IACs started in 2011. Jts probably glued over so you cant see it. I would try bumping up your TPS slightly. It could also be caused by bad TPS wiring,

 

Curt, my ride is a 2008 500EFI with an IAC. The following is from a Pure Polaris 2008 service manual, and a photo of what I think is the IAC on my ride. Any way to adjust it? A replacement is expensive.

ELECTRONIC FUEL INJECTION​

EFI COMPONENTS​

Identification / Location​

1.​

Electronic Control Unit (ECU)​

Located under the seat on the driver’s side.​

2.​

Manifold Absolute Pressure Sensor (MAP)​

Located on top of the intake manifold.​

3.​

Intake Air Temperature Sensor (IAT)​

Located in the rubber intake boot between the air box and​

throttle body.​

4.​

Idle Air Control (IAC)​

Located on top of the Throttle body

 

I have to confess, that surprises me. I wasnt aware the 500s used the IAC 3 years before the 800s did,

 

This is not the only thing strange about this model. The TPS voltage is supposedly
1.10 to 1.14vdc.
Just have to wait for a helper to read while I probe.
I had hoped it was just the TPS setting off but that was checked at the dealership...wait maybe I had better double check that! Just seems strange that it is only one little spot opening the throttle that I have the problem.

 

.......I wasnt aware the 500s used the IAC 3 years before the 800s did,

Nor was I.

I can remember there being some confusion about the TPS setting on the 500, as that spec' was not listed in older service manuals......which forced those with TPS issues to buy a completely new throttle body, as the TPS was not available separately at one time (although it may be now).

Because I've had very little "hands-on" experience with the 500 engine, I have struggled to help those with the TPS question in the past. That's the reason I asked you for that spec' in another thread.

I'm not sure if it applies here, but several members with the '11 and newer 800 have had issues with their IAC (broken wires leading to it and dirty sensor). If the wires check out to be good, you may want to disassemble it and clean the sensor.

 

"Is this still most likely a tps issue as the problem is when the throttle is advanced just over idle?
I know the answer is with the forum members somewhere if I keep on digging!"


Well, the IAC checks out good. The TPS is set to correct voltage and shows smooth voltage increase when opening throttle, checked with a KMP Performance kit. Manifold temp sensor and signals good. Manifold barometric pressure sensor and signal good. I am still stumped guys. As stated when engine is at idle and I tap the throttle the engine will either stall or hesitate and catch up. About 7 out of 8 times it will just hesitate and catch up. When it does stall out it seems easier to start back up with throttle added.

 

Man, I don't know.....this is a tough one. It sure sounds like a TPS problem.....but if it checks out as being okay......

You've already checked the fuel pressure, correct?

 

It runs like a scalded dog once past the little blip. No problems at all at high rpm's and under load. Should I still check the fuel pressure? I have no Schrader valve for an easy check.

 

Carl, Have you checked for codes recently ?

 

Yes. Just came back from dealership 200 hour service and tune up including their digital wrench hook up charge. No codes except for start sequence and end of test code.
The tech did offer to look at it again when I can get it hauled back to them. I did not check it out before I left the dealership with it DUMB ME!

 

Carl, "Is there a pressure regulator in the assembly also?" Yes but they are N/A without buying an entire tank/assembly. Occasionally you can find a "lightly" used assembly on E-Bay. Glad you found the solution to the problem.

 

Carl, "Is there a pressure regulator in the assembly also?" Yes but they are N/A without buying an entire tank/assembly. Occasionally you can find a "lightly" used assembly on E-Bay. Glad you found the solution to the problem.

When I get the assembly broken down I will see if It will match it up with something like Standard Motor Products PR210. If I get a match I'll post it.
Thanks again everyone for the help.

 

Check around the "lip" of the intake manifold itself, I found a small slice thru on mine that was throwing me fits on my 800..