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Old 10-16-2000, 08:45 AM   #1
Necromancer
Scooby Specialist
 
Member#: 477
Join Date: Oct 1999
Location: Vancouver
Vehicle:
GC4 -> GGA -> GM6
Yeah, that's about right.

Post Attn Kevin Thomas -- your ailing AT

Hey Kevin, I moved this from the other thread about Mike Jerry's car to avoid intruding there:

Quote:
[ referring to your car, not Mike Jerry's ]
So far, it looks like the tranny is the weak link. In 3rd gear when accelerating abruptly, the revs rise very quickly then fall back down and pick up slowly again. But if you take care, it should last for quite a while. Had a compression test done on June and all cylinders where within specs.
Have you diagnosed this problem mechanically yet? I guess it could be anything from worn friction linings to low pressure in the system, but it would be interesting to see where that point of failure is. No problems with 1st and 2nd gear even after all those drag races?

Could it be that the torque convertor is slipping excessively and what you're describing is the lockup function? Have you checked your ATF for viscosity / strawberry milkshake disease?

TIA!

Cheers,
Joe

'97 Impreza "2.2RS"
Tamiya WRC Acadia Green baby!!!

[This message has been edited by Necromancer (edited October 16, 2000).]
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Old 10-16-2000, 09:01 AM   #2
Kevin Thomas
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Join Date: Jul 1999
Location: 1997 OBS, 1996 SVX, 1988 RX
Vehicle:
1989 1989 XT6

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Have you diagnosed this problem mechanically yet?

No I haven't. Took the car to the dealership *twice* and they can't seem to find anything wrong in the way the car shifts. It only does this when accelerating during high speeds, not from a standing start. At the drag strip, the 1/4 mile times are consistent and it doesn't 'slip' like it does on the highway.

No problems with 1st and 2nd gear even after all those drag races?

Not that I can tell. 1st gear shifts on a dime (6200rpm) and 2nd gear now shifts between 6300-6400 rpm. 2nd to 3rd gear shifts is noticeably long and annoying. But my 1/4 mile times are still the same. (?)

Could it be that the torque converter is slipping excessively and what you're describing is the lockup function?

It's possible. I don't have a clue.

Have you checked your ATF for viscosity / strawberry milkshake disease?

Had my stock spec tranny fluid changed back to synthetic two weeks ago at RalliSpec. Mobile 1 ATF is in now. Yes, I was concerned to, so I asked RalliSpec if they could check out the oil and tell me what they thought of it. They did not notice anything unusual about the tranny oil. And this is from regular non-synthetic tranny oil. A Haynes tranny cooler was installed too along with the change to Mobile 1 ATF so if anything is wrong, maybe it'll prolong it from getting worse.

Also, after getting the tranny oil and cooler put in (as well as vent bonnet scoop), my 1/4 mile time actually dropped by .1 - .05 seconds and mph went up. If my tranny is bad, this shouldn't happen I would assume. Iím confused!

I don't know if the 2.5 Legacy GT ECU and the stock TCU (Transmission Control Unit) are communicating correctly, causing the unusual shifts either. I no longer have my stock ECU to find out. It was misplaced. (Anyone have a spare 1997 2.2ltr ECU I could use?)




[This message has been edited by Kevin Thomas (edited October 16, 2000).]
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Old 10-16-2000, 10:07 AM   #3
XT6Wagon
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04 STi
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Sounds like you are going in the right direction. The auto trannies need lots of cooling and fresh fluid to transfer the most power.

High speed problems seem to indicate a problem with the lock up feature of the torque converter. Most carmakers only have the torque converter lock in 3rd and 4th.
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Old 10-17-2000, 12:10 AM   #4
DLC
out back
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My 93 Turbo Legacy has had this happen a few times at highway speeds.

The RPMs will climb about 1500-2000, the power light will come on, then it'll settle back down. It didn't happen on the way to SLC this weekend but it did when going to Pocatello.

90k miles...
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