04 wrx power loss - Subaru WRX Forum
 
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post #1 of 15 Old 08-30-2011, 02:13 AM Thread Starter
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04 wrx power loss

hey everyone, i just recently bought an 04 wrx about 2 months ago....i have noticed a few things wrong with the car since ive bought it and am having no luck diagnosing them the idle is a little rough and sounds like there might be a slight random missfire and while driving the car feels sluggish. I have a boost gauge installed and the needle flutters a little at idle around 20 in hg and when at peak boost the needle flutters betweeen 12 and 14psi....on another note at deceleration i hear a strange scraping noise that i can only describe as sounding like a brake rotor being turned. thinking it might be a start to a slipping clutch cause it only happens in gear and goes away when clutch pedal is depressed

Tests ive done:
1. compression test-150 psi in all 4 cylinders
2. checked fuel pressure which came out good
3. cleamed maf and replaced filter
4. cleaned iac valve
5. done a boost leak test
6. changed spark plugs
7. there is no cel and no stored codes in the ecm

this has been driving me crazy and any help or similar experiences will be greatly appriciated
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post #2 of 15 Old 08-30-2011, 06:43 AM
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Sounds like you need a new throw out bearing...

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post #3 of 15 Old 08-30-2011, 06:52 AM
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What kind of boost gauge is it? Mechanical/Electrical... Also, ANY aftermarket parts installed on the car? Did you buy it from a dealer or an individual ?

Paul
2002 WRX Sold
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2007 STi totaled
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post #4 of 15 Old 08-30-2011, 05:32 PM Thread Starter
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thanks for the replys guys, i really appriciate the feedback....the boost gauge is a mechanical one, relatively cheap one and ive been thinking it could just be the gauge causing the flutter. as far as aftermarket parts all it has is a k&n filter and an axle back(back potion) exhaust so the cats are all still there. one other thing i might note is that the snorkle on the stock air box was missing when i bought it, could that cause a lean air fuel mixture? well today im gonna be scanning the car and looking at the short and long term fuel trims and sensor values to try to get so insight on the problem!
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post #5 of 15 Old 08-30-2011, 05:33 PM Thread Starter
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oh yea i for got to add that i bought it from a small dealer....
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post #6 of 15 Old 08-30-2011, 10:07 PM
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the throw out bearing only spins when the clutch pedal is applied sound almost like a bearing though my car had the same noise right be fore i grenaded a output shaft on the trans mission still have to open it up yetbut my guess a bearing was so worn inside it wore on a shaft or something i would check your fluid levels in your diff and trans mission an look for a silver looking color oil

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Last edited by diesel paul; 08-30-2011 at 10:09 PM. Reason: didnt finish
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post #7 of 15 Old 08-30-2011, 11:05 PM Thread Starter
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well i plan on changing the clutch pretty soon so we'll see what i find after i drop the tranny....now the issue im really concerned about is the lack of power, its not a horrible amount, but noticable when compared to my friend wrx....today i plugged it up to a scan tool to check the values of the map, maf, o2 sensors, and long and short term fuel trim and everything checked out. so my guess now would either be a clogged injector or one of the coils is about to go out....im pretty stumped so if anyones ever experienced the same symptoms please let me know. thanks
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post #8 of 15 Old 08-31-2011, 06:46 AM
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So there is no way to pinpoint the misfire?

It's not giving you a specific cylinder? I would try this out:

Switch the coils around every few days, it MIGHT give you a hint after the first set of changeouts.

Paul
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2007 WRX Sold
2007 STi totaled
2007 Foz XT sold
2007 MS3
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post #9 of 15 Old 08-31-2011, 11:26 PM Thread Starter
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cool, thank you for the advice pzr2874, ill give it a try and see how it goes....i ment to look at the cylinder missfire count in mode 6 on the scan tool at my school, that might be an easier way lol
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post #10 of 15 Old 09-01-2011, 09:53 AM
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Document which misfires are happening EACH time they happen...

Paul
2002 WRX Sold
2007 WRX Sold
2007 STi totaled
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post #11 of 15 Old 09-01-2011, 10:19 AM
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Garage
Turbo could be going bad.

My name is Ken and I am a HP Junkie.
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post #12 of 15 Old 09-01-2011, 04:41 PM Thread Starter
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is there anything to check for to see if it could be the turbo, and also could an exhaust leak cause power loss as well. i figure it could seeing as how turbos rely on the exhaust to spool up....well today ill check for missfires on the scan tool and maybe plug the smoke machine up to it and see if theres any signs of leaks. once again thanks everyone for their input
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post #13 of 15 Old 09-01-2011, 09:37 PM
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If the exhaust leak is pre turbo you will notice a serious lack of power...post turbo...not to much to notice except the noise it will create.

Kirt
378awhp/373wtq Custom Dom 3 & CBRD tuned 2006 STI.
"When in doubt...flat out" - Colin McRae
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post #14 of 15 Old 09-01-2011, 09:45 PM
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Throwout bearing

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post #15 of 15 Old 09-02-2011, 12:06 AM Thread Starter
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well good news i did the missfire count today with the scan tool and sure enough cylinders 2 and 4 were both missfiring though not enough to throw a code. cleared the memory and switched the to the other side and they moved so i will be ordering two new coils. thanks everyone who gave tips and pointers i greatly appriciate it now time to find that pesky noise i keep hearing probably gonna order a new clutch when i order a timing belt for my 105 change...
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