General Category > Engine related issues
Rough Running R1200GS 2007
mike d:
Not only do I find the TPS suggestion strange, but apparently they didn't mention finding any issue with lambda sensor readings.
Latest update from Martin:
If they saw the unusual lambda readings, they didn't mention it, and I forgot to ask. I doubt they swapped the coils, either, since swapping the TPS had clearly not occurred to them until I mentioned it.
The throttle bodies came today, which was ultra-speedy, though not the lambda sensor; because it's all on ebay, they're separate orders. I've now swapped the idle actuators (and remembered to run the adjustment routine), the injectors, and the TPS (remembering to do the re-learn routine) and none of it has made any difference; it still stumbles like a drunkard just off idle. Here's hoping the lambda sensors sort it out – I'm running out of bits to replace!
Mike
Chris.S:
Was there ever a resolve to this problem.
If so an update would be good to store away in the brain cell for future use.
mike d:
Hi Chris,
The story's not finished yet.
The last work he did was to make a manometer (I was going to send him one), and check the throttle body balance.
Well, the bike has me completely flummoxed. I spoke to an independent specialist BMW mechanic; he said that my description of it stumbling just off idle was consistent with the primary coils breaking down. So I ordered a pair of new coils, plus a pair of used secondary coils; they made no difference whatsoever.
I put together a DIY vacuum gauge using lengths of clear plastic tubing and automatic transmission fluid; the bodies were considerably out of balance. They are now balanced at 2,000 rpm and above, though there's still a difference at idle. That's made it run a little better, but hasn't resolved the problems of it refusing to idle when cold, and stumbling/running rough between idle and 2,000 rpm.
He went on holiday yesterday, so a full update will be posted on his return.
Regards
Mike
Chris.S:
I will keep an eye on this post.
Regarding balancing, of the several sets of carb balancers I have I prefer the Morgan Carbtune Pro, with the steel rods.
I tend to balance the carbs at the point when the throttle butterfly`s are just starting to move, I feel that if they are right at this critical point then the difference at 2000 rpm and up wont make that much difference.
It would be nice to have them perfectly balanced all he way through but with the cables and plastic junction box that is not going to happen.
At the end of the day this does not account for the data reading on the one lambda sensor being wrong.
It is a shame that the AFR can not be measured on each cylinder just to confirm the data.
I guess I am spoilt having welded extra ports in the headers to take wide band sensors and using an Innovate LM2 to monitor AFR .
mike d:
Hi Chris,
I run the tool hire facility for the BMW Club (UK), and we also have a couple of Carbtune Pro's, which is what I offered to the member. Good piece of kit.
Mike
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