Caladin
Junior Member
- Joined
- Mar 24, 2008
- Messages
- 175
- Reaction score
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- Location
- Abbotsford, BC, Canada
I've had a idle problem with my bike ('06) for some time. When you blip the throttle at idle the rpm's will drop from 1260rpm down to about a 1000rpm. The engine speed will usually pick itself back up after 5-6 seconds without being touched. The problem happens frequently but also operates normally sometimes. I have spent a fair amount of time trying to figure out the problem but cannot find anything wrong. I will list off what I have done/checked in an effort for some more suggestions as to where to look.
- TPS reads normal from 15 to 100 (no jumping around)
- Intake Air Pressure sensor reads correct and drops while cranking the motor
- Air temperature sensor reads correct.
- Air filter was just replaced.
- Throttle bodies were synchronized (using a mercury manometer and verified with a vacuum gauge).
- Spark plugs were all checked and in good shape.
- General check of boots and hoses to make sure all clamps are tight.
- Battery fully charged.
The problem seems to be worse when cold. When the engine is warm the rpm jumps back up within 1-2 seconds usually. I also have found that I sometimes cannot adjust the idle above 1260rpm. Even though the idle adjust screw is far from reaching the end of the adjustment. Attempting to increase the idle speed has no effect whatsoever on the idle speed. And dropping it back down also yields no change until it gets back to where it was previously set, at which point the rpm begins to drop as you turn the screw. Its like hitting an invisible wall the the rpm simply cannot be set over (this really stumps me).
Tomorrow I was planning on removing the TB's to look for any loose connections. As well as to try disabling the AIS to see if that has any effect. Any more suggestions as to things to check would be great. :thumbup:
- TPS reads normal from 15 to 100 (no jumping around)
- Intake Air Pressure sensor reads correct and drops while cranking the motor
- Air temperature sensor reads correct.
- Air filter was just replaced.
- Throttle bodies were synchronized (using a mercury manometer and verified with a vacuum gauge).
- Spark plugs were all checked and in good shape.
- General check of boots and hoses to make sure all clamps are tight.
- Battery fully charged.
The problem seems to be worse when cold. When the engine is warm the rpm jumps back up within 1-2 seconds usually. I also have found that I sometimes cannot adjust the idle above 1260rpm. Even though the idle adjust screw is far from reaching the end of the adjustment. Attempting to increase the idle speed has no effect whatsoever on the idle speed. And dropping it back down also yields no change until it gets back to where it was previously set, at which point the rpm begins to drop as you turn the screw. Its like hitting an invisible wall the the rpm simply cannot be set over (this really stumps me).
Tomorrow I was planning on removing the TB's to look for any loose connections. As well as to try disabling the AIS to see if that has any effect. Any more suggestions as to things to check would be great. :thumbup: