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Hard 1-2 shift
Hey all,
My 94 has a bad 1-2 shift, but all the other ones are great, It is usually pretty rough and abrupt. It seems to come and go, it seems better as the tranny warms up, but sometimes not. I don't have any of my tools here but next time I go to where they are stored I plan on breaking out the fluke to check the dropping resistor and the TPS. I searched but couldn't find anything in particular. There are no DTC codes being displayed, but I am thinking there could be an intermittent problem with the resistor that is not bad enough to cause an open or short, which all that will trigger a code I think. I am going to unplug it and see if it drives any different. Anyone have any thoughts?
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2007 GS 450h-Active Stabilizer/Radar cruise 1994 L Blue 3.70 VTD ASE Master Automobile ASE Advanced Level Specialist Toyota Master Diagnostic Technician (former life) |
#2
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Trouble shooter options
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The ATFG gives the following possible causes for hard 1-2 shift. 3 Faulty control unit 23 Valve sticking 13 Faulty 2A accumulator 10 Faulty throttle sensor 70 Deterioration of ATF 76 Poor engine performance These are listed in terms of most likely culprit first, next second, etc.... All can be tested on vehicle, i.e. without taking out the transmission. It's fairly easy to check your TPS, look up Trevor's How To above. The valve sticking and 2A accumulator, you have to drop the sump. As for faulty control unit, you could check if you had a bad connection to your TCU. Failing that swap in a spare or one belonging to a friend, see if the problem goes away. Naturally, change your ATF if it looks/smells bad. Best of luck, Joe
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Black Betty [Bam a Lam!] '93 UK spec, still languishing Betty Jersey Girl Silver '92 UK [Channel Isles] 40K Jersey Girl @ Mersea Candy Purple Honda Blackbird Plum Dangerous White X2 RVR Mitsubishi 1800GDI. Vantastic 40,000 miles Jersey Girl |
#3
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Thanks for the info, another thing I don't have here are my service manuals. It acts like it may be an accumulator, however. Let's hope not. I don't have a spare TCU, and there are no other SVXers around here that are on the net anywhere near me
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2007 GS 450h-Active Stabilizer/Radar cruise 1994 L Blue 3.70 VTD ASE Master Automobile ASE Advanced Level Specialist Toyota Master Diagnostic Technician (former life) |
#4
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You are welcome.
If you need scans or anything, say the word. I suspect you are right. An accumulator or a valve is what I would check also. Joe
__________________
Black Betty [Bam a Lam!] '93 UK spec, still languishing Betty Jersey Girl Silver '92 UK [Channel Isles] 40K Jersey Girl @ Mersea Candy Purple Honda Blackbird Plum Dangerous White X2 RVR Mitsubishi 1800GDI. Vantastic 40,000 miles Jersey Girl |
#5
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So I disconnected the dropping resistor, and it seems to have corrected the problem, it shifts almost perfect now on 1-2. all the others seem the same. This is not what I expected to happen. I think I can narrow it down to about 5 possibilities even without the ever informative section 2&3 book.
1. Worn Forward clutch. 2. Brake band Adjustment. 3. Bad resistor. 4. Accumulator 5. TPS Anyone have any other ideas?
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2007 GS 450h-Active Stabilizer/Radar cruise 1994 L Blue 3.70 VTD ASE Master Automobile ASE Advanced Level Specialist Toyota Master Diagnostic Technician (former life) |
#6
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Re: Hard 1-2 shift
My TPS was bad causing an extremely hard shift between 1st and 2nd.
Once I replaced it all was well..... amazing how much the TPS actually does. definitely check the TPS. -craig |
#7
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Re: Hard 1-2 shift
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Yes, a TPS involves a lot of things. Also, I have 2 different cars with "glitchy" TPS issues. On my silver there is a hard 1-2 shift (don't know about other gears since the high clutch is gone) and an occasional "stumbling" that happens only when the engine is cold and in cooler temps (50F or lower). On my laguna, all shifts are as they should be but the torque converter doesn't always lock/unlock when it is supposed to. No other issues related to the TPS on that one. |
#8
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Re: Hard 1-2 shift
Yeah Craig. Goo. Thing you told him 2 and a half years later.
Honestly though, my car is having the same issue so I found your post informative. Thank you.
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1992 Pearl White LS-L "Ruslana" #4946 - 180k on body, 95k on engine. Mods: ECU bead crush, 15 min mod, 20 min mod, drilled/slotted rotors & Axxis ceramic brakes, SS lines, 17" Evoke F1 wheels, XS-HF137 Sony Xplod speakers, 6000k HID's (lows & fogs), resistor mod, 1½" Sleek Spoiler mod, custom exhaust by svxfiles, '02 WRX aluminum racing radiator by svxfiles, Summit Racing 400# x 300# springs w/ Koni's by svxfiles, ClassGlass fiberglass hood /w scoop, Nevin's rear sway bar, '97 grille, phenolic spacers, custom LED interior lighting, custom paint. †"War doesn't determine who is right, only who is left"† Work to be done: Tinted windows, clear/LED tail lights, tailbar mod, "Power Mode" mod, Supertone horns, clear corners & headlight lenses, 2 pc splitters or custom bumper, Alcyone side skirts, TruSpeed Stage III SVX Intake, Hydra, 4.44 tranny swap, JDM auto folding side mirrors, engine rebuild, super charger, STi seats, bone leather interior /w SVX emblem, dash overhaul, SVX decals, paint (stock color). Total cost?: 22k At least it's going down..
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#9
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Re: Hard 1-2 shift
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Oh well ...... I'm glad it was informative to someone There are so many open ended threads.... the boards would be much more informative if everyone would go back and post how they fixed their problems. now let me go back and make sure I'm not guilty of that as well! -craig |
#10
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Re: Hard 1-2 shift
I agree. I find the posts really frustrating when people don't go back and put the solution in the final post. It should almost be mandatory.
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94 SVX LSI 2001 LegacyGT (daughter's ride now) 2005 Legacy outback XT (wife's car) all stock and likely staying that way for now 1981 Datsun 280zxturbo summer toy |
#11
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Re: Hard 1-2 shift
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#12
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Re: Hard 1-2 shift
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They replaced the valve with the right one to fix the problem. This was the thread. http://www.subaru-svx.net/forum/showthread.php?t=50242 Harvey.
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One Arm Bloke. Tell it like it is! 95 Lsi. Bordeaux Pearl, Aust. RHD.149,000Kls Subaru BBS wheels. 97 Liberty GX Auto sedan. 320,000Kls. 04 Liberty 30R Auto Premium. 92.000kls. |
#13
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Re: Hard 1-2 shift
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At the moment I am in communication with Pat Barrett at Level 10 regarding another matter. He will not be happy to hear of this accusation and the matter will not be left to rest.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#14
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Re: Hard 1-2 shift
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Your post was/is libellous in respect of Level 10. Correction and an apology is required and is called for.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
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