Nytro MPI Code 15??? HELP!!!

[siltsleds]

I have a 2010 Nytro. Just finished installing an MPI SC and trying to get it dialed in. The sled was running good but a little rich and then started stumbling and flashing a code 15. I have disabled the TORS and understand that code 15 is the TPS. Can I just replace the TPS and big of a job is that? Or does anyone have any better ideas? Any help please.

 

[SpeeDWerX1000]

Just had the same issue this weekend on my Apex stage 3 MPI. I'm assuming you have a GEMS box?

Code 15 is typical when the TORS is disabled, it is posted on MPI's website too. I doubt anything is wrong with your TPS sensor.

If the sled is burbling/no response down low--it's probably getting too much fuel. Mine was good last weekend when it was way colder out, this weekend it was 30 degrees and was running very rich.

I adjusted my Boost/Fuel on my GEMS box down and it cleaned up the bottom end right away.

 

[shawnmcgr]

On the Apex, 84 is TORS and 15 is one of the pressure sensors (manifold I believe). I get 15 and 84 every time I fire up. They should disappear shorty after you fire up. The GEMS box modifies the manifold pressure signal and it reads very low until your GEMS initiates. This triggers the code 15 (on the Apex at least). If you go into diagnostics you can see the manifold pressure reading and the atmospheric pressure reading. Without the GEMS plugged in they should read the same, if you crank the motor the manifold will drop off. With the GEMS plugged in the manifold will read way low.

That's for the Apex...I think the codes are the same for the Nytro.

 

[siltsleds]

Mine once the code 15 starts flashing the sled starts sputtering to the point that it won't run. When I restart it idles below 1000 rpm and if you touch the throttle it dies. If you wait about 5 minutes you can fire up and ride about 5 minutes and it does it again. Maybe I am running way to rich? I am running a GEMS box with the settings that I got from Tom Hartmen. He said he rides between 6000' and 8000' and I ride between 8000' and 10,000'. I do not have any gauges other than boost. No A/F gauge. Did not want to have to spend the $. (which seems to be really paying off for me know) But do you think I can get this thing dialed in without it? (without burning it down)

 

[shawnmcgr]

You can confirm the codes here, I cannot see them @ work.

http://www.ty4stroke.com/viewtopic.php?t=58910

I thought the code 15 was causing my idle issues as well but I know think it is the IAC (Idle Adjust Circuit). I tried clearing the code 15 like 5 times and as soon as I plugged in the GEMS box it would spit out a code 15 again. I then went into diagnostics and realized the manifold pressure signal is modified by the GEMS box (this is part of what mode 6 does, red/blue setting). I don't think the GEMS box modifies this signal until it initializes, so the ECM sees the low manifold pressure signal at initial fire up (while the GEMS box is doing the Kit Knight Car 2000 impersonation) which causes the code 15. Once the box initializes then the manifold pressure signal is modified and everything is good (unless you have this setting too high in GEMS then it will spit a code 14, if I remember right, atm sensor out of spec, it then defaults to 85kPa).

I'd definitely get a A/F gauge to fine tune your settings. I'd be willing to bet your running way rich at idle. This is my problem, I'm seeing A/F of 10! You could try leaning out the green setting but I wouldn't recommend without an A/F....these motors are way $$ to re-build or replace.

If I get my idle issue resolved I'll let you know what it was.

 

[yooper1]

Spend some money now on a A/F mix gage, or starte saving for a new motor. Not being a jerk, you have no idea what the motor is doing.

Years ago I was racing my Dodge Turbo Diesel and my boost gage went to 40 psi and I installed water/meth and I would always peg the gage at 40 not know how much boost I was truly running. On the , 3rd day doing this bam, head gasket ($1000.00) big learning curve trying to save money. Just my .02 good luck but you really have no idea and the one thing I have truly learned is no two settings are the same.

 

[SpeeDWerX1000]

You need a air fuel--spend the money for a prologger IMO. You can play back every run and see what your sled is doing.

You are running wayyy rich probably and don't even know it. You will have a very difficult time getting your sled to run right without an A/F gauge.

Mine was at 9:1 AF in 30 degree weather, when it was 10 degrees it was 11.8:1. The result was horrible bottom end throttle response. It's an easy fix with an AF gauge and a few adjustments--I figured my problem out and had it running perfect again in about 2 minutes.

 

[shawnmcgr]

Nevermind what I said about code 15, I checked last night and 15 is TPS. Which I think mine is hooped, maybe causing my poor idling. I believe it's code 13&14 that are the pressure sensors - which I've tripped by adjusting by altitude setting in my GEMS box too high.

My TPS reads 37 at fully closed so I'm going to try adjusting or replacing it. The MPI install says 85&15 are normal but I thinkg that's just related to the chopping the throttle and boost holding the throttle bodies open. Definitely not the case with mine.

Anyways, yup A/F gauge is money well spent.

 

[Boneless]

Has any one got closure on this? I've got a non boosted sled doing the same thing. I was getting the TORS code so I over ran that, now sporadically I get a code 15. Comes and goes. I seem to be able to ride it, though once in a parking lot it kept popping up and shutting down the machine. But at home it was gone and ran fine. My TPS jumps all over when it's freaking out, like 6 and 50 but then will jump back to 16 and 92. I've check all the wires for shorts and greased everything but it keeps on happening. Anyone actually replaced their TPS? I called my shop and they've never replaced a TPS on a sled newer then 2008.