Help 7AT acting strange after car was in body shop for seven weeks
#1
7AT acting strange after car was in body shop for seven weeks
2009 G37x Automatic Coupe, 74k miles
I've done a lot of searching and found a lot of discussion on throttle lag and slow shifting but I don't think any of them really line up with my specific issue.
I know absolutely nothing about transmissions so my description will be terrible...
Sometimes when I'm off the throttle for a few seconds like at a stop sign or turning a corner then apply the gas the car will act like it is in neutral, rev, and take a few seconds to catch a gear. The harshest example I can think of is when I was at a stop sign that was uphill, moved my foot from the brake to the gas and gravity started rolling the car backwards like it was in neutral while it revved to a few thousand RPM before engaging a gear and moving forward like everything was fine. This type of thing has also happened turning corners, off the throttle -> turn the corner -> back on the throttle and the car acts like it's in neutral for a second in the same way.
I've had a short, rough history with this car.
It's really hard to describe the problem, if anyone has any ideas please let me know. I did the ECU reset a few times with no noticeable results. I'm lost.
I've done a lot of searching and found a lot of discussion on throttle lag and slow shifting but I don't think any of them really line up with my specific issue.
I know absolutely nothing about transmissions so my description will be terrible...
Sometimes when I'm off the throttle for a few seconds like at a stop sign or turning a corner then apply the gas the car will act like it is in neutral, rev, and take a few seconds to catch a gear. The harshest example I can think of is when I was at a stop sign that was uphill, moved my foot from the brake to the gas and gravity started rolling the car backwards like it was in neutral while it revved to a few thousand RPM before engaging a gear and moving forward like everything was fine. This type of thing has also happened turning corners, off the throttle -> turn the corner -> back on the throttle and the car acts like it's in neutral for a second in the same way.
I've had a short, rough history with this car.
- I bought it "cheap" with a rebuilt title May 15th, it seemed fine. It looked like it would need some new brakes in the next year or so but nothing alarming. The idle would fluctuate a bit, down to the 500rpm marker at times so I cleaned the throttle bodies and it seemed solid after that.
- I hit a deer a few weeks later, I think June 1st or so. It took a lot of body damage and my insurance company surprisingly valued the car way higher than I paid for it and covered it. I didn't get it back from the body shop until July 23rd.
- When I picked it up from the shop I noticed a brake piston was stuck and drove it straight home and parked it until I got that fixed, I didn't notice the shifting issue but there were no stops. It is irrelevant but I replaced rear rotors, pads, and the back left caliper so far and the brakes are solid.
- The next time I drove the car I noticed the transmission weirdness. I've only been driving it when I have to and have around 100 miles of small town / back country driving on it so far and nothing has really changed. I've learned to give it time to figure itself out so it isn't taking off at 3000+ rpm.
It's really hard to describe the problem, if anyone has any ideas please let me know. I did the ECU reset a few times with no noticeable results. I'm lost.
#2
Registered Member
Could your accident have affected anything where the transmission cooler and/or lines have been damaged? Did the body shop have to remove or replace any items related to the transmission and possibly neglect to refill or check the fluid? I would have your fluid checked ASAP. Good luck
#3
Could your accident have affected anything where the transmission cooler and/or lines have been damaged? Did the body shop have to remove or replace any items related to the transmission and possibly neglect to refill or check the fluid? I would have your fluid checked ASAP. Good luck
Last edited by nkarasch; 08-02-2018 at 12:22 AM. Reason: Moved text above estimate image
#4
Could your accident have affected anything where the transmission cooler and/or lines have been damaged? Did the body shop have to remove or replace any items related to the transmission and possibly neglect to refill or check the fluid? I would have your fluid checked ASAP. Good luck
Reading the symptoms of low ATF makes me think that has to be the cause, I wish there was an easy way to check it.
Last edited by nkarasch; 08-02-2018 at 04:58 AM. Reason: Vague initial post
#6
I just started having similar issue with my 2010 g37s sedan. while driving to work it was jerky when shifting and would get stuck in D it would not listen when I shifted to sport (manual mode) and would also not listen to the paddle shifters when I would try to manually shift the car.
I also noticed that it would not let me use the shift know to shift it manuall in sport mode. Had to pull over and turn the car off and open the door then restart to be able to restore it. it happened 3 times on a 20 minute commute
never given me any issues before.
and thoughts would be greatly appreciated. would low fluid be a cause? I haven't seen any leaks.
I also noticed that it would not let me use the shift know to shift it manuall in sport mode. Had to pull over and turn the car off and open the door then restart to be able to restore it. it happened 3 times on a 20 minute commute
never given me any issues before.
and thoughts would be greatly appreciated. would low fluid be a cause? I haven't seen any leaks.
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