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Old 12-29-2011, 04:46 PM   #1
Hidenplanvew
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2004 WRX
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Default Transmission slipping?

Ok short and sweet...

Pulll car into garage to fix abs issue, runs fine and everything is good

Pull car out to go get emissions and in first gear the engine revs and speedo goes up but not going anywhere... (slipping clutch would be tach going up but no speed)

Baby it to emissions, does a quick pass w/o a problem (we have dyno emissions here) and while one the way back get mad at car slipping and launch alittle harder then normal and clutch catches and car takes off.

Since speedo gear is in trans (correct me if im wrong) I dont understand why the speedo would climb too

2004 wrx (ej205)

Any input would be great
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Old 12-29-2011, 08:24 PM   #2
TwoFifty
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Im pretty sure, (feel free to correct me if im wrong anyone) but the speedometer reads off of the wheel speed sensors and not a sensor in the trans, therefore this would explain the speedometer still working when clutch was slipping. RPM i believe is controlled by a sensor in the transmission, and this would still rise unless the sensor was bad.

Does sound a lot like a slipping clutch issue, does it get worse as the clutch gets hotter at all?
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Old 12-29-2011, 09:23 PM   #3
Hidenplanvew
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The weird part is the RPMs, and Speedo stay the same one dosent move faster then another... I was thinking if the clutch was slipping then rpms would rise while speedo was slower. Im thinking it is the clutch slipping it was just weird because it did it really bad in first I pretty much had to take off in 2nd and stay out of boost.
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Old 12-30-2011, 12:01 AM   #4
Hidenplanvew
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anyone?
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Old 12-30-2011, 09:46 AM   #5
aperson
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If the clutch is slipping then the speedo wouldn't be moving. The problem is after the clutch. I'd check to make sure all your axles are still connected and together before assuming the trans.
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Old 12-30-2011, 11:02 AM   #6
drewmob
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I'm guessing you pulled a front cv out of joint fixing your abs issue.
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Old 12-30-2011, 01:28 PM   #7
Hidenplanvew
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well I didnt actually pull any of the axles or anything, it was a wiring harness issue. I will go check them tho to make sure I didnt hurt anything. Any other ideas of what to check? If I can find anythingI think im going to take out that trans and do my legacy gt trans and diff swap.. and do a stage 2 or 4 clutch
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Old 12-30-2011, 11:59 PM   #8
Hidenplanvew
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anything else to check? before I get to crazy
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Old 12-31-2011, 08:34 PM   #9
Hidenplanvew
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Anymore things to look for? if not here I come clutch
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Old 01-01-2012, 10:14 PM   #10
fire_chimp
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Check that your one of your axles hasn't popped out. This sounds almost identical to the issue I was having. Turned out that the driver side axle would pop out on occasion, and Id get a weird vibration, grumbling noise. I drove mine for a week or so with it doing this and ended up replacing the viscus clutch in the transmission, rear drivers side axle, and swapped the rear end out with another as the end of the drive shaft was all chewed up and figured the differential was also damaged inside. I now know there is a TSB about the axles popping out.
I hope you caught it soon enough and didn't do what I did.
Here is the TSB that I was referring to.

SOURCE: Subaru Tech Tips
TITLE: Clutch Appears to Be Slipping
APPLIES TO: Impreza WRX
SERVICE TIP:
If you encounter an Impreza WRX with a customer concern that the vehicle's clutch slips under hard acceleration but drives normally under light acceleration, it might not be the clutch that's the problem. Before you yank the transmission to get to the clutch, put the car on the lift. Start the engine and put it in gear. Release the clutch and see if all four wheels are turning. If they are not, inspect the one that is not turning. The Technical Support Line has received a couple of calls with the above concern and in both cases the retaining clip on the inner end of the rear axle shaft has come off. This allows the axle shaft to move outward slightly to disengage from the side gear of the rear differential but, the wheel bearing retainer assembly will not allow the axle to come out completely. Since these vehicles have a limited slip rear differential, there is enough drag on the axle to move the car under light acceleration but not under heavy acceleration.
The repair is simple. Just push the axle inward and it should reengage the retaining clip. If this procedure does not work, then you will need to remove the rear differential cover to re-install the clip and/or examine the axle. If the vehicle is an Impreza WRX STi, you might find that the vehicle won't move unless the DCCD is in the 'Manual' mode. In this case the cause may be a failed rear axle shaft or joint assembly
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Old 01-02-2012, 10:24 PM   #11
fire_chimp
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any update? did you find out whats up yet?
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Old 01-04-2012, 05:56 PM   #12
m.o.b.s.
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Staying tuned...

My new Exedy clutch just arrived and it came with a note about the above TSB. Now I gotta go "make my clutch slip" to see if my speedo goes up. I've noticed the RPMs rising during "the slip", but not speed.
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