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Thanks for the reply Lugbolt. I checked the pressure and flow, all looked good. I put a new filter on also. I sent the machine back to the owner.

I checked one last thing before throwing in the towel. I thought maybe the valve timing was off. I checked it and is was correct. It's a goofy way to check the timing on this thing. The crank pulley has an arrow that you line up with a mark on the case and a paint dot on the pulley that you line...

I got the new/used coolant sensor and once again it made no difference. I'm done. I let the owner know that I had failed. He said he'll have to take it to the dealer. He said he would let me know what they do to fix it. I will post what they do as long as he lets me know. To be continued......

Yes, I checked both according to the manual. The thing that I didn't do was take the coolant sensor out and heat it up in water to watch it change. It was at the approximate ohms for the room temp. I sure hope this is it. I'm ready to call it on this thing. It has become that thing to where its...

Ok, I'm back at it after letting it sit for a bit while I got caught up on the other machines in the shop. I thought that since one of the things the ECM relies on, is air pressure readings from sensors, I'd fix the exhaust leak. Well, it turned out that the manifold was broken and had a major...

papajoe Did you test pressure first or just change it? Mine tests good and has good flow. I put a new filter on it but it also made no change.

I'm not sure of anything at this point. The spray pattern looked good when I pulled it and sprayed on a piece of cardboard.

I received the ECM and there is no change. I was afraid that was going to be the case. Back to scratching my head.

Intake air sensor tested good also. I hate to buy the ECM because so many times its not it. I don't know where else to go though. I will post one way or the other. So many posts end without a conclusion and it drives me crazy!

Thanks Clutch, No lights come on, only when I unplug a sensor. I have the manual but missed the section on fuel injection control. I tried unhooking each sensor while it was running and every one made a change in the way it ran. I think I'm down to replacing the ECM. I found a good used one...

That's all for today. Thanks Clutch for giving me some things to try. I try to stay open minded but tunnel vision takes control way too often.

OEM sensor With the sensor unhooked it richens it up and it runs better, but it's too rich. With the air filter out and sensor hooked up, it runs worse, too lean. Intake clear as far as I can tell. The exhaust is leaking I think at the head connection. Its kind of buried and can't tell for sure...

Lash was off a bit, no change as expected.

All the wires check out, nothing grounded. The hose is not plugged or split. I just washed the engine off and when it cools down I'm going to check the valve lash.

Thanks Clutch, I'll check for that and report back.

Hi all, I have a 2011 RTV500 that I'm struggling to get figured out. It will start, run a bit, then stutter, then stall. It happens over and over until its warmed up. Then it will idle but falls on its face as soon as I give it throttle. I started by unplugging the hose on the Intake air...

Flcracker13 Did you ever get it figured out? I have close to the same issue.