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Old 01-05-2019, 04:45 PM   #1
Wendy2
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Default Misfire on all cylinder.

Subaru Wrx 2007 with 160k miles. Car misfire with slightly rough idle but doesnít affect driving ability. Iíve changed with new oem coil packs, new plugs, cleaned injectors , fuel pump. Hereís my live data when cell light turn on..

And here when the cell light automatically turn off on its own.
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Old 01-07-2019, 12:23 PM   #2
adesso
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So, I just recently went through this myself... Hopefully this helps...

My problem was that I had random misfires that would only occur at idle. As soon as any load was put on the engine, the misfire would disappear. Numerous data logs, trouble shooting, compression and leak down tests, etc, did not reveal the source problem. I gradually started replacing items, coil packs, spark plugs, sent my injectors out to be cleaned and flow tested, replaced fuel pump, new FPR, new fuel purge valve, new fuel filter, and then, eventually started replacing and upgrading ever fuel component from the tank forward. I eventually ended up doing new injectors, new fuel rails (converted from side feed to top feed), TGV deletes, new fuel lines, adjustable FPR, hard wired my fuel pump, new tune, etc... After all was said and done... the problem persisted. Again, only at idle with no load on the engine. I pulled and checked my Oil Control Valves as I'd read that they can go bad and cause misfire issues. They looked great, the valves didn't bind, the solenoids didn't have any issues and checked resistance with a multimeter, they showed to be within spec. I replaced them with brand new ones just to see if it made a difference, and low and behold, no more misfire. In fact, I can't remember my engine ever running this smooth. So, I know... long story, but I just wanted to cover everything that I did only to find out that the problem was not something that one would expect right off the rip.
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Old 01-07-2019, 06:05 PM   #3
Charlie-III
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First off, it is a "CEL" (check engine light, sometimes listed as a MIL), not a "cell". Yes, we know what you mean. It affects searches though......

Second, have you replaced any O2 sensors? Not really knowing your parts, usually, downstream (bank x, sensor 2 AKA BxS2) sensors sit about 0.5 volts, they do not normally bounce like an upstream O2 sensor.


Stock or modded? If modded, what? BTW, lights, stereo, etc. don't count, I am looking to tune, intake, exhaust, turbo, etc.
How long has this gone on?
Any recent engine work done just before this? If so, what?
How many tanks of gas since this started?
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Old 01-08-2019, 11:36 AM   #4
CaptainSlowbaru
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Quote:
Originally Posted by Charlie-III View Post
...they do not normally bounce like an upstream O2 sensor.
I saw that too, but my first thought was that the cat was bad. Fuel trims look good, so I wouldn't suspect any vacuum leaks. How do all of the engine grounds look?
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Old 01-08-2019, 08:15 PM   #5
Charlie-III
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Quote:
Originally Posted by CaptainSlowbaru View Post
I saw that too, but my first thought was that the cat was bad. Fuel trims look good, so I wouldn't suspect any vacuum leaks. How do all of the engine grounds look?
Welp, not ASE certified, but I still understand the basics, and have followed OBDII codes/issues over the decades.
Also subcontract for "stupid shiat" for some local stuff.

Since this is "general" issue......did it happen after new gas?
Could be low octane, water in the gas, etc.

Going to be a PITA, know the basics, think about the issue, go from there. Yes, we will help out.......

Tech forum section, you are fair game on slamming.

I will say, I will try to help out, no slamming involved.....

I go back to.......

Downstream O2 sensor seems more like an upstream (as mentioned before). Maybe I need to learn more on newer systems......

Misfires on all cylinders.....what is common?
Ignition changes
Intake changes
Fuel changes


Please help us help you.
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Old 01-09-2019, 09:31 AM   #6
Wendy2
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Default

Quote:
Originally Posted by adesso View Post
So, I just recently went through this myself... Hopefully this helps...

I pulled and checked my Oil Control Valves as I'd read that they can go bad and cause misfire issues. They looked great, the valves didn't bind, the solenoids didn't have any issues and checked resistance with a multimeter, they showed to be within spec. I replaced them with brand new ones just to see if it made a difference, and low and behold, no more misfire. In fact, I can't remember my engine ever running this smooth. So, I know... long story, but I just wanted to cover everything that I did only to find out that the problem was not something that one would expect right off the rip.

Thank you for your response. I will definitely check that out. I was reading on oil control valve. I do have rough idle time to time.
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Old 01-09-2019, 12:10 PM   #7
Wendy2
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Quote:
Originally Posted by Charlie-III View Post
First off, it is a "CEL" (check engine light, sometimes listed as a MIL), not a "cell". Yes, we know what you mean. It affects searches though......

