
SecondOneThird
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Have you done the timing belt, head gaskets and coil pack(s) at all?
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Old 09-06-2019, 08:18 PM   #411
saab14
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Question Does this list apply to 2.5L turbo engines too?

Does this list apply to 2.5L turbo engines too?

I have a 2009 STI with 214.000 km / 130.000 miles. I recently started to get occasional cylinder 1 & 3 misfire CEL, every 50-200 km or so. Always those cylinders, always at the same time. As best as I can tell, the engine runs just fine. I don't notice anything different when the CEL triggers.

I have replaced the spark plugs and the ignition coils.

Before I work through the rest of the list, I'd like to ask you: which of these possible solutions would be more likely to apply in my situation, given the above?

First time post, sorry if I am missing any of the forum etiquette...

Your thoughts greatly appreciated!
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Old 09-06-2019, 11:22 PM   #412
Wrayes9899
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Default Another possibility

Always double check harness connector, had a broke clip, that keeps the harness connected on my 99 forester sent it crazy on misfires and only did it when it was on a bad road where the car was bouncing from rebound.
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Old 09-08-2019, 06:30 PM   #413
saab14
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Quote:
Originally Posted by Wrayes9899 View Post
Always double check harness connector, had a broke clip, that keeps the harness connected on my 99 forester sent it crazy on misfires and only did it when it was on a bad road where the car was bouncing from rebound.
Thank you. Iíll have a go at that too.
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