- Joined
- Mar 15, 2021
- Messages
- 5
1999 Chevrolet S10 LS (2.2L, Automatic, RWD, Short Bed, Regular Cab, 231,000 Miles).
Hello, new to the forum and I am trying to diagnose an issue with my Chevrolet S10. It slightly lurches forward when the brakes are applied to slow down or stop. It is very slight. I would describe the feeling to be similar to a vehicle with warped rotors. I “think” the issue is with the transmission (4L60E) or torque converter. No service engine soon light or stored codes. I am thinking that the torque converter may not be fulling disengaging. No decrease in engine RPM when the lurch occurs. Engine has never stalled during the lurch either. Transmission is the factory build. No slipping and it shifts quietly, smoothly and the torque converter locks up.
I serviced the transmission less than a year ago (ACDelco Dexron VI Fluid, ACDelco Pan Gasket, and ACDelco Filter). Fluid looked and smelled like new and was at the proper level. Transmission pan magnet was and has also been very clean during services. I decided to service the transmission again about a month ago and replace the torque converter clutch solenoid, thinking it may be the issue. I also replace the 1,2 and 3,4 solenoids and the torque converter pulse width modulation solenoid. New filter, fluid, and pan gasket as well. All parts where GM or ACDelco. Unfortunately, the lurch is still present.
I don’t think it is chassis related (worn control arm bushings, engine mounts, rear end axle/leaf spring wrap, end yoke, universal joints, etc.). What leads me to believe this is, if I accelerate the vehicle up to 45 mph (torque converter is locked), remove my foot from the accelerator, allow the vehicle to slow to about 20 mph, shift the transmission into neutral, and then apply the brakes to slow down and stop, the lurch is not present. The brake pedal is solid with normal travel, and no vibrations can be felt or noises heard.
I am early to apply the brakes and I apply the brakes lightly (just my driving style). I have applied the brakes with more force to determine if the lurch is still present, and it is, but is slightly less noticeable.
Any ideas? Am I on the right track to diagnosing the issue? Just a note, I am the second owner of the vehicle. I purchased the vehicle when it was three years old and I was 17 (2002). Still my daily driver 19 years later. All maintenance has been performed by me.
Appreciate the ideas and help.
Hello, new to the forum and I am trying to diagnose an issue with my Chevrolet S10. It slightly lurches forward when the brakes are applied to slow down or stop. It is very slight. I would describe the feeling to be similar to a vehicle with warped rotors. I “think” the issue is with the transmission (4L60E) or torque converter. No service engine soon light or stored codes. I am thinking that the torque converter may not be fulling disengaging. No decrease in engine RPM when the lurch occurs. Engine has never stalled during the lurch either. Transmission is the factory build. No slipping and it shifts quietly, smoothly and the torque converter locks up.
I serviced the transmission less than a year ago (ACDelco Dexron VI Fluid, ACDelco Pan Gasket, and ACDelco Filter). Fluid looked and smelled like new and was at the proper level. Transmission pan magnet was and has also been very clean during services. I decided to service the transmission again about a month ago and replace the torque converter clutch solenoid, thinking it may be the issue. I also replace the 1,2 and 3,4 solenoids and the torque converter pulse width modulation solenoid. New filter, fluid, and pan gasket as well. All parts where GM or ACDelco. Unfortunately, the lurch is still present.
I don’t think it is chassis related (worn control arm bushings, engine mounts, rear end axle/leaf spring wrap, end yoke, universal joints, etc.). What leads me to believe this is, if I accelerate the vehicle up to 45 mph (torque converter is locked), remove my foot from the accelerator, allow the vehicle to slow to about 20 mph, shift the transmission into neutral, and then apply the brakes to slow down and stop, the lurch is not present. The brake pedal is solid with normal travel, and no vibrations can be felt or noises heard.
I am early to apply the brakes and I apply the brakes lightly (just my driving style). I have applied the brakes with more force to determine if the lurch is still present, and it is, but is slightly less noticeable.
Any ideas? Am I on the right track to diagnosing the issue? Just a note, I am the second owner of the vehicle. I purchased the vehicle when it was three years old and I was 17 (2002). Still my daily driver 19 years later. All maintenance has been performed by me.
Appreciate the ideas and help.