ebaron
02-20-2017, 07:43 AM
2001 XC70 163K miles
Owned for about 10 yrs. Car was in slight front wreck which insurance totaled, but we kept it as a backup car and just replaced hood, bumper etc. Just trying to save the car at low cost, due to our prior maintenance, parts and general condition. I'm able to do most work and have a lift. Ok maybe now it's just a challenge. plus I have a bunch of spare parts from the body parts car purchased.
It sat for 1.5 months if that matters.
After 1 week back on road, would not go into gear on an extra cold day (~ 20f) outside. Would not go forward or reverse, no engagement. It was always garaged previously. 1 week later, warmer day, goes into gear and take it for a few mile drive. Forward gears and reverse work normal. Car sat for another week, and again, no forward or reverse. Did hear whirring sound under hood near trans.
We've had the shift flare issue with this car for about 7 years since about 70-80 K. have done multiple flushes done at dealer or home, over the years, with slightly improved results each time. Dealer checked software. Shift flare came and went. Changed B4 servo cover at 150K and did gibbons method flush. Slight improvement.
Just learned about the valve body kit from Transgo, so for $100 valve body and gasket kit, I figured it was worth a try, vs spending $900 on rebuilt body. Valve body is an early model 'A'. Rebuild went well, fluid was not bad, looked relatively clean, noticed no significant wear. Used all parts in kit and rebuilt linear solenoids, and they operated smoothly after cleaning. Did not seem bad to begin with. All linear and shift solenoids checked out electrically.
Just completed and it was the same at first, no engagement. Checked, added fluid, then some engagement, then its gone. Still Heard a whirring sound at transmission under hood which quieted slightly changed as it warmed up. Torque converter?
Put on generic code reader. ' P0740 Torque Convertor Clutch Open' comes up. I clear code and restart. It goes into forward and reverse! Very firmly, excellent engagement. Back out of garage, lots of froward and reverse, drive up driveway, and I can feel it slip and then gone, no drive or reverse. No codes this time. I reset codes anyhow, and it goes into gear, not as firmly as before, but I get it back to garage.
So, even though we've had the flare issue with this trans for years, The fluid hasn't looked very bad and it doesn't look bad now, so I'm thinking the trans is still good, as when it ran, it shifted well, no slipping etc.
I'm thinking either the solenoid controlling the torque converter fluid pressure is messed up ( not sure which) or I have a failing torque converter due to the whirring sound. I'm thinking the latter. Should I check fluid pressure at one of the ports ( have never done that, can use tips), before trying a convertor?
I know one answer is just replace entire trans or give up, but it shifted well, short of occasional flare and I'm trying to keep investment low and save this as a backup car. I've already invested this much time, I'm willing spend some time to do covertor if it may work.
Over the years, we routinely had another code come up regarding one Of the solenoids. I need to look up the code recorded, but that is why I went through with the valve body rebuild.
Thanks for any advice or experience.
Owned for about 10 yrs. Car was in slight front wreck which insurance totaled, but we kept it as a backup car and just replaced hood, bumper etc. Just trying to save the car at low cost, due to our prior maintenance, parts and general condition. I'm able to do most work and have a lift. Ok maybe now it's just a challenge. plus I have a bunch of spare parts from the body parts car purchased.
It sat for 1.5 months if that matters.
After 1 week back on road, would not go into gear on an extra cold day (~ 20f) outside. Would not go forward or reverse, no engagement. It was always garaged previously. 1 week later, warmer day, goes into gear and take it for a few mile drive. Forward gears and reverse work normal. Car sat for another week, and again, no forward or reverse. Did hear whirring sound under hood near trans.
We've had the shift flare issue with this car for about 7 years since about 70-80 K. have done multiple flushes done at dealer or home, over the years, with slightly improved results each time. Dealer checked software. Shift flare came and went. Changed B4 servo cover at 150K and did gibbons method flush. Slight improvement.
Just learned about the valve body kit from Transgo, so for $100 valve body and gasket kit, I figured it was worth a try, vs spending $900 on rebuilt body. Valve body is an early model 'A'. Rebuild went well, fluid was not bad, looked relatively clean, noticed no significant wear. Used all parts in kit and rebuilt linear solenoids, and they operated smoothly after cleaning. Did not seem bad to begin with. All linear and shift solenoids checked out electrically.
Just completed and it was the same at first, no engagement. Checked, added fluid, then some engagement, then its gone. Still Heard a whirring sound at transmission under hood which quieted slightly changed as it warmed up. Torque converter?
Put on generic code reader. ' P0740 Torque Convertor Clutch Open' comes up. I clear code and restart. It goes into forward and reverse! Very firmly, excellent engagement. Back out of garage, lots of froward and reverse, drive up driveway, and I can feel it slip and then gone, no drive or reverse. No codes this time. I reset codes anyhow, and it goes into gear, not as firmly as before, but I get it back to garage.
So, even though we've had the flare issue with this trans for years, The fluid hasn't looked very bad and it doesn't look bad now, so I'm thinking the trans is still good, as when it ran, it shifted well, no slipping etc.
I'm thinking either the solenoid controlling the torque converter fluid pressure is messed up ( not sure which) or I have a failing torque converter due to the whirring sound. I'm thinking the latter. Should I check fluid pressure at one of the ports ( have never done that, can use tips), before trying a convertor?
I know one answer is just replace entire trans or give up, but it shifted well, short of occasional flare and I'm trying to keep investment low and save this as a backup car. I've already invested this much time, I'm willing spend some time to do covertor if it may work.
Over the years, we routinely had another code come up regarding one Of the solenoids. I need to look up the code recorded, but that is why I went through with the valve body rebuild.
Thanks for any advice or experience.