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Old 08-28-2003, 08:07 PM   #1
Scooby Newbie
Member#: 38458
Join Date: Jun 2003
Location: Painesville, OH
2004 WRX Wagon

Default 04 driveability

I've got an issue with my '04 WRX Wagon (4400 miles, correct break-in procedures followed, no engine mods, etc...) that the dealer can't seem to cure. They've been cool about it, but no codes and no CEL have left me without a cure...
The search didn't work, so I apologize in advance if this has been covered!
When on the freeway in 4th or 5th gear, from around 3k rpm, if I squeeze (not "punch) to WOT, the boost comes up and the power seems to be there (perhaps a little off), but the car feels as though it has a minor "miss" as it accelerates. It seems to me that one of the things that sold me while test driving another WRX was the nearly seamless power after 3 grand, a feeling which is noticeably missing (no pun intended) in my own WRX.
The tech did a ECM reset, thinking that it may have "learned" my wimpy break-in driving style, and it seemed to lessen the problem for a while, but it is still occuring- no matter the weather or road conditions.
Any thoughts? Any help would be GREATLY appreciated!!!
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Old 08-31-2003, 06:22 PM   #2
Scooby Specialist
Member#: 12863
Join Date: Nov 2001
Chapter/Region: MWSOC
2002 2.5RS


Sounds to me like the familiar hesitation.

Do a search on the grounding mod. Basically the stock engine grounding spots suck and by simply adding more or fixing the ones you have it gives the ecm better signals from the engine sensors. It should smooth things out for you.
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Old 09-01-2003, 09:45 AM   #3
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I did some ground testing on my 04 and found that the ground is fine. I think Subaru fixed any grounding issues. I would recommend you reset your ECU yourself. Remove the - terminal on your battery and pump your brake pedal for 20 seconds to drain the battery. Reconnect and you are done. To awaken a few hidden ponies, you can also to the Vishnu Reset as well. View this thread to learn how to do it. For many, a simple ECU reset will eliminate the hesitation and some people think that this removes the hesitation, not the grounding mod since you are in essence doing this as a part of the grounding process.
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