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01-19-2021, 11:14 PM | #426 |
Scooby Newbie
Member#: 256620
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2014 WRX 4dr!! Satin White Pearl |
So I replaced my pcv valve on Sunday and this morning, 2 days later I get a check engine light with code p0304. Do you think it's related to something with the pcv I just replaced or is it a big coincidence that it's something not related to that? So frustrating.
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01-20-2021, 10:37 AM | #427 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
nope, when was the last time you changed your plugs and coils?
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01-20-2021, 07:08 PM | #428 |
Scooby Newbie
Member#: 256620
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2014 WRX 4dr!! Satin White Pearl |
I changed all 4 plugs 50k miles ago. I just did cylinder 4 coil and I still have the code. I didn't do plug because I only have 50k on them and now I'm pissed since I had it all apart. You honestly think it can't be something with pcv.
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01-22-2021, 11:40 AM | #429 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
chances are no, if it were it would be a general code or all the cylinders would be misfiring not just #4
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01-24-2021, 03:10 PM | #430 |
Scooby Newbie
Member#: 256620
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2014 WRX 4dr!! Satin White Pearl |
Ok so I replaced all 4 spark plugs today and I did my air filter too as it also needed replacing. The spark plugs definitely needed replacing. Cylinder 4 spark plug was noticably worse then the other 3. So I go to check code and on torque pro it already was saying that my cylinder 4 misfire was fixed, it was highlighted in green with a check mark now saying historic code, which to me means it was now fixed. I cleared anyways and started car. It fired up great and idled great but 5 minutes later CEL started blinking again, but only cel this time, no cruise control and traction control lights flashing now. So I check code and it's the same P0304. So I say to my self I better check this PCV again. I take intercooler out and get the PCV out and guess what, the valve doesn't even rattle anymore. I tried cleaning it, it starts to rattle but then it won't rattle anymore. So I have to get a new PCV but have to wait to Subaru is open. What would cause this to happen to the PCV in 2 days?
Last edited by demid30; 02-04-2021 at 11:13 PM. |
02-04-2021, 11:09 PM | #431 |
Scooby Newbie
Member#: 256620
Join Date: Sep 2010
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2014 WRX 4dr!! Satin White Pearl |
I replaced the pcv and still have the p0304. So 4 new plugs and new coil on cylinder 4. This is frustrating, and ideas?
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03-24-2021, 01:50 AM | #432 |
Scooby Newbie
Member#: 490492
Join Date: Aug 2018
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on the way to check ..
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10-05-2021, 09:34 AM | #433 |
Scooby Newbie
Member#: 399293
Join Date: Aug 2014
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Delete
Delete
Last edited by bjakiel; 10-05-2021 at 09:36 AM. Reason: Delete |
10-05-2021, 09:35 AM | #434 |
Scooby Newbie
Member#: 399293
Join Date: Aug 2014
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Misfire cylinder 3 in boost, not recorded when maf unplugged
Hello,
I have a 2013 sti. I've been moving through the steps listed on this forum to diagnose my P0303 code. It only occurs in boost during WOT at around 3500 to 4000 rpm. The car shutters a bit and struggles, then the code is thrown. On the MAF step, I've disconnected the MAF and have attempted to reproduce the misfire. My cobb accessport did not log any cylinder 3 roughness this time with the MAF disconnected. However, the symptoms where still present, maybe a tiny bit better. Does unplugging the MAF disable the logging of P0303 and cylinder roughness? Any hints other than continuing down on the list provided? |
01-16-2022, 10:48 AM | #435 |
Scooby Newbie
Member#: 528380
Join Date: Jan 2022
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Have a misfire on cylinder 4 only at hot idle, been through everything. Finally pulled valve cover to check valve lash. Here is what I had:
Int ft of engine 12 13 10 9 Ex ft of engine 12 9 12 11 From what I see .008” for intake +/-2 and exhaust .010” +/-2 and more people recommend on the turbo ej25 for the wrx .012” for exhaust. I have checked compression cold, 130psi all cylinders, #4 0% leak down, new pistons, borescoped no cracks on ringlands, swapped coils, plugs, rebuilt and swapped injectors, still no avail. Checked for vacumm leaks, or intake gasket leak, none. Even pulled off the extra valve cover venting hoses and routed off the intake to just atomosphere to make sure not and excessive blow by, still nothing. 91 tune filled with 93 and octane booster. Twice. Timing belt perfect. Cleaned Maf, added extra grounds, new coil pack connector on #4. 38psi fuel pressure at idle. Crank gear ok. Cleaned OCV on bank 2. Cam sensors and crank are clean. New fuel filter and Walbro 225 pump. TD0516g blouch turbo, Catless downpipe, step one colder plugs, new coils, headgaskets, arp head studs, tgv deletes, new pistons and rings. Heads cleaned with new valve stem seals, valves just lightly lapped on the bench. Mishimoto turbo inlet, new pcv and hoses, spt intake. New timing belt and pulleys/tensioner. Stage 2 clutch with chromoly lightweight flywheel(14lbs though this could be issue, but it is only on 4). And cylinder 4 cooling mod. New O2 sensor. Extra grounds. 2 core radiator, mishimoto fans. Ebay unequal length headers and up pipe. Wrapped. Sti tm intercooler. Tune by Eric and torque Performance 2006 wrx Build has about 2,000 miles on it. Sometimes at idle hot it won’t count any roughness, and then sometimes it does. Counts as high as 30 on 4 and normally 4-12 when it isn’t as bad. Cylinder 2 will count sometimes up to 8 but rarely. Other side fine maybe 1-2 here and there but very rare. Will set a code for misfire on 4. Idles at 750 when it happens and if I bring it up to 1000 the miss goes away. Kinda at a loss on this one. I know my lash is off but I didn’t know if it was enough to cause my issue. Leaning towards electrical if I cannot find it here. But weird it can come and go and pull wiring harness all over and it makes no change. When it happens at idle you can barely notice unless it counts up to 24-30 and you hear the little pop from the exhaust and feel it, when it is below 10 barely know unless you are looking at the accessport. I have been over everything twice and over a million forms and I saved lash for last and this is where I am at. Any insight is greatly appreciated! Thanks! |
04-30-2022, 01:29 AM | #436 | |
Scooby Newbie
Member#: 529822
Join Date: Apr 2022
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Lightened flywheel issue
Quote:
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07-07-2022, 08:11 AM | #437 |
Scooby Newbie
Member#: 530113
Join Date: May 2022
Chapter/Region:
RMIC
Vehicle:2005 WRX, EJ205 Silver |
Is this list supposed to be in order of most to least likely? It also doesn't specify CEL status.
