Low idle, then die

[Tflynn]

In the past few months I have been having a problem. Occasionally after riding around for a bit when I let off the gas as I come to a stop the engine will start to idle low. Once I am stopped it idles very low (chug, chug, chug) and sometimes it dies. Other times it comes out of it and will idle normal again. When it dies, it starts back up fine and always runs good while on the throttle. If it doesn't die, it will run fine as I get going again but once I have to stop its the same thing again. Some days it won't do this at all and some days it does it a lot. Haven't noticed a relation between this problem and the driving conditions (heavy load, hot, cold,etc). I've got about 1200 miles on the machine. Any ideas on what the heck is going on? And how to fix it??

 

[ohanacreek]

Have you checked the spark arrestor screen? It may be clogged, some of the first production run models had an issue with the screen getting clogged, easy fix.

 

[Tflynn]

Well I don't think that's it as I have a yoshimura exhaust on it, but maybe that one can clog up too? Ill have to check. Thanks for your input Ohanacreek.

 

[scott]

Check the intake also. It sounds like something to do with air intake or exhaust. Something is choking the motor.


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[Hondasxs]

The IACV controls the idle. If it is stuck then the machine could run fast or slow.
Here is some info on it.

http://2faroffroad.com/atv-tech/trx680- ... peed-issue

 

[Lynn]

It could possibly be related to your gas. Poor quality fuel, not talking about octane but how much ethanol is in your fuel. I find when I can find Gas that has no Ethanol in it, my Pioneer runs much better and gets better gas mileage, and that goes for all my engines from cars to lawn mowers. I'm not a fan of Ethanol.

 

[Tflynn]

I wanted to bring this up again as I still occasionally have this problem and I believe I've found what condition is causing it but still don't know the solution.

The machine ALWAYS does this after it sits and idles for a prolonged period. For example, I drive to my pig pen, park, put in neutral with engine still running, feed pigs (3-5 minutes maybe?) hop back in my idling pioneer, put it in D, then chug chug chug die. If I leave key on and try to start it rarely will. If I turn key off then try to start, fires up and runs perfectly.

@Hondasxs , does that still sound like IACV? I figure it's got to be something electronically controlled that is reset when the key goes off.

Any help is appreciated. This is annoying but i won't go to the dealer. I feel there are FAR more competent people here that can help me fix this.

 

[Gator]

@Hondasxs , does that still sound like IACV? I figure it's got to be something electronically controlled that is reset when the key goes off.

I think you are right. It sounds like something controlling the idle. These things have an O2 sensor don't they? This sounds similar to an O2 sensor problem I had years ago. If that is the problem you could clean it and follow the instructions for replacing the battery (if there are any). The O2 sensor has to recalibrate after the battery has been disconnected on some vehicles.

I know where the idle adjustment is on all my 4 wheelers and I want to say turn the idle up. I guess that's old school now.

EDIT: A can of injector cleaner wouldn't hurt.

 

[Hondasxs]

The IACV controls the idle. Normally if it gets dirty or goes bad it causes high or low idle. With my experience it has stayed at that run level hot or cold.

Now. With every key turn this IAVC does spin and "reset". I guess it could change.

 

[ghost]

I wanted to bring this up again as I still occasionally have this problem and I believe I've found what condition is causing it but still don't know the solution.

The machine ALWAYS does this after it sits and idles for a prolonged period. For example, I drive to my pig pen, park, put in neutral with engine still running, feed pigs (3-5 minutes maybe?) hop back in my idling pioneer, put it in D, then chug chug chug die. If I leave key on and try to start it rarely will. If I turn key off then try to start, fires up and runs perfectly.

@Hondasxs , does that still sound like IACV? I figure it's got to be something electronically controlled that is reset when the key goes off.

Any help is appreciated. This is annoying but i won't go to the dealer. I feel there are FAR more competent people here that can help me fix this.

That website that hondasxs provided no longer works.
You might already have it but I found the service manual here.
http://gabe.dracula.seedboxes.cc/ga...700_Service_Manual_Repair_2014_Sxs700_Utv.pdf

It has troubleshooting guides.

Might want to check the electrical connections on the the IACV connector.

 

[Tflynn]

Thank you all for your input. No O2 sensor on mine (2014) so that ain't it. Thanks for the link @ghost, I've checked out the service manual already with no luck. Looks like I'll just have to try replacing the IACV, seems to be the most likely fix. Or just don't let it sit and idle!

Any idea where I can get one? I tried looking on RMATV but couldn't find it, but that doesn't mean it's not there.

 

[Hondasxs]

Can't find my pictures.
We have had luck cleaning it. You can make sure it spins good when you flip key to ON. But don't crank it. Careful. It could spin off.

 

[Gator]

What does IACV stand for?

 

[Hondasxs]

What does IACV stand for?

Idle Air Control Valve. It's located on the throttle body and works as replacement for an automatic choke. Or something like that.

 

[Gator]

Cool

Thanks!

 

[Eltobgi]

Ok I will give it a shot. Assuming no O2 issues as you have stated, clean air filter, spark plugs, and high quality gas is used..... I am going to put my money on low fuel pressure due to a weak fuel pump. This would explain why it dies at idle and is fine under acceleration. Also the pump repressurizes the system when switch is turned off and then on. What do you think? If I'm right PM me and I will give you my address to send payment, lol.

 

[Crow_Hunter]

Does it do it if you just apply throttle while in neutral without first shifting into drive or does it only do it if you first shift into drive and then apply throttle?

I don't know anything about it so I won't be able to help you on fixing it but I do root cause analysis for a living and the first thing I always do is try to eliminate as many variables as possible until I can get it to an on/off switch. Oft times when you use Occam's Razor you can find some really simple and sometimes completely out of left field reason for a failure that doesn't make sense when looked at in the whole but only when looked at in isolation.

 

[Tflynn]

Does it do it if you just apply throttle while in neutral without first shifting into drive or does it only do it if you first shift into drive and then apply throttle?

I don't know anything about it so I won't be able to help you on fixing it but I do root cause analysis for a living and the first thing I always do is try to eliminate as many variables as possible until I can get it to an on/off switch. Oft times when you use Occam's Razor you can find some really simple and sometimes completely out of left field reason for a failure that doesn't make sense when looked at in the whole but only when looked at in isolation.

Hey I appreciate any input so thanks! It does it as soon as it goes into gear. If I leave it parked in drive, I can get in and go fine but whenever I come to a stop it will happen again. Maybe I need to post a video.

 

[Hondasxs]

Found the old info I was looking for - TRX680FA/FGA High Idle Speed Issue | 2FarOffRoad.com

 

[Crow_Hunter]

Hey I appreciate any input so thanks! It does it as soon as it goes into gear. If I leave it parked in drive, I can get in and go fine but whenever I come to a stop it will happen again. Maybe I need to post a video.

If I am understanding what you are saying correctly, it sounds like it is tied to the act of shifting.

So if you drive it, get it hot, stop, leave it in drive and apply the parking brake, leave it running, come back, release the brake, and accelerate with no ill effect?

If you do all the same stuff but switch it to park instead of using the parking brake, it will cut out?

If that is correct, what change in the system happens when the unit has park applied that doesn't happen when just the parking brake is applied?

That would be what I would be looking at.

Again, if I understood what you said.

That is about all the help I can be though, I don't have a 700 to experiment on and only rudimentary knowledge of its systems.

Hope that helps some anyway.

ETA: I just looked up a picture of the P700, it doesn't have a park. I just demonstrated my rudimentary knowledge. Doh. But maybe it will spark further inquiry so I won't delete my ignorance.