I'm not sure the best term or description for this issue. I'd say it's always been present in this car, but I feel it's become worse lately.
My best description is that when letting off the throttle with the car in gear, the driveline will start slapping forward and backward, with a sort of rhythm. It is EXTREMELY annoying. I can't get it to happen 100% of the time, but it is quite frequent.
For example, say I'm cruising at 35mph in 4th gear and approach a stop sign. As I let off the throttle (no matter how gently I let off) and let the car coast in gear as the RPMs slowly drop, the driveline will start bucking. This bucking motion builds upon itself and can get pretty violent. I can stop this by de-clutching.
I'm wondering if my engine/trans mounts have something to do with this. They're probably 5-6 years old at this point, the engine mounts are stock M20 parts, the trans mounts are the green painted OEM M5 mounts I believe, installed by the PO.
Perhaps its the combo of those softer front of driveline mounts with the stiff rear mounts I have? I have AKG 80A rear subframe mounts and an OEM M Roadster/Coupe diff bushing.
Any thoughts please let me know, this is starting to really bother me.
Thanks.
My best description is that when letting off the throttle with the car in gear, the driveline will start slapping forward and backward, with a sort of rhythm. It is EXTREMELY annoying. I can't get it to happen 100% of the time, but it is quite frequent.
For example, say I'm cruising at 35mph in 4th gear and approach a stop sign. As I let off the throttle (no matter how gently I let off) and let the car coast in gear as the RPMs slowly drop, the driveline will start bucking. This bucking motion builds upon itself and can get pretty violent. I can stop this by de-clutching.
I'm wondering if my engine/trans mounts have something to do with this. They're probably 5-6 years old at this point, the engine mounts are stock M20 parts, the trans mounts are the green painted OEM M5 mounts I believe, installed by the PO.
Perhaps its the combo of those softer front of driveline mounts with the stiff rear mounts I have? I have AKG 80A rear subframe mounts and an OEM M Roadster/Coupe diff bushing.
Any thoughts please let me know, this is starting to really bother me.
Thanks.
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