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Old 06-02-2005, 03:26 PM   #1
TyranosaurusWRX
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Default High RPM power loss (stutter?)

I have an 02 wrx, just recently completed an ej22t swap. I am trying to iron out all the bugs from the swap. One unusual issue that I am having is at about 6700-ish rpms, the car just seems to sputter out. It pulls really strong all the way up to that point and then just poofs out. It drops power too quick for it to just be the turbo dropping off.
It's a rare occasion that I make it to 7k rpms. I have datalogged using the UTEC and on paper everything looks good. AFRs are ~10.8:1, boost is full on and no knock (I have even played with lower timing values, but no change). Although if you keep the pedal sustained between 6700-7000 rpms, it occasionally will throw the knock signal, but it seems more like the sputter you get from misfire than it does knock.
My plugs were brand new just before my #4 piston bit it on the 2.0 ltr. I had them gapped at about .030, so last night I regapped at about .027-.028, still no change. I comp. tested the engine. My cheapo guage showed 135, 135, 136, and 140 so there doesn't seem to be a problem there.
Any other ideas? I may try just changing the spark plugs out alltogether.

Matt
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Old 06-02-2005, 03:37 PM   #2
mcowger
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What are your IDCs?
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Old 06-02-2005, 04:03 PM   #3
TyranosaurusWRX
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I am at work at the moment so I cannot give the exact number, but rest assured it was less than 70%.

My MAF voltages are approaching 4.7v. It may be entering the grey area, but my no means is it maxxed.

Last edited by TyranosaurusWRX; 06-02-2005 at 04:17 PM.
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Old 06-02-2005, 04:41 PM   #4
mcowger
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Well, if your IDCs are that low, then I'm out of ideas given that you've pulled out the timing.
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Old 06-02-2005, 05:14 PM   #5
TyranosaurusWRX
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Yeah, it's unusual. I am hoping it is nothing more than an ignition issue..I considered the fuel pump (Walbro)....but then I'm sure I would see a lean condition if that were the case.
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Old 06-03-2005, 02:31 PM   #6
TyranosaurusWRX
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Man this is complete crap. I changed out the plugs with different ones, still exact same scenario. I happen to have a spare crank pos. sensor lying around so I swapped that out.....now the sputtering is happening before 6k instead of after. I swear if this is another coil pack I am going to rip out the coil-on-plug system and find a new way to fire this thing.
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Old 06-03-2005, 03:40 PM   #7
TAZ_WRX
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clean the MAF and see what happens
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Old 06-03-2005, 04:37 PM   #8
TyranosaurusWRX
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I'll try that. The MAF is actually brand new, but, I do have a lightly oil K&N, maybe it dirtied it up.


I have confirmed that it is definitely misfire.
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Old 06-03-2005, 07:26 PM   #9
TyranosaurusWRX
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Welp, a dirty MAF is not the problem either.
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Old 06-07-2005, 04:58 PM   #10
TyranosaurusWRX
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We can add coil pack to the list as not the problem. I give up... This is a tough one. Valve adjustment maybe????
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Old 06-07-2005, 11:33 PM   #11
TyranosaurusWRX
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misfires are a b***h
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