P500 Rough idle

[CowboyMatt]

Hi all. New to the forum. I have checked the other chats and don't see a lot of information, so I am starting a new thread in hopes of a discovery. My 2016 500 has developed a rough idle. While in neutral, it lopes. While in gear -if it's at an idle- it's a real rodeo. When I apply throttle, it runs perfectly. It was running when it happened. I was standing right next to it. A buddy was sitting in it, and it just started loping. I drained and changed the gas; twice. I've run fuel additives through it. No change. I changed the oil. No change. I just ordered a shop/service repair manual, but I don't know where to start on a fuel injected engine. I'm assuming it has to do with the idle air control valve, but I don't know for sure. If anybody has seen this, and knows what to do, or at least where to start, I would really appreciate some help!

 

[Admin]

 

[NTCPrezJB]

I'm interested to see what ideas people give you on this.

My initial guess would be a dirty airflow sensor (if our P500's have them), but I make no claims of being a mechanic either.

 

[trigger]

Fouled plug maybe? I've had snowmobiles do that before, run fine when you're on the throttle but start and idle hard.

 

[Chooglin]

Do you run in deep water and mudd ?

I would start with the simple stuff first , spark plug , clean air filter , check air box drain......etc. also clean the spark arrester per manual!

 

[CowboyMatt]

Fouled plug maybe? I've had snowmobiles do that before, run fine when you're on the throttle but start and idle hard.

Thank you. I did check the plug. It was a little fouled, but not bad. I cleaned and replaced. That actually made the lope worse. No idea why.

 

[CowboyMatt]

Do you run in deep water and mudd ?

I would start with the simple stuff first , spark plug , clean air filter , check air box drain......etc. also clean the spark arrester per manual!

Thank you. I checked everything but the air box drain. (Didn't know there was one?? I assume it's going to be obvious, and below the air filter?) Cleaned the spark arrest port too. No change. This machine is acting like it's starving for fuel. But as far as I can tell, the only fuel filter is inside the tank, and is not supposed to be serviced. I would like to see if there is anything I'm missing before I go through the serious hassle of removing the fuel tank, then the fuel pump, etc.

 

[DG Rider]

Fuel pump is actually fairly accessable on the 500 once you pull the seat plastic on the passenger side. You don't have to remove the tank.

Have you tried cracking the gas cap while running to see if it clears up (venting issue)?
Check for vacuum leaks in the intake.
Idle air control valve (IACV) is a possibility. Wiring to various sensors should set a code, but check anyway. And while you're at it, check the battery cables for tightness along with grounds, etc. Might even disconnect them for a few to see if it fixes it.

 

[Chooglin]

Thank you. I checked everything but the air box drain. (Didn't know there was one?? I assume it's going to be obvious, and below the air filter?) Cleaned the spark arrest port too. No change. This machine is acting like it's starving for fuel. But as far as I can tell, the only fuel filter is inside the tank, and is not supposed to be serviced. I would like to see if there is anything I'm missing before I go through the serious hassle of removing the fuel tank, then the fuel pump, etc.

Air box drain really wouldn't affect how it runs , just thought I would mention it ! I would check for any bare wire in the harness , ground wires anything you can think of , it could also be a faulty coil !

It could be a number of things , but I would do as you are doing , just check everything that is suggested , before letting the dealer get there paws on it !

 

[Bastardchild]

Dirty idle air valve on the throttle body or bad connection where the wires plug into it? No idea really lol. Good luck! Let us know what you find out!

 

[lee]

Dirty IACV
Go here:

P700 - P700 IACV Removal/Replacement - High Idle Issues!

 

[HUCK]

If you just want to sit in it idling try your recliner , then when you want to ride it ....G O another dilemma solved . Your welcome

 

[Arizona]

Thank you. I did check the plug. It was a little fouled, but not bad. I cleaned and replaced. That actually made the lope worse. No idea why.

On my Suzuki DR200 dual sport bike, I had rough idle problems, also cleaned & replaced plug, it didn't help. Then I installed a brand new spark plug and it has run perfect ever since. Try a new spark plug if other things aren't working.

 

[DG Rider]

If you just want to sit in it idling try your recliner , then when you want to ride it ....G O another dilemma solved . Your welcome

Arizona state of mind...

 

[CowboyMatt]

Dirty IACV
Go here:

P700 - P700 IACV Removal/Replacement - High Idle Issues!

Thank you. That was, in fact, the problem! I removed it and found it to be very, very dirty. Don't know why. Air filter itself was a little dirty, but not bad by any means. Anyway, I pulled it, cleaned it with carb cleaner, and reinstalled it. Presto! Problem solved. Thank you for your help.

 

[CowboyMatt]

Hi all. New to the forum. I have checked the other chats and don't see a lot of information, so I am starting a new thread in hopes of a discovery. My 2016 500 has developed a rough idle. While in neutral, it lopes. While in gear -if it's at an idle- it's a real rodeo. When I apply throttle, it runs perfectly. It was running when it happened. I was standing right next to it. A buddy was sitting in it, and it just started loping. I drained and changed the gas; twice. I've run fuel additives through it. No change. I changed the oil. No change. I just ordered a shop/service repair manual, but I don't know where to start on a fuel injected engine. I'm assuming it has to do with the idle air control valve, but I don't know for sure. If anybody has seen this, and knows what to do, or at least where to start, I would really appreciate some help!

Replying to myself here. It turned out to be a dirty IACV. I pulled it, cleaned it, and put it back in. Problem solved.

 

[BigHornRider7691]

Thank you. That was, in fact, the problem! I removed it and found it to be very, very dirty. Don't know why. Air filter itself was a little dirty, but not bad by any means. Anyway, I pulled it, cleaned it with carb cleaner, and reinstalled it. Presto! Problem solved. Thank you for your help.

Where is this valve located?

 

[BigHornRider7691]

I pulled and replaced mine. Still no change : (