Idle problem, need help please

[Pat O]

Wondering if you could try to help me out. I have a 2009 Gen 2 VMax with 2100 miles, when it reaches operating temp it will not idle, starts right back up though and accelerates fine. Cold start is fine. Once it reaches operating temp, if I unplug the temp sensor on back of the head it will idle. I changed the temp sensor and it stl does the same thing. Any suggestions on what it may be or what I should test would be very much appreciated. Thank you and have a great day.

 

[Jack Hammer]

Since you are not stating any other symptoms, I'd check fuel system pressure and replace fuel filter.

 

[MaxMidnight]

With all of the control systems on the bike any suggestions we make will be guesses. We may strike lucky but probably not.
First step would be to get a copy of the Service Manual, the second would be to check for any error codes and the third would be to work through the diagnostic procedures.
That will be the quickest and cheapest way to find the problem.

 

[ShawnD]

A 14 year old bike with 2100 miles? I'd bet serious money it's fuel related...how long does the bike sit without being ridden? That's seriously low mileage & that is never good for a motor. Gas degrades you know. I'd start running fuel treatments through it.

 

[Pat O]

Thanks for the input so far, still no luck... Bike has 2100 miles, took it to the dealer, had the TPS wiring harness (and oil pump recall) done and it still will not idle once the temp gets to 1/2 way on the gauge. Installed 4 new plugs, same thing! Idles fine until temp hits 1/2 way mark, then you must hold the throttle to get it to idle. No other issues at all -- good power etc... Fuel pump is new. Any suggestions would be greatly appreciated. Thanks

 

[Traumahawk]

The throttle bodies do need to be synced, like the carbs do. It's a place to start.

 

[Parminio]

The throttle bodies do need to be synced, like the carbs do. It's a place to start.

Reading this, I first thought of the idle jet problem on the Gen1 that you shotgun to clean out. Sounds just like it.

 

[Coastal Grey]

Run SEAFOAM through it

 

[Graham]

Sounds like it is coolant heat related as when it gets to a certain temp the ecu is either richening or leaning the mixture. You said you changed the temp sensor so I would next check the wire from it to the ecu with an ohm meter to ensure it is within tolerance. These things are hard to chase but that is what I found on my car efi system. Same thing it was doing.

 

[Traumahawk]

Just wondering how your coming along with this. Have you searched out any diagnostic codes as well?