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07-25-2022, 09:23 PM | #438 |
Scooby Newbie
Member#: 530824
Join Date: Jul 2022
Chapter/Region:
NESIC
Vehicle:2011 Impreza WRX |
Another mysterious misfire post
Greetings! I've been through all the common misfire causes to no avail. 2011 WRX GV, no engine mods/tune, not even an aftermarket intake. 214k miles. Top end engine rebuild at 168k miles, professionally.
I'm experiencing a misfire on all cylinders, codes P301-4. Running like a dream, no CEL codes in years, then started sputtering abruptly at a stop light. All components of fuel delivery are good (fuel itself is clean, filter is clean, pump/lines/rails all good, replaced injectors and cleaned ports as part of troubleshooting with DW drop in replacements). Coil packs/connectors and plugs brand new OEM as part of troubleshooting. No sign of ignition wire nicks or issues. All grounds (that I'm aware of) in the car, battery, radio head unit (aftermarket) systematically checked. Cleaned MAF sensor, checked intake pathway for obstructions or boost leaks. Compression test near perfect (150-155PSI warm), oil is totally clean. Replaced timing belt and rollers as part of troubleshooting (Bank 2 intake cam gear off one tooth observed), no change. I unplugged the MAP, MAF, upstream O2, downstream O2, secondary air pump, AC compressor, systematically and restarted the car each time. No change. The weirdest thing is it won't connect to the scan tool when running to see a live map. Using Snap-On Verus Pro tool. It connects and gets data, key on-engine off, but as soon as you turn it over something pulls it down and it doesn't send enough power to the scan tool and it errors. Never had an issue with this scan tool with any other vehicle. Leads me to believe the issue is electrical, like a needle in a haystack...can anyone hit me with common sensors or electrical issues on the stock car that may be causing this? Another tidbit: It idles rough but won't stall at cold start, then gets worse as it warms up. I'm at my wits end...car is in alleged perfect health for it's mileage, just doesn't run smooth. Send help. |
09-16-2022, 12:04 PM | #439 |
Scooby Newbie
Member#: 220375
Join Date: Aug 2009
Chapter/Region:
TXIC
Location: Pasadena, TX
Vehicle:2011 Outback Sport Blue |
Heads up on faulty crank position sensor:
It can be so intermittent that it passes all tests (ohm's and even oscilloscope). I couldn't confirm that was the problem on mine for 4 years until it degraded from misfire to crank-no-start, and the stars finally aligned so that I could read it with an oscilloscope while it was crank-no-starting. It's a $20-$50 part, depending on which brand or where you buy. So, if all the other cheap/easy tests fail (compression, leak-down, fuel pressure, spark, timing, etc) then get a cheapo CPS off of rockauto, stick it in (it's fairly easy to access, at least on an EJ253). Drive the car around for a bit, and see if it clears up the misfire. |
09-16-2022, 12:05 PM | #440 |
Scooby Newbie
Member#: 220375
Join Date: Aug 2009
Chapter/Region:
TXIC
Location: Pasadena, TX
Vehicle:2011 Outback Sport Blue |
Heads up on faulty crank position sensor:
It can be so intermittent that it passes all tests (ohm's and even oscilloscope). I couldn't confirm that was the problem on mine for 4 years until it degraded from misfire to crank-no-start, and the stars finally aligned so that I could read it with an oscilloscope while it was crank-no-starting. It's a $20-$50 part, depending on which brand or where you buy. So, if all the other cheap/easy tests fail (compression, leak-down, fuel pressure, spark, timing, etc) then get a cheapo CPS off of rockauto, stick it in (it's fairly easy to access, at least on an EJ253). Drive the car around for a bit, and see if it clears up the misfire. |
02-29-2024, 10:22 AM | #441 |
Scooby Newbie
Member#: 173313
Join Date: Mar 2008
Chapter/Region:
RMIC
Location: Missoula, Montana
|
I don't see it talked about here but my misfire was caused by the tune. Switched from side feed to top feed injectors on a 2005 FXT with TGV deleted, cylinders 2 and 4 were counting Roughness/Misfire when I was around 2600 rpm very low load like 30mph trying to go 35 but traffic in my way. Never threw a code but counted up to 10 and I could probably make it coint higher if I maintained that load and rpm.
I check spark plugs after 200 miles on the new type RA block and cyl 2 and 4 plugs were kind of oily and black. I thought valve seals but the heads were rebuilt 10k ago. Well it turns out the Per Injector compensation tables were adding 10 to 15% fuel on cyl 2 and 4 in that range by default on a 2005 Forester XT. These comp tables changed format for top feeds but was similar enough that I just took the 2007 FXT table and divided it by 100 to work with the 2005. It has more like 2% to 4% added fuel in these areas. Some people zero out those tables, but you can convert like I did and it works. |
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