Lambda sensors

[Mikecocos]

Where are the connector ends of the lambda sensors on a 2014 v7? For clarity, I am not referring to the sensor ends on the exhaust pipes. Thanks.

[Mikecocos]

I found this pic in the service manual. I think it is taken from the side panel on the other side of the battery housing. Not sure though.

[pete roper]

The left hand cable snakes up behind the starter motor I expect, can’t remember exactly the route of the RH one but it’s easy enough to follow the cabling. Flat, four pin, plugs that go into the loom.

Please don’t tell me you’re going to put a pair of O2 sensor foolers on to it?

Pete

[Mikecocos]

Thanks for that Pete.

The other day on my ride home from work my bike reved uncontrollably. Then after starting and restarting the bike a couple of times and putting the bike in gear the Reving dissipated. Now the bike runs fine. I can’t replicate the problem. I thought one of the causes could be a faulty lambda sensor. If the issue recurs I was going to unplug the sensors and see if that fixes the issue. I would then replace the sensors.

I was also thinking or reflashing the ecu. My bike still uses the factory map. 2014 v7 stone.

[beetle]

Lambda sensors won't cause that. You might want to check for oil in the airbox.

[Mikecocos]

I have found oil in the airbox. But that is because I - like most other owners - use a little too much new oil when I change the oil.

Or is it something else?

[pete roper]

When you say ‘Revved uncontrollably’ do you mean simply a high idle, up to 2,500 or so, with no throttle application or was it screaming it’s head off and bouncing off the limiter?

If the latter you need to check your cable routing and throttle body cam carefully as there is nothing apart from a jammed open throttle plate that will allow it to do that.

If the former it could be a gummed up throttle plate and/or stepper due to oil contamination.

Pete

[Mikecocos]

Reved steady at 5 to 6k. No throttle application.

[pete roper]

Something had to have been jamming the throttle I think. I don’t believe the stepper could get it to hold such a high engine speed. I might be wrong but I doubt it.

Pete

[Mikecocos]

Thanks. I�ll take a look at the throttle body.

Excuse the ignorance - what is an a stepper?

[beetle]

The idle stepper is a motor controlled valve that assists in getting the engine to idle correctly.

Pete, I was thinking the MAP sensor may have been blocked by oil. It adds fuel as the MAP approaches atmospheric. Excess fuel can make it idle high, but 6000 RPM? Only if the butterfly was stuck open at the same time.

[pete roper]

Ah yes, I’d forgotten it uses a MAP sensor.

[malik]

I have found oil in the airbox. But that is because I - like most other owners - use a little too much new oil when I change the oil.

Or is it something else?

How much oil in the airbox? When my 2014 Special was fairly new to me, I got caught in bumper to bumper traffic in the heat (36-38C) - experienced rough running, surging idle, smell of unburnt fuel - it felt seriously sick - and limped home, stopping to cool the motor down 3 times in the 15km back. The air filter was dirty and oily, the airbox was dirty & oily and the throttle bodies dirty & the plugs fouled. Cleaning the airbox & the inside of the manifolds & throttle body, a new filter & new spark plugs solved the problem & there has never been a repeat of those symptoms. 1.9L of engine oil seems to be enough to avoid oil affecting the breathing.

The lambda connectors? If you haven't found them before then I shall soon be able to confirm their siting definitively - there's an oil film in the bell housing & the clutch is slipping, so the bike is going to come apart for a new clutch & to replace the seal that's leaking. Oh joy.