General Category > Engine related issues

Random Idle balance; Erratic Idle & rough running

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Austin:
just did the check on the Coil sticks.  No amount of wiggling of any of the connectors made any difference.  They also look to be in great condition anyway. 

Jughead:
Hi Austin

You ever resolve this issue?

Austin:

--- Quote from: Jughead on July 19, 2018, 09:30:05 PM ---Hi Austin

You ever resolve this issue?

--- End quote ---

Yes, I should have updated the thread.  A new Throttle Position Sensor seems to have sorted it.  :)  Very easy to fit and with a throttle body balance the bike was transformed.    I began to suspect it was the TPS after closely watching the readout for the TPS on the GS911, there was just a little flutter in the readout every now and then at tickover and despite holding the throttle absolutely rock steady at just off idle I was also getting small fluctuations in the readout.   Water ingress probably.  I know they can be cleaned/repaired with care but I got a Hella TPS for a BMW car.  There's a link on UKGSer somewhere to an Ebay seller.  £25 instead of £125.  It was worth a try at that price anyway.  Identical part. 

Jughead:
[emoji106]

Awesome.  Pleased you got sorted.

I purchased an accident damaged bike on auction about 2 weeks ago.  Had a very similar problem where the motor was very rough and sounded like it was only running on one cylinder, although both headers pipes were the same temperature.  Turned out to be the idle bypass valve that was faulty.

Have subsequently had a client's bike in with similar symptoms, also with a faulty bypass valve.

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