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Old 04-01-2013, 06:49 PM   #1
ebonyRx
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Default Breaking up after 16 psi

Hey guys . I recently had a cylinder 2 missfire i put a new maf sensor "denso" in and put a new coil pack on #2 its off brand i believe i also put 1step colder plugs in aswell. I have ran all the fuel out and ran fuel system cleaner . What else could be causing this ? Any help is greatly appreciated
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Old 04-01-2013, 06:57 PM   #2
HinshawWRX
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Car? Mods? Why the hell do you have 1 step colder plugs? Define "breaking up after 16 psi" or in general what the problem is since you've not explained anything. The more INFORMATION you provide, the more we can help.
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Old 04-01-2013, 08:07 PM   #3
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Did you only put one step colder plugs in #2 or all of them?
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Old 04-01-2013, 10:34 PM   #4
ebonyRx
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I replaced all 4 with colder plugs .. Car has 110,000 miles . Mods are full exhaust cobb ots tune vf34 turbo . Gsp inlet and afta maf . Rc550 injectors . Turbo xs fmic . Just had fuel lines replaced at Subaru last month and replaced the pcv valve the other day . Once it hits over 16psi the car staring breaking up " popping and not running or pulling smooth " hope that is a good description . I sprayed brake cleaner around all the vac hoses and tb and ic boots while the car was idling and the rpm didnt change .
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Old 04-01-2013, 11:12 PM   #5
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boost leak or bad plugs or bad coil packs most likely
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Old 04-02-2013, 03:37 AM   #6
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^^^or plug gap
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Old 04-02-2013, 07:08 AM   #7
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Plugs are at 30 thousand . And the cylinder that was missing was the one that i replaced the coil pack on
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Old 04-02-2013, 10:02 AM   #8
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Quote:
Originally Posted by ebonyRx View Post
Plugs are at 30 thousand . And the cylinder that was missing was the one that i replaced the coil pack on
swap the two coil packs and see if the misfire follows it.
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Old 04-02-2013, 04:46 PM   #9
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I haven't got a code in a few days now . Today i was going uphill and at 16 psi it started to break up . Than i made a 3rd gear pull on level ground 20 psi and ran fine untill i floored it ..
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Old 04-02-2013, 04:55 PM   #10
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sounds like a boost leak, then...and id change the plugs out, too
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Old 04-02-2013, 05:56 PM   #11
ebonyRx
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I bad o2 sensor couldn't cause this could it ?
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Old 04-02-2013, 06:04 PM   #12
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quit flooring it.

gap to large..0.027
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Old 04-02-2013, 07:47 PM   #13
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Just put on stock tmic and bov and still breaking up
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Old 04-02-2013, 09:02 PM   #14
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Quote:
Originally Posted by ebonyRx View Post
Just put on stock tmic and bov and still breaking up
You have a BPV stock, and switching the TMIC has nothing at all to do with it.
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Old 04-02-2013, 09:14 PM   #15
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Quote:
Originally Posted by ebonyRx View Post
Just put on stock tmic and bov and still breaking up
d00000000000000000000d......yer gonna eventually solve whatever it is by accident and never know what the real issue is

or blow it up tryin and sell it because it never ran right anyway
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Old 04-02-2013, 09:17 PM   #16
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Why dont you listen to the people telling you the spark plug gap is too big and just gap them down?! It isnt going to cost you a dollar and is more than likely going to fix your problem!
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Old 04-02-2013, 09:22 PM   #17
ebonyRx
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Reason i didnt do so in the first place was because my buddy runs the same setup and same plugs and has no issues and the plugs i pulled outta my car were at 36 thousands ! I did change the fuel filter tonight . I will regap plugs tomorrow and post back results . Thanks guys
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Old 04-03-2013, 10:31 AM   #18
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I have to go .024 or lower in my honda do get away from ignition breakup, of course its got a turbo 3x the size as my wrx and over 30psi...... I guess my point is your not going to hurt anything by gapping them down further plus its free and quick.
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Old 04-03-2013, 11:37 AM   #19
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Does anybody have any advice or opinion on a jdm turbo? Is it junk?
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Old 04-03-2013, 12:29 PM   #20
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Quote:
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Does anybody have any advice or opinion on a jdm turbo? Is it junk?
Stop trolling. Read the FAQ.....
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Old 04-03-2013, 02:44 PM   #21
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I have to gap mine at .024. I also just fixed a customers car with the same problems and it was the gap (his was .030) that is why I said that in post #6. I would start there. I doubt you needed cooler but they won't hurt. There are still alot of options so let us know what happens,
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Old 04-03-2013, 04:21 PM   #22
ebonyRx
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Hey guys i gapped them to 27 as requested . Car doesn't break up as bad .. But still does . Also now i get a flashing cel and cylinder 1 3 4 misfire the plugs are ngk v power
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Old 04-03-2013, 06:55 PM   #23
ebonyRx
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I also plugged in the cobb on" a/f sensor 1 " at wot it shows 11.6 .. So im thinking its not a fuel pump .
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Old 04-03-2013, 07:13 PM   #24
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thats abit lean..

i personally run 10.9 to 11.1 with a tmic
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Old 04-03-2013, 09:46 PM   #25
rdieder
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Quote:
Originally Posted by ebonyRx View Post
I also plugged in the cobb on" a/f sensor 1 " at wot it shows 11.6 .. So im thinking its not a fuel pump .
That's probably not the actual afr, just the front o2 limitation. You'd need a wb to find out.
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