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Discussion Starter #1
Hi all,

I've been posting this issue on another forum, but I'm really getting to the end of my rope and thought I'd see if anyone here can help. Here's a (not so brief) summary of the bike's behavior and what I've done.

2005 R6 ~ 9,000 mi

Bike surges at idle and sometimes when I've been riding for while or revving hard, it will surge through such a wide RPM range it just dies. I've looked at numerous things and can get the bike to idle perfectly if I unplug one of two sensors, the Intake Air Pressure sensor or the Atmospheric Pressure sensor.

The old Intake Air Pressure sensor tested ok as per the service manual, but I replaced it anyway, thinking that would fix the problem. Nope. Then I tested the Atmo sensor and it tested out of range high on the multimeter. I just received a replacement today (taken off a 2008 R6S, same part number), and it doesn't fix the issue either.

The vacuum at the intake sensor shows to be almost the same as at the #3 throttle body takeoff. Slightly higher, so I don't think I have a vacuum leak. I also think if I had a vacuum leak, unplugging those sensors wouldn't help at all. I mean it's like a switch. Sensors connected, idles like crap. Sensors disconnected, idles great.

Anyone have any ideas?

Chris
 

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Discussion Starter #2
Update. Removing the aftermarket slip-on (Level One Racing) and reinstalling the stocker fixes the idle issue. That still doesn't explain the out of range reading at the atmo pressure sensor. I wonder if the test range given in the manual is incorrect.

The LOR pipe is pretty much straight through. Would the drastic reduction in back pressure result in the idle surge behavior?

I have a PCIII (currently disconnected). Tried the LOR and Graves tune and neither fixed the surge. Would a custom tune do the trick?

Chris
 

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Discussion Starter #3
Just talked to Yamaha and they confirmed that the 3.75 to 4.25 working voltage on the atmo sensor is correct, so my reading is out of range. I really have a hard time believing that this sensor is bad, even though it is a used item from an '08 R6S, but I suppose it could be. It's a $200 gamble to see if a new one fixes the bike.

Chris
 

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Hi all,

I've been posting this issue on another forum, but I'm really getting to the end of my rope and thought I'd see if anyone here can help. Here's a (not so brief) summary of the bike's behavior and what I've done.

2005 R6 ~ 9,000 mi

Bike surges at idle and sometimes when I've been riding for while or revving hard, it will surge through such a wide RPM range it just dies. I've looked at numerous things and can get the bike to idle perfectly if I unplug one of two sensors, the Intake Air Pressure sensor or the Atmospheric Pressure sensor.

The old Intake Air Pressure sensor tested ok as per the service manual, but I replaced it anyway, thinking that would fix the problem. Nope. Then I tested the Atmo sensor and it tested out of range high on the multimeter. I just received a replacement today (taken off a 2008 R6S, same part number), and it doesn't fix the issue either.

The vacuum at the intake sensor shows to be almost the same as at the #3 throttle body takeoff. Slightly higher, so I don't think I have a vacuum leak. I also think if I had a vacuum leak, unplugging those sensors wouldn't help at all. I mean it's like a switch. Sensors connected, idles like crap. Sensors disconnected, idles great.

Anyone have any ideas?

Chris
I had same issue and I had two basically cut wires on the stator connection. Cut all 5 wires and solder direct and eliminate connector
 
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