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Old 05-03-2016, 06:00 PM   #1
subitrue
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Default Cold weather issues

I have a stock 2004 wrx with 120k miles on it , under 50 degrees the engine idles erratic but drives flawless, I get a cel that says engine misfire on all cylinders , even when the engine is warm , when the temp outside raises to above 50 car runs and idles perfect and cel goes away, I have read about the intake manifold gasket shrinking in the cold but I would assume that when the engine warms up even tho it is cold out, that would seal better, I live in Iowa and recently the temp has been fluctuating and the cel is gone, I spent all winter trying to solve this with no avail until the temp warmed up and now no issues!!?????? Any info would be appreciated.
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Last edited by subitrue; 05-08-2016 at 03:56 PM.
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Old 05-03-2016, 06:52 PM   #2
mishapopa
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What's the trouble code?

Honestly sounds like a sensor issue. Try cleaning your MAF sensor?
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Old 05-03-2016, 07:11 PM   #3
subitrue
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Default Cold weather issues

I have cleaned it about 2 times in the last 30 days But yes I have been leaning towards replacing it but I was thrown off when it went away as soon as it got warm the code was p0301 from autozone stating it was just cylinder 1 misfire but the shop said it was all 4 cylinder misfire
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Old 05-04-2016, 05:55 PM   #4
subitrue
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.anything?
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Old 05-05-2016, 09:09 AM   #5
vapore0n
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Try changing spark plugs and coils.
My car was giving me the same problem on cold days, missfire cyl 2, but would run great a min or two after start. Changed the coil and all got fixed.
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Old 05-05-2016, 09:37 AM   #6
mishapopa
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Quote:
Originally Posted by subitrue View Post
.anything?
State exactly what you've done so far otherwise to me it sounds like sensor or ignition issues. You're at 120k miles, there is a lot of simple maintenance you may have neglected to do.

Cold air is dense so your car will operate differently, it's critical that your sensors are clean and sensing the proper combustion mixture (O2 sensors) and your intake sensors are sensing the proper amount of airflow otherwise your car will just run like crap.

A few things that come to mind are MAF, spark plugs and boots, and O2 sensor. But the way you've stated the issue is really vague and honestly I'm not too familiar with turbo EJ platforms.
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Old 05-06-2016, 12:31 AM   #7
subitrue
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Default Cold weather issues

I have new ngk iridium plugs , new COPs, cleaned maf, replaced the fuel filter, replaced the pcv valve cleaned the throttle body and ran seafoam through vacuum, and fuel tank, cleaned the IACV checked for vacuum leaks but it is a steady 18-19 vacuum,

Last edited by subitrue; 05-08-2016 at 03:55 PM.
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Old 05-08-2016, 03:57 PM   #8
subitrue
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Anybody????
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Old 05-12-2016, 02:21 AM   #9
subitrue
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To the top help!
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Old 05-22-2016, 12:03 AM   #10
subitrue
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Well I replace all the hoses, intake manifold gaskets, throttle body gasket and the bpv gasket and still have pulled 2 P0301 cylinder 1 misfire codes
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Old 05-22-2016, 01:09 AM   #11
Jkmaynard
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I would say move onto a compression leak down test and see what you get
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Old 05-22-2016, 10:58 AM   #12
subitrue
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Compression or leak down test? Is there one that's better for the Subaru or just do both ?
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Old 05-22-2016, 04:43 PM   #13
point78
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Leakdown
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Old Yesterday, 11:22 AM   #14
afkramer26
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I have similar, however less consistent problem with an 07, (I just posted on another thread but this one seems quite a bit more similar). I live in a very dry climate and I believe I have also noticed weird performance fluctuation with different moisture levels combined with various temperatures, this made me think of a electrical/electronics issue. Interested to hear your solution.
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Old Yesterday, 01:17 PM   #15
subitrue
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I have just replace the intake manifold gaskets less than a week ago and haven't had an idle issue or CEL since. I read some forums that they had a similar issue and that fixed it so as of now my Rex runs like a champ(but the weather is now warm) I will get back to you if the problem returns
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Old Yesterday, 01:19 PM   #16
subitrue
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The mis Fire I stated above after the intake gaskets was the Evap purge valve line to the manifold I missed hooking up but the cel went away since I seen that
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Old Yesterday, 06:33 PM   #17
umrjmac
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Have you tried swapping the plug/wire/coil pack from the misfiring cylinder to a different one to see if the misfire follows it? You can do it all at once to rule everything out. Then (or instead) you can swap back one part at a time to find the culprit (assuming the misfire followed, of course).

You mentioned that you installed new plugs, so its most likely not that, but it doesn't hurt to be thorough.

Then I would try the compression/leakdown test
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Old Yesterday, 09:59 PM   #18
subitrue
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I have swapped the plugs, coils and injectors around , but I have to say after I replaced intake manifold gaskets it has never had a smoother idle. So I suppose time will tell if it comes back,
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