B
brhk1
Guest
Hello,
This is my first time using a message board so please excuse that I may not know the lingo etc!
I have a 1987 GN which I have owned since new. I store it every winter and drive it only on sunny days etc; as such it has only 41,000 km on it (yes I live in Canada!) or about 25,000 mi.
Last year my tranny started acting up, or at least I thought it was the tranny. It works fine when the car is cold but when it heats up (driving ~ 20 minutes on a good warm day) it starts lurching when you slow down. It appears to be stuck in a higher gear than it should be, shifting into the next lower gear at a much lower speed than it should. As you get down into 1st gear it lurches, acting as if the tranny is directly coupled to the engine and the engine now lurches in the low rpm range as you would expect with no slippage in the tranny or torque converter. Eventually as you come to a stop it disengages and the engine idles normally.
If you are in 2nd or 3rd gear and accellerate quite hard, the tranny will not downshift as it normally would unless you pin the throttle, at which point it shifts down into the next lower gear with a sharp bang, much sharper than it was prior to this problem. Again, these problems only occur when the engine and tranny are hot.
A friend owns an engine rebuild shop and I had him pull the tranny, which I took to a GM driveline specialty shop run by a guy who worked as a GM tranny man for 13 years. When I described the problem to him he came across as very knowlegable and appeared to know my tranny inside-out. He felt that it was likely just gummed up from lack of use and deteriorated seals etc. They pulled the unit apart and changed all the seals in the tranny and valve body, but didn't really find any noticeable problem. While the tranny was out we decided to have the torque converter rebuilt as well.
One last item - before we pulled the tranny we disconnected the wiring on the lock-up torque converter and it appeared to make a small difference but did not solve the problem. It was almost like the problem was simply magnified with the lock-up function engaged.
The car is now back together and you guessed it, the problem continues - absolutely no change. You can imagine how frustrated I am...
Can anyone give me some advice on what the problem might be and what next steps I should take? Any help would be very much appreciated.
Thank you!
This is my first time using a message board so please excuse that I may not know the lingo etc!
I have a 1987 GN which I have owned since new. I store it every winter and drive it only on sunny days etc; as such it has only 41,000 km on it (yes I live in Canada!) or about 25,000 mi.
Last year my tranny started acting up, or at least I thought it was the tranny. It works fine when the car is cold but when it heats up (driving ~ 20 minutes on a good warm day) it starts lurching when you slow down. It appears to be stuck in a higher gear than it should be, shifting into the next lower gear at a much lower speed than it should. As you get down into 1st gear it lurches, acting as if the tranny is directly coupled to the engine and the engine now lurches in the low rpm range as you would expect with no slippage in the tranny or torque converter. Eventually as you come to a stop it disengages and the engine idles normally.
If you are in 2nd or 3rd gear and accellerate quite hard, the tranny will not downshift as it normally would unless you pin the throttle, at which point it shifts down into the next lower gear with a sharp bang, much sharper than it was prior to this problem. Again, these problems only occur when the engine and tranny are hot.
A friend owns an engine rebuild shop and I had him pull the tranny, which I took to a GM driveline specialty shop run by a guy who worked as a GM tranny man for 13 years. When I described the problem to him he came across as very knowlegable and appeared to know my tranny inside-out. He felt that it was likely just gummed up from lack of use and deteriorated seals etc. They pulled the unit apart and changed all the seals in the tranny and valve body, but didn't really find any noticeable problem. While the tranny was out we decided to have the torque converter rebuilt as well.
One last item - before we pulled the tranny we disconnected the wiring on the lock-up torque converter and it appeared to make a small difference but did not solve the problem. It was almost like the problem was simply magnified with the lock-up function engaged.
The car is now back together and you guessed it, the problem continues - absolutely no change. You can imagine how frustrated I am...
Can anyone give me some advice on what the problem might be and what next steps I should take? Any help would be very much appreciated.
Thank you!
