Breva 1100 - Low Idle Speed |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Measure twice, cut once. Worth going back and rechecking.
However that won't have changed so if the idle etc has then its probably not that. |
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Tris
Senior Member Joined: 01 Jun 2015 Location: Lincolnshire Status: Offline Points: 406 |
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Totally agree re measure twice! I've made a little fixture to help me get everything square
The existing sensor appears a bit swollen and definitively isn't square to the flange, so for the price they are I've ordered a replacement |
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2017 V9 Roamer
2005 Breva 1100 - sold 1994 California - sold |
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Petros GR
Falcone Joined: 08 Feb 2017 Location: Greece Status: Offline Points: 36 |
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I would use guzzidiag to look the oxygen (lambda) sensor reading. After its heated up it should fluctuate at any value between 100 and 900 mV. Lambda reading afects how the engine runs when under 3000 rpm...
If the sensor reads normal, I would try to raise the idle, using the "CO trim" actor. The defalult trim value is 0 (zero). I would start by seting it to, lets say 50, and see how it goes, increasing or decreasing it according to the result of the previous value. This value represends milisec added (or substructed if negative) to the duration of the fuel injection. As CO trim value is added (or substructed) for all engine operation, going too high (or low) can result in running rich (or lean), so even if i could get the iddle at 1200, I would later check the plugs to see if the bike runs rich
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Tris
Senior Member Joined: 01 Jun 2015 Location: Lincolnshire Status: Offline Points: 406 |
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I've measured and remeasured everything about 20 times now using 3 different techniques now and keep getting the same answer - original air gap was set at 0.9mm
The good news is that one of the shims is 0.3mm thick so if I pull that I get the right answer - wahoo Once the new sensor arrives tomorrow I'll start to stick it back together and see where we are Petros I'll bear that in mind, but I thought unless the Lambda sensor is disabled via Guzzidiag, then the Autolearn would dial it back out over time Edited by Tris - 11 Jul 2018 at 07:30 |
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2017 V9 Roamer
2005 Breva 1100 - sold 1994 California - sold |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Bear in mind the new sensor may not be exactly the same dimensions so you will have to check again.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Tris
Senior Member Joined: 01 Jun 2015 Location: Lincolnshire Status: Offline Points: 406 |
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Thanks for the reminder Brian but if I'm lucky it will simply be "plug and play"
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2017 V9 Roamer
2005 Breva 1100 - sold 1994 California - sold |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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That is why the shims are there.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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David_M
Falcone Joined: 19 May 2018 Location: Daventry Status: Offline Points: 83 |
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Do you mean 'Plug and Pray'?
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David_M
LM V, V50 iii |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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I wouldn't put the new one in assuming the gap will be correct. |
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"Chicken nuggets don't dance on a Tuesday."
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Tris
Senior Member Joined: 01 Jun 2015 Location: Lincolnshire Status: Offline Points: 406 |
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Well he's back together with no bits left over ... which is always nice
The good news (bar final tuning) is that it looks like its sorted as he fired straight up and settled down to a proper idle If I blip the throttle now there are no pops and bangs and no tendency to stall/idle low I can't be certain as I disconnected and re-made pretty much every connection of the engine management side, checked every component against the specs and replaced all 4 plugs but the only issues I found were with the Cam sensor
I'll report back once I have been for a ride and finessed the tuning Thanks for everyones' input
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2017 V9 Roamer
2005 Breva 1100 - sold 1994 California - sold |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Yes, that's quite possible, those sensors do fail.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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