Hi guys,
Been on this forum a while and replies have been spot on before so thought it worthwhile to give you something to think over. I will try to keep it as simple as I can.
Basically when starting my AYGO second-generation with MMT gearbox when I release the brake and the car creeps forward on its own momentum (as it is a automatic/manual robotized automatic) there is a shudder and vibration. Quite bad at times. Interestingly this goes away after only 1-2 minutes of driving (sometimes even less). Issue is worser when car has been stood for a while (3 + days). Issue has been present for two years. Not present when car bought new. Issue is worse in reverse gear. More vibration and juddering.
I still cannot figure out if this is engine related or clutch. However one very interesting thing I discovered is that when the car creeps forward the RPM of the engine drops dramatically. Two LED bars drop for those who know the AYGO instrument cluster/dashboard. That to me seems to be stating the car is trying to stall. And yet when the engine has driven for those 1-2 minutes those drops do not occur...
I wonder what this is then. Is the ECU malfunctioning or is the start-up procedure compromised. Maybe there is not the correct mixture of air/fuel upon start-up so maybe the sensors are off. I keep being told it is clutch related and I know there are threads that say similar. However I am unsure as I do not seem to have the classic signs of a clutch wearing out. The issue resolves itself for the most part, as indicated earlier, by just getting the car running/warmed up within 1-2 minutes. However in reverse issue is still present (although a lot better) after getting the car warmed up. Something is telling me (my gut) that it is rev (RPM) related. The revs are too low and no doubt this could be the case in reverse gear. When I let the reverse gear go to its maximum speed (let the car run back as fast as can be) then again the vibration and shudder goes away.
Any help would be appreciated.