91VR4AT
Probationary Member
- 1
- 0
- May 10, 2018
-
Kaitaia,
New Zealand
Hi, I am a bit unsure about the recent trouble I am having with my trans.
I have a JDM 1991 VR4 Galant A/T. I have fitted a RVR Turbo trans (FM6) and transfer case after the original trans failed. It has a IPT shift kit fitted, using the recommended street settings. I'm running an E316g at around 14psi, so nothing crazy. The only other thing is it is running a chipped manual ECU, so I don't know if this possibly problematic.
Just recently I maybe had a couple of warning signs, first, it slipped in 2nd after kicking down to overtake, I rolled out the throttle and it changed back up to 3rd. Next time, after pulling up to my gate, and putting it in neutral, once I got back in the car and put it back into drive, it just free revved for a moment and then clunked into gear. Finally, I went to leave my house, reversed fine, then put it into drive, nothing. Tried swapping between 1-2-D, nothing, then with a bit of a rev, it clunked into 1st gear. I haven't driven it since then.
I have been through the checklist from the A/T service manual, and checked:
linkage adjustment - okay
fluid level - okay, maybe a touch high
fluid condition - from memory, it has about 6000 miles, of mainly highway use, no racing, filter was changed at the same time. I have dropped the fluid today, still looks okay, no sparkles, color closer to red than brown
testing PCSV and SCSV solenoids operation manually - all okay
voltage to PCSV and SCSV - not 100% sure, SCSV a&b were around 9-10v, and I don't have a duty cycle function, but the PCSV was reading around 4-5v on digital meter
According to the checklist next most likely causes are: rear clutch or piston, valve body, low line pressure, then: torque convertor, oil pump, one-way clutch. Rear clutch or piston, and the one-way clutch are the only causes on the checklist that aren't associated with reverse as well, but are common to the forward gears, so I'm guessing one of these is most likely. Any thoughts? Searching for "rear clutch" has brought almost no hits, so is this an uncommon failure? How about the one-way clutch?
Thanks, Mike.
I have a JDM 1991 VR4 Galant A/T. I have fitted a RVR Turbo trans (FM6) and transfer case after the original trans failed. It has a IPT shift kit fitted, using the recommended street settings. I'm running an E316g at around 14psi, so nothing crazy. The only other thing is it is running a chipped manual ECU, so I don't know if this possibly problematic.
Just recently I maybe had a couple of warning signs, first, it slipped in 2nd after kicking down to overtake, I rolled out the throttle and it changed back up to 3rd. Next time, after pulling up to my gate, and putting it in neutral, once I got back in the car and put it back into drive, it just free revved for a moment and then clunked into gear. Finally, I went to leave my house, reversed fine, then put it into drive, nothing. Tried swapping between 1-2-D, nothing, then with a bit of a rev, it clunked into 1st gear. I haven't driven it since then.
I have been through the checklist from the A/T service manual, and checked:
linkage adjustment - okay
fluid level - okay, maybe a touch high
fluid condition - from memory, it has about 6000 miles, of mainly highway use, no racing, filter was changed at the same time. I have dropped the fluid today, still looks okay, no sparkles, color closer to red than brown
testing PCSV and SCSV solenoids operation manually - all okay
voltage to PCSV and SCSV - not 100% sure, SCSV a&b were around 9-10v, and I don't have a duty cycle function, but the PCSV was reading around 4-5v on digital meter
According to the checklist next most likely causes are: rear clutch or piston, valve body, low line pressure, then: torque convertor, oil pump, one-way clutch. Rear clutch or piston, and the one-way clutch are the only causes on the checklist that aren't associated with reverse as well, but are common to the forward gears, so I'm guessing one of these is most likely. Any thoughts? Searching for "rear clutch" has brought almost no hits, so is this an uncommon failure? How about the one-way clutch?
Thanks, Mike.
