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Old 01-04-2016, 10:59 AM   #1
acewayne
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Member#: 434010
Join Date: Nov 2015
Default 04 WRX Lack of Power

Backstory. 04 WRX with 135k on it. Bought the car knowing it needed to maintenance and tune up. It had codes for a TGV being stuck closed, TGV sensor, and exhaust temp sensor. Upon putting gas in it for the first time I noticed it would stop pumping every few seconds and I would have to start again. It also had a leaky power steering pump and lack of power, it didn't really pull/accelerate at all.

Fast forward a bit. Parts taken off, replaced, and some maintenance done. Timing belt, water pump, power steering pump were all replaced. TGV's were taken off, cleaned, and the sensor was replaced. The front mount that was on the car was taken off and replaced with an OEM STI TMIC and BPV. The AEM intake was replaced with a Cobb SF intake and the stock inlet was replaced with a Perrin inlet. An accessport was added and tuned for stage 1. The fuel filter was also replaced.

Currently, aside from the lack of power and the gas pumping issue the car runs fine. However, it does feel like a 100hp car with no power whatsoever and 12PSI. When I go WOT it'll slowly make its way up to 5kish rpm, starts misfiring, and won't go above that. It wasn't showing any codes until last night when I attempted it again and the CEL was flashing and the code indicated a cylinder 2 misfire. I plan to change the plugs next, but at this point I'm not sure what could be causing the lack of power. I suppose checking the fuel pressure after the spark plugs will be next. Any suggestions?

TLDR:
04 WRX, stage 1 with cobb intake, perrin inlet, and STI TMIC.
Lack of power, hardly accelerates feeling like 100hp but builds 12 PSI.
Recent code was cylinder 2 misfire.
Plugs to be changed soon but doubt that will solve the problem.
Issue occurs regardless of stock or stage 1

I'm pretty new to subaru's so it's all still a learning experience. I own a 09 GTI as well so that's what I'm more familiar with.
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Old 01-04-2016, 11:07 AM   #2
Sammythebugeye
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Join Date: May 2015
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Is there a reason you have not replaced the fuel pump?
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Old 01-04-2016, 12:09 PM   #3
monkeyposeur
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Member#: 333468
Join Date: Sep 2012
Chapter/Region: RMIC
Location: SLC, UT
Vehicle:
1993 SS
03 WRB GD 205/22T 20G-XT

Default

I'd do a compression and leakdown test before throwing any more parts at it aside from the plugs. A flashing CEL misfire can be indicative of a burnt valve among other things. The CEL may be causing the car to go into limp mode.

You can try moving the coil pack from cylinder 2 to another location. If the misfire follows to the new location then you know the coil pack is the issue.

My 03 WRX had the flashing CEL and it was caused by a burnt valve.
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Old 01-04-2016, 02:31 PM   #4
Trick_WRX
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Default

Sounds like your car might be in Limp Mode. My car (03 WRX, close to stock) just lost the cat in the downpipe, which clogged the exhaust pretty good and it went into limp mode. It felt exactly how you're describing so, not saying you've got the same cat issue but that something, possibly that misfire is putting the car in limp mode.

Hopefully one of the Gurus on here can jump in and help you out more.
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Old 01-05-2016, 03:52 PM   #5
acewayne
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Default

Quote:
Originally Posted by Sammythebugeye View Post
Is there a reason you have not replaced the fuel pump?
No reason. I haven't checked the fuel pressure yet. I plan to like I said in the OP after I do the plugs.

Quote:
Originally Posted by monkeyposeur View Post
I'd do a compression and leakdown test before throwing any more parts at it aside from the plugs. A flashing CEL misfire can be indicative of a burnt valve among other things. The CEL may be causing the car to go into limp mode.

You can try moving the coil pack from cylinder 2 to another location. If the misfire follows to the new location then you know the coil pack is the issue.

My 03 WRX had the flashing CEL and it was caused by a burnt valve.
I plan to do a compression test when I change the plugs when I get time.


Quote:
Originally Posted by Trick_WRX View Post
Sounds like your car might be in Limp Mode. My car (03 WRX, close to stock) just lost the cat in the downpipe, which clogged the exhaust pretty good and it went into limp mode. It felt exactly how you're describing so, not saying you've got the same cat issue but that something, possibly that misfire is putting the car in limp mode.

Hopefully one of the Gurus on here can jump in and help you out more.
Could be. How did you know you "lost your cat?" No cat inefficiency code or anything? No CEL? Only a misfire code?
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