Second, have you replaced any O2 sensors? Not really knowing your parts, usually, downstream (bank x, sensor 2 AKA BxS2) sensors sit about 0.5 volts, they do not normally bounce like an upstream O2 sensor.


Stock or modded? If modded, what? BTW, lights, stereo, etc. don't count, I am looking to tune, intake, exhaust, turbo, etc.
How long has this gone on?
Any recent engine work done just before this? If so, what?
How many tanks of gas since this started?


I have never replace the o2 sensor. The car is stock with SPT intake system. Been having issues for over a month now. The only major work Iíve worked on is putting a new clutch myself.
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Old 01-09-2019, 12:17 PM   #8
Wendy2
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Quote:
Originally Posted by CaptainSlowbaru View Post
I saw that too, but my first thought was that the cat was bad. Fuel trims look good, so I wouldn't suspect any vacuum leaks. How do all of the engine grounds look?


I check all the grounding. I make sure everything is cleaned and no rust or corrosion. The fuel trim is running rich. You can see it goes up to -11%. I cleaned my injectors. New fuel pump.
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Old 01-09-2019, 01:03 PM   #9
Charlie-III
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Quote:
Originally Posted by Wendy2 View Post
I have never replace the o2 sensor. The car is stock with SPT intake system. Been having issues for over a month now. The only major work Iíve worked on is putting a new clutch myself.
OK, cool, good info.
Sorry if I came off as a butthead before, not my intention.
I have to look at what downstream O2 sensors are used in the newer Subaru. As I stated, "usually" they float around 0.5 VDC, minor adjustment for what comes out of the CAT. Upstreams "hunt".......older is between 0-5 VDC, Lambda sit about 1 VDC and hunt.
I do not know what you have.......just commenting.
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Old 01-09-2019, 04:51 PM   #10
Wendy2
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Quote:
Originally Posted by Charlie-III View Post
OK, cool, good info.

Sorry if I came off as a butthead before, not my intention.

I have to look at what downstream O2 sensors are used in the newer Subaru. As I stated, "usually" they float around 0.5 VDC, minor adjustment for what comes out of the CAT. Upstreams "hunt".......older is between 0-5 VDC, Lambda sit about 1 VDC and hunt.

I do not know what you have.......just commenting.


No worries.
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Old 01-27-2019, 12:12 PM   #11
blizzardfish
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Unhappy Similar Issue

I'm having a similar misfire issue but it's coupled with code 0016.

Three weeks ago I'd changed my oil, then later in the week I backed my '07 WRX into my driveway and once I let my foot off the gas the car started to shake and the check engine light came on.

My code reader gave me codes P0016 and P0011. I'd first checked my starting system which was good, then checked the Camshaft Position Sensor and it was within tolerance. Finally I replaced my timing belt, water pump, thermostat and tensioner. Everything seemed to be okay but the old belt was cracked and definitely needed to be changed. After replacing everything and filling up the radiator I'd started the car and it idled a bit roughly but no codes right away so I took it around the block and it started idling quite poorly (low rpm's and rough). Codes this time were 0016,0303, 0301.

Thinking I must've gotten the timing wrong I pulled everything off again to reset the timing belt. Timing marks were lined up again and when everything was put back together and the car left to warm up the same codes showed up.

I'm not sure what to look into next.

Last edited by blizzardfish; 01-27-2019 at 04:52 PM.
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Old 01-28-2019, 10:15 PM   #12
blizzardfish
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Turns out I was sold the wrong timing belt.
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Old 02-13-2019, 12:22 PM   #13
Wendy2
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Fixed this issues by replacing front o2 sensor new maf and went back to stock intake
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Old 02-13-2019, 05:28 PM   #14
Charlie-III
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Quote:
Originally Posted by Wendy2 View Post
Fixed this issues by replacing front o2 sensor new maf and went back to stock intake
Did you do new parts in stages or all at once? Just curious.

BTW, thanks for closing out your issue, way too many threads just end....
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Old 02-13-2019, 10:30 PM   #15
hybrid gti 2
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Make sure the ground strap is solid to the block.
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Old 02-15-2019, 02:25 AM   #16
Wendy2
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Quote:
Originally Posted by Charlie-III View Post
Did you do new parts in stages or all at once? Just curious.



BTW, thanks for closing out your issue, way too many threads just end....


Personally, I think o2 sensor may have played a role. I was getting lean condition and sometimes the o2 did not fluctuate at its normal. I guessed and made an o2 replacement from autozone.
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