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  #1  
Old 08-15-2007, 02:35 PM
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Transmission jumping gears on highway.

My transmission is acting annoying.

1. In fourth, at highway speed (45-60 mph) it will jump from 4 to 3 for a second, then back to 4, hold that for a while (seconds, minutes, it varies), and do it again.

2. It also seems slow to lock the torque converter in 4th; it's revving maybe 1-200 RPM high at 60. When it's at the normal revs at 60 it stays there solidly without shifting.

3. About half the time I get a hard 1-2 upshift.

I've searched around and found a bunch of possible causes and solutions. Bad TPS, bad tranny resistor, brake band needs adjustment, transmission not reaching normal operating temperature, torqu converter gone gimpy, general tranny apocalypse...

I'm leaning toward bad TPS, because I also have an annoying hesitation from 1200-1600RPM, very much like there's a dead zone in the throttle. I'd like to know peoples thoughts on what else it could be though.
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Old 08-15-2007, 04:46 PM
jeffast jeffast is offline
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thats basicially what mine did when the tps was bad, changing it fixed the fast shifting around, and the slow lockup
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Old 08-15-2007, 06:05 PM
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Both 92s we have had those symptoms, plus another when the TPS was worn, both were fixed when TPS was replaced($197 each, 1st Subaru)..The third symptom was the idle speed. It would start off ~600-700rpm then increase to about 900-950rpm 15 to 20 minutes later...
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  #4  
Old 08-15-2007, 06:34 PM
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Alright thanks guys, sounds like the TPS is the culprit. The major one at least.

I don't have the third symptom you described, processengr. My idle remains constant, according to the emmisions test I had done today, at 654 RPM, after about 30 minutes of driving.

Passed the emmisions test with flying colours too.

If anyone else has an opinion or thoughts on the matter, feel free to chime in.
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92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping
2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos
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  #5  
Old 08-15-2007, 08:04 PM
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Tps

I cleaned my throttle body out a few months ago, and had the same problem! Turned out I hadn't plugged the TPS in completely
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