OK two things, probably the same cause though.
2011 GSA 83,000 miles. Valves in tolerance (just) last time I checked.
1. Random throttle balance
See this video filmed today after fiddling about with throttle cables and connectors to TPSs, Idle Valves, & Injectors in an attempt to find a cause for fault 2. At around 10 seconds, 33 seconds and 55 seconds the balance goes off the scale with no input from me other than holding the throttle above tickover (the gradual rising and falling of engine speed and associated gradual changes in balance are me - the sudden and extreme changes in balance are random and unexplained). I am using GS911 so the idle stepper motors are parked. Any thoughts? I did eventually get the balance to be around zero at 3,000ish rpm.
2. Before I did this I have been suffering for some months of an intermittent and random poor tickover and roughness. Both come and go randomly together but never seem to last too long. I have had the GS911 on when it was doing the poor tickover thing and nothing seemed to have changed in real time values from when it was running OK. The poor tickover is either an erratic tickover pulsing of around 1200 - 1500 rpm, or a complete unwillingness to tickover. It feels and sounds like the engine is waaaay out of balance when it does this - hence my though that 1 & 2 are linked. In both cases of erratic tickover and roughness if I just weight the throttle the tiniest bit it runs ok(ish) and somewhat smoother - but revs are up to about 1500rpm. When its doing this if I ride it then it feels out of balance, and quite rough - lumpy rather than buzzy. Switching ignition off/on has cleared it but most times not.
The symptoms have NOT appeared on a proper cold engine, and most commonly occur after a long closed throttle slow down or when hot like in traffic.
Over the past couple of months I have had the following faults: Left Hand Lambda Sensor value out of range. New sensor fitted - no change. I also got hold of a used set of 4 stick coils. No change, I am back on the originals now. I had a knock sensor fault the other day - value too high, but that could be caused by anything. I have reset adaptations and done idle valve calibration umpteen times. Nothing simple like this seems to cure it.
Real time values on the GS911 all seem to be OK, specifically the lambda values are (now) both in range and jump about as they are supposed to. Other values that are also paired all seem to rise and fall together except for the Knock sensors which have a significant difference. Not sure if that is normal not or what a typical value should be.
Edit.....the additive Trim adaptation values also seem to differ quite a bit for each cylinder, but not sure what the scale is. -3.19% one side -3.98% the other. (an adaptation reset puts these back to zero and the ECU then learns what adaptation to apply).
Any ideas anyone.
Oh, and the flat spot between about 5,000 and 6,000 rpm seems to gone bigger than ever.
2011 GSA 83,000 miles. Valves in tolerance (just) last time I checked.
1. Random throttle balance
See this video filmed today after fiddling about with throttle cables and connectors to TPSs, Idle Valves, & Injectors in an attempt to find a cause for fault 2. At around 10 seconds, 33 seconds and 55 seconds the balance goes off the scale with no input from me other than holding the throttle above tickover (the gradual rising and falling of engine speed and associated gradual changes in balance are me - the sudden and extreme changes in balance are random and unexplained). I am using GS911 so the idle stepper motors are parked. Any thoughts? I did eventually get the balance to be around zero at 3,000ish rpm.
2. Before I did this I have been suffering for some months of an intermittent and random poor tickover and roughness. Both come and go randomly together but never seem to last too long. I have had the GS911 on when it was doing the poor tickover thing and nothing seemed to have changed in real time values from when it was running OK. The poor tickover is either an erratic tickover pulsing of around 1200 - 1500 rpm, or a complete unwillingness to tickover. It feels and sounds like the engine is waaaay out of balance when it does this - hence my though that 1 & 2 are linked. In both cases of erratic tickover and roughness if I just weight the throttle the tiniest bit it runs ok(ish) and somewhat smoother - but revs are up to about 1500rpm. When its doing this if I ride it then it feels out of balance, and quite rough - lumpy rather than buzzy. Switching ignition off/on has cleared it but most times not.
The symptoms have NOT appeared on a proper cold engine, and most commonly occur after a long closed throttle slow down or when hot like in traffic.
Over the past couple of months I have had the following faults: Left Hand Lambda Sensor value out of range. New sensor fitted - no change. I also got hold of a used set of 4 stick coils. No change, I am back on the originals now. I had a knock sensor fault the other day - value too high, but that could be caused by anything. I have reset adaptations and done idle valve calibration umpteen times. Nothing simple like this seems to cure it.
Real time values on the GS911 all seem to be OK, specifically the lambda values are (now) both in range and jump about as they are supposed to. Other values that are also paired all seem to rise and fall together except for the Knock sensors which have a significant difference. Not sure if that is normal not or what a typical value should be.
Edit.....the additive Trim adaptation values also seem to differ quite a bit for each cylinder, but not sure what the scale is. -3.19% one side -3.98% the other. (an adaptation reset puts these back to zero and the ECU then learns what adaptation to apply).
Any ideas anyone.
Oh, and the flat spot between about 5,000 and 6,000 rpm seems to gone bigger than ever.
MPG on the computer back up to 54mpg, super smooth, pulls like a train from low revs, flat spot all but gone, starts without touching the throttle. I am a happy boy 
A couple of trips this week should add another 500 this week all the adaptations should have developed nicely by then too so I am expecting it to get better and better. 
