Fault-tracing information
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Condition
Knocking and rasping is primarily caused by how engine torque changes when gear changing. This is controlled by the engine control module (ECM). The transmission is a passive component which (together with the engine / chassis mountings) absorbs torque from the engine.
Possible Source
- Defective engine control module (ECM).
Fault symptom[s]
- It is hard to drive the car smoothly in low gears at slow speeds
- The car jumps when parking
- Metallic knocking sound from the transmission when changing gears under load
- There seems to be a lot of play in the transmission.