Yes that should force open-loop fuelling for all operating conditions. If problem goes away there’s the culprit.
Innovate afr meter arrived today however had to pop over to view and see why a mates Triumph custom won’t spark. Second hand coils - secondaries appear burst unfortunately. Weather tomorrow shocking so it’s wire up the MTX meter up to the V7 Stone and wait for decent weather (gauge not IP) to check not too lean with lambdas out of loop to ECU. Waiting on 70sfan Oxford ride results; he’s running without them too…
So completed Oxford ride, with warm up and cool down at both ends, and no problem at all. This week, running without Lambdas since Monday, I have done two short trips of about 10 miles each, one medium of about 25 miles and then the Oxford trip yesterday which is about 100 miles. I’ve tried all road conditions from town traffic, to motorway and no problems experienced. So thanks for the advice. I think we have found the culprit. The key question is what to do about it - run without them permanently (what are the consequences) or stump up over £70 for a new sensor or possibly two?
Has the FineBeau Forge Lambda sensor mod been considered.
I have a similer device on my 750 Breva and it transformed it.
Hi Ian - both Peter and myself run, or rather ran Daves kit. I removed them when the first issue cropped up late last year - on return from Kinlochleven weekend with the Central Scot boys. Peter has taken FF gizmos out of the equation too meantime I believe. Had a quick run last year to see if anything changed before winter struck with lambdas disconnected but nothing conclusive - too short a run. Reconnected sensors 2 weekends ago (No FF fitted still) and on the Sunday return (after overnight stop and circa 65 miles) got the “bogging down” at part throttle. Daves kit does work. I fitted mid 2014 after a ecu reflash at a warranty service and was pleased with the injection characteristics - until the KLL trip.
There appears to be some issue with the ecu / lambda set up. Whether the reputed ecu “self learning” gets mixed up or sensors go out of calibration or heaters die - still to early to tell.
Hopeful that the afr meter will tell me just what disconnecting the sensors does to the mixture below 4k rpm for now whilst checking the sensor(s) for breakdown.
Cover me - I’m going in…
I have been running with the FInebau gizmo for about a year until this problem started. I quickly took that out as I thought it might be the cause of the problem, and I have left it out whilst the investigation continued. As Gavin and I have both been running Finebau and both have problems with lambda sensors I’m suspicious of it now. I agree that when it was attached and the lambda sensors were working correctly the low speed running was transformed from snatchy and jerky to normal (like carburettors - oh for the good old days!)
Well mine is on the older 750 Breva and is homemade job from Pete the Bees.
Ithas done about 6,000 miles and transformed the bike.
Sorry to hear of your problems.
I think both the editor and Payl Hartely have run Stones with this mod.
Yup - Roger Shuff has experienced the same prob too, if I am not mistraken.
Tosh & V7Stone.jpg
Decided to do battle with bloody Windose crap and driver stuff to see what’s in the MuiG3 “brain” of the V7 Stone. Fraught with ports, stop bits, latency, USB drivel, driver ineptitudes and other Gatesian bollox I finally sat down with a glass of red and stared at Penelope Cruz on the screen whilst wondering what to do next.
Bingo… it speaka ma language…
Anyone know what a P0611 is?
P0611 Fuel Injector Control Module Performance
Is it now. Wonder what that really means.
Just thought I’d report in. I’ve now been running without the lambdas for a tankful of fuel, and there is no difference to the fuel consumption! I’m still getting roughly 60 mpg, which is the same as it was both with and without the finebau forge product and the lambda sensors connected.
It’s missing some signals ~ either duff sensors or bad electrical connectors. It’s struggling to make sense of what’s going on with the fewer inputs, ergo it can’t get the AFR right.
Might even be experimenting with different ratios.
The V50 has taken up man cave time, haven’t got around to sticking AFR meter on V 7 yet. If fuel economy is similar then that could mean open loop below 4k rpm is not piston threatening. I need to run the bike with ‘guzzi diag’ in place to see what is giving grief, not sure how to balance a laptop on the machine yet though.
Edit: wonder what happens if you only disconnect one?
Open loop should not be piston threatening at any time! It’s when the computer uses it’s basic fuelling map. Closed loop is when the O2 sensor in the exhaust is used to detect oxygen, this is where the ECU is leaning off the mixture (for emissions reasons) but cannot go too lean obviously or as you say a holed piston may result, hence it’s a delicate balancing act and needs a correct lambda signal.
or not, evidently. Just ordered some st/st bungs to fit the M18 holes when I remove and carefully package the lambadabadabada sensors for the useless bin. I will however run the test on AFR, just to be happy.
Running the sensors disconnected won’t do them any good as they need the heater elements to prevent damage from hot gases. Hence complete removal in my case.
how many wires are there in the lambda prob connector? i’m surprised that they would be heated on a bike with the limited amount of power from the charging system
4 cores - it’s an expensive Bosch unit (needlessly so IMHO). The heater is a small ceramic doofer so takes little power.
Penelope Cruz? - I just get to poke my fingers down the back of the carbs on the old V50.