Hey Guys,
I picked up my new SQ4 a few weeks ago with 70 miles on it. It now has a 1000 miles on it. Unfortunately, I seem to have a serious problem with car.
It happens intermittently when I floor the car, the RPM rises all the way to 7000 RPM but the transmission does not switch to next gear or it switches extremely violently.
If it does not switch, I lift my foot off of the gas and one of these things happen:
1- The car drives fine and switches fine as long as I don't floor it again (even if I go 90% of the way there)
2- The car goes into limp mode (limits the RPM to 3000)
3- The car starts bucking and eventually stalls
A power reset usually does the job so I think it is a sensor/computer problem.
Debug History:
A couple of weeks ago when I first noticed the problem, I took the car to the dealer and he said that there was nothing wrong with the car and that system didn't have any errors in it. However, the mechanic pointed out that I should wait for BOTH the transmission and the engine temperatures to rise to operational mode (Half way on the dial) before I floor the car.
Followed his advice but a day later still faced the same problem. This time the service engine sign came on when the car stalled. I took it back to the dealership and they read the faults:
1- Knock sensor as the car redlined with the transmission didn't switch gears
2- Implausible data from the transmission: The dealer explained that this means that the combination of: speed, gear, and gas pedal location didn't make sense to the transmission
The dealer filed a case with Meserati and they suggested that we reset the learned values in the adaptive transmission and drive the car gently for the next 200 miles to establish a new baseline. The dealer did that.
I took the car back and tested it again, same problem! This time it even did it one time at highway speed. Floor it and it won't switch gears, 90% of the way down and it does.
The dealer basically told me to wait until I hit 1K miles and check again.
Unfortunately, I can't replicate the problem on demand so I can't show it to the dealer. Having said that, the problem seems to happen much more often when I just start the car (even if it is still hot from a previous trip)
Has anyone seen this problem or does anyone have any suggestion on how to further debug this issue?
Cheers
I picked up my new SQ4 a few weeks ago with 70 miles on it. It now has a 1000 miles on it. Unfortunately, I seem to have a serious problem with car.
It happens intermittently when I floor the car, the RPM rises all the way to 7000 RPM but the transmission does not switch to next gear or it switches extremely violently.
If it does not switch, I lift my foot off of the gas and one of these things happen:
1- The car drives fine and switches fine as long as I don't floor it again (even if I go 90% of the way there)
2- The car goes into limp mode (limits the RPM to 3000)
3- The car starts bucking and eventually stalls
A power reset usually does the job so I think it is a sensor/computer problem.
Debug History:
A couple of weeks ago when I first noticed the problem, I took the car to the dealer and he said that there was nothing wrong with the car and that system didn't have any errors in it. However, the mechanic pointed out that I should wait for BOTH the transmission and the engine temperatures to rise to operational mode (Half way on the dial) before I floor the car.
Followed his advice but a day later still faced the same problem. This time the service engine sign came on when the car stalled. I took it back to the dealership and they read the faults:
1- Knock sensor as the car redlined with the transmission didn't switch gears
2- Implausible data from the transmission: The dealer explained that this means that the combination of: speed, gear, and gas pedal location didn't make sense to the transmission
The dealer filed a case with Meserati and they suggested that we reset the learned values in the adaptive transmission and drive the car gently for the next 200 miles to establish a new baseline. The dealer did that.
I took the car back and tested it again, same problem! This time it even did it one time at highway speed. Floor it and it won't switch gears, 90% of the way down and it does.
The dealer basically told me to wait until I hit 1K miles and check again.
Unfortunately, I can't replicate the problem on demand so I can't show it to the dealer. Having said that, the problem seems to happen much more often when I just start the car (even if it is still hot from a previous trip)
Has anyone seen this problem or does anyone have any suggestion on how to further debug this issue?
Cheers