TPS Setting Issue

[tdorval]

I know there has been a lot of talk lately about the TPS, and I have a related issue. First off, my sled (new to me this season, 2011 ProRMK 800) was dieing out at idle on a frequent basis. The idle was not steady, it would wander +/- 250 rpms. This "wandering" rpm could also be felt at slow steady cruising speeds. With the throttle held steady the rpms will wander +/- 250 rpms. Reverse worked most of the time but it would die once in a while when using reverse.

I thought from this that checking the tps would be a good start to checking into my issues. So I made a tester and got to it. I went ahead and sent the base setting to .71v and the idle setting to .94v. (I'm using a fluke meter so the meter isn't a cheapo). I plugged the tps back in and bam she was idling perfect, steady with very little "wandering". Sled did not die at idle. I thought my problem was fixed until I gave it some throttle and the sled bogged and died. I started it back up, and noticed my check engine light was now on, apply throttle again, sled bogs. I then checked that my tps was good with an analog meter, no dead spots. The only thing I haven't checked was that the tps is getting 5v at idle, I will try and check that tomorrow. I proceeded to play around with the tps to see where I could set it so the sled would rev normal and for the check engine light to go out. For normal function my tps had to be set at a base setting of around .95v, idle was at 1.1v-1.15v. With these settings the throttle response was there, but the idle was back to what it was before adjusting the tps. (these numbers are close to where they were prior to me adjusting anything, I did not write down my numbers before doing anything but they were close to what these are.)

So with all that said does anyone have any ideas as to what could be going wrong here? My tester although not perfect is putting out 4.98v, I've tried 4 voltage regulators and 2 batteries and thats the closest to 4.99-5.01v that I can get (out of VR at radio shack now).

Thanks in advance and Merry Christmas!

 

[AKSNOWRIDER]

can you count the flashes on the check engine light and see what code it shows..that would help to isolate the issue...

 

[tdorval]

The light was just solid. If I applied full throttle momentarily the motor would bog and the light would go out for a second then come back on solid again.

 

[tdorval]

I should add, when I said it would bog out, it would bog out and die if I stayed on the throttle. Short shots of full throttle would bog and if I let off it would return to idle. It was not even runable with the recommended settings, but the idle was perfect.

 

[AKSNOWRIDER]

check the reference voltage..make sure its good and maybe check fuel pressur...wonder if the filter is plugged or pump is weak?

 

[tdorval]

I thought of the fuel pressure, but would that make sense since it was working fine before? (aside from the idle/ low rpm issues). Also, the bog goes away with the settings I posted. I will check the reference voltage tomorrow and go from there.

Thanks again!

 

[TurboMatt]

I had similar(but not exactly) issues with mine. I set base to .710, when I set the idle to .930 my sled would idle at 3000 rpm's. I manually adjusted the idle down to 1800-1900rpms which is a idle voltage of about .800v, its been running fine for the limited bit I have driven and run it so far. We'll see for sure next week when we head to the mountains, but no bogs or hesitations on the track stand or the couple of passes I made up the farm field.Reverse is working perfect too. When I originally checked how it was set from the factory it was at a .850 base voltage and .965 idle. I've talked to a couple people about this lately because I was having problems and most say its not nearly as important to get it as perfect as some make it out to be or some even told me that they adjusted the idle manually a touch one way or the other to get it perfect and have noticed no ill affects.

 

[tinkerjohnson]

tps

my 2011 is having the same problem now aswell i reset the tps which was not off by much it was .710 base and 9.20 idle and i moved it too .700 and and .930 idle, was ok but a little high 2200 and would low down to 1850 but on the trail it had a dead spot at low throttle possition and would surge and bobble there so i came home and reset it back and now it wont even idle it just dies and now only runs on one cylinder i pulled the plugs and they are black, its been running rich ever since a messed with it so i would say if your sled runs ok dont play with it, mine wont run for **** now i used a polaris tps tool and fluke meter to set it

 

[AKSNOWRIDER]

my 2011 is having the same problem now aswell i reset the tps which was not off by much it was .710 base and 9.20 idle and i moved it too .700 and and .930 idle, was ok but a little high 2200 and would low down to 1850 but on the trail it had a dead spot at low throttle possition and would surge and bobble there so i came home and reset it back and now it wont even idle it just dies and now only runs on one cylinder i pulled the plugs and they are black, its been running rich ever since a messed with it so i would say if your sled runs ok dont play with it, mine wont run for **** now i used a polaris tps tool and fluke meter to set it

sounds like yours has moisture in it..buddies was fine when we left the lot yesterday, after about an hour in pretty deep snow his was running real irratic.. when he got home last night he found moisture in the connector...

 

[sled-fiend]

I had a similar issue with mine, plugged it in and got 2 TPS codes P1552 and P0120. The boot on the tps had partially and come off and gotten wet, second the throttle cable had too much slack.

 

[tdorval]

I just checked reference voltage at idle. It was between 5.12-5.13v. This seems quite high. I'm just going to adjust the tps so I can at least ride the thing and go from there for now.

Is there a way to check the fuel pressure with out the polaris parts in the service manual? I haven't even looked into checking fuel pressure yet.

 

[Boston Racing]

I have noticed that after people "fix" the TPS they seem to have more problems. I am one of those that doesn't think it is near as sensitive and most others. I checked mine. It was out of spec and my sled runs flawless.....I left it alone.

 

[Boston Racing]

I just checked reference voltage at idle. It was between 5.12-5.13v. This seems quite high. I'm just going to adjust the tps so I can at least ride the thing and go from there for now.

Is there a way to check the fuel pressure with out the polaris parts in the service manual? I haven't even looked into checking fuel pressure yet.

Rig up a loop from one side of the pump to the other with a gauge in between. Apply 12 volts to the pump harness and see what it puts out.

 

[tdorval]

If my sled was running flawless I wouldn't have messed with it. I was trying to fix my idle(sled would die at idle) / low speed cruising rpm fluctuations. I was wanting to get everything smoothed out before the turbo install is all. She should be in on Mon, or Tues BTW (PUMPED!).

If I get motivated I will check the fuel pressure Tuesday. But doesn't a reference voltage at idle of 5.12-5.13 seem quite high? I remember someone saying theres was 5.08 and they were considering putting a new ecm in the thing.

 

[Boston Racing]

Reference voltage and measuring voltage in general can be tricky when dealing in tenths of a volt or hundredth's. Cheaper Voltmeters may not be accurate enough to rely on.

You have to admit...The folk that mess with them seem to have more problems in the long run. Maybe a trip to the dealer is in order to check it with digital wrench. Shouldn't cost much at all, plus you will know if there is any other codes that could indicate a problem.

 

[tdorval]

At the moment I'm waiting for some warranty stuff to go through, if it comes through soon I will bring it in. The meter should not be at fault, its a fluke meter. I may call the dealer tomorrow to see how much it would be though and go from there.

From what I've seen I will agree with the messing with them creating more problems in the long run, in this case I'm still in the same boat as I have my sled back to square one, idle not perfect but running ok everywhere else. Just seems odd that when put to factory specs these issues would arise. Well I'm going to go take an afternoon ride I think!