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Old 01-23-2015, 10:38 PM   #1
wizardslovak
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Default Missfire on High RPMS

HEllo people

2002 wrx and i am having CEL on cyl#3 missfire when on high RPMS..

When car is driven normally it drives without problems untill around 5500 rpms..when it get missfire ..
Ive changed spark plugs and new ignition coils , compression test was 138 on that cylinder..checked for boost leak, reseted code and bam it happened again ..

What else could do that problem?

injectors? fuel pump?

thank you in advance
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Old 01-24-2015, 12:09 AM   #2
Chuckls
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Check the plug itself. Cyl3 is right in that pocket of heat from the turbo and uppipe. The clip that plugs into it tends to break, causing it to jostle around at WOT.

https://www.youtube.com/watch?v=O4MJC8dfyE4
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Old 01-24-2015, 08:47 AM   #3
wizardslovak
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Thx ill check it out

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Old 01-25-2015, 09:00 AM   #4
wizardslovak
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Checked clip and looks good without any brakes..holds and looks new.. any other ideas?

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Old 01-26-2015, 06:20 PM   #5
cokal
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I'm going through a similar issue, RPMs got lower and lower with regards to hesitation. Check the misfire thread, could be a simple vac/boost leak, to much venting

A leaky injector would put too much fuel in the cylinder and cause a misfire

Also the fuel pressure regulator is part of this equation so test fuel pressure (connect guage, run engine, check pressure, then remove vac line going to FPR

make sure grounds and battery terms are clean too


I'm leaning towards coil packs now that my engine barely runs and spits out gobs of black smoke, delivery on wednesday.
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Old 02-19-2015, 08:28 PM   #6
wizardslovak
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its not boost leak nor vac leak

i am leaning more to valve problem on that cylinder
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Old 02-22-2015, 09:18 PM   #7
MAJRMSA
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I had a similar issue on my 02 WRX. I switched from iridium plugs to OEM platinum plugs and the misfire went away.

Did you purchase new OEM plugs?

I would also perform a compression test. Has the valve lash ever been adjusted?

Last edited by MAJRMSA; 02-22-2015 at 09:24 PM.
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Old 03-05-2015, 07:03 PM   #8
wizardslovak
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I will change plugs completely to oem plugs, and remove utec..
compression test was 138 in cyl3
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Old 03-06-2015, 06:41 PM   #9
rexblake
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Run regular plugs. It might be spark blowout, try adjusting to a smaller gap. Usually only an issue with E85, but check it anyway.
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Old 03-07-2015, 12:55 AM   #10
wizardslovak
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Awesome thx
ill get these NGK (4793) PFR6G Laser Platinum Spark Plug and gap it to .028 and see.

hopefully spring comes faster , will remove fmic and change all couplings , and start battling rust..

As for valve lash , mechanic didnt take engine apart so i am sure he didnt do that . I am actually thinking to get new gaskets and remove/check heads .
Car came with lots of mods so i gotta start writing down all mods.
thank you

Last edited by wizardslovak; 03-07-2015 at 10:18 AM.
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