2008 m6

Mike270412

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Sled ran fine all weekend in deep powder. Got stuck yesterday,rolled it out. Hasn't run since. Pretty sure its a fuel /electrical issue. We fawked around for at least an hour before towing it out. It has spark.We dumped fuel in it and it ran (really rough) for maybe 30 seconds.Now that it's home in garage ,thawed out, it will fire but not stay running.
 

Mike270412

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By the way. My 16 m8 has almost 2000km including towing an m6 out of Morning Glory and is still on original belt.
 

Mike270412

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We can get it running but it wants to go full throttle. Tps maybe?
 

Lund

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We can get it running but it wants to go full throttle. Tps maybe?

Hahaha, it want to go ride man...

Interesting, have you pulled the air box and looked to see if the throttle plates are open or did you have a look at the throttle linkage to see if it is stuck open.
If it goes "full throttle " like you said the throttle plate are open, have a look.

Malfunctioning TPS, the engine will either just idle or will not start. If you try to rev it up from idle, it will just die.
 
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Lund

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We can get it running but it wants to go full throttle. Tps maybe?

When you say "we can get it to run" it sounds like its an effort to do so.
It tell's me that it doesn't start very well and your forcing the start, is that correct??
 

Lund

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Sled ran fine all weekend in deep powder. Got stuck yesterday,rolled it out. Hasn't run since. Pretty sure its a fuel /electrical issue. We fawked around for at least an hour before towing it out. It has spark.We dumped fuel in it and it ran (really rough) for maybe 30 seconds.Now that it's home in garage ,thawed out, it will fire but not stay running.

On this post, it ran great till it was rolled over then no more go.
Unless you force run it by dumping fuel in it.

Did you check the fuel for water contamination. Water in sled fuel tanks is very common through condensation. When you rolled the sled the pumped might had gotten a gulp of water in the inlet. At that point the pump will not build pressure to the fuel rail, thus no fuel or very little fuel to the injectors.
I would not hesitate to dump the fuel and put some fresh stuff with some fuel alcohol. I treat my fuel tanks every 4-5 fills with Isoheat.
 

medler

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Fuel cap maybe if you rolled it over. Maybe some snow in the electrical connections under the hood. Worst case Ontario a trip to see Terry
 

Mike270412

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With every pull it will "fire" but not run. After 5 or 6 it will backfire, then the 7th or 8th pull it will run but only at extremely high rpm.Thought the same thing about throttle plates but got they look and function fine. As soon as you close the tss it rev. Weird...
When you say "we can get it to run" it sounds like its an effort to do so.
It tell's me that it doesn't start very well and your forcing the start, is that correct??
 

Lund

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With every pull it will "fire" but not run. After 5 or 6 it will backfire, then the 7th or 8th pull it will run but only at extremely high rpm.Thought the same thing about throttle plates but got they look and function fine. As soon as you close the tss it rev. Weird...

So you are getting fuel, the back firing is the give away. Then when it does fire up it runs fast(high rpms) its actually burning off excessive fuel build up. hhhmm..thinking

So if you let it run fast for 30sec. will it settle down or die off ?
 

Mike270412

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So you are getting fuel, the back firing is the give away. Then when it does fire up it runs fast(high rpms) its actually burning off excessive fuel build up. hhhmm..thinking

So if you let it run fast for 30sec. will it settle down or die off ?
It dies. Can't keep it running.
 

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Ok, so we are on the same page TSS (throttle safety switch)

You have 2 of these switches, one at the flipper and one at the throttle body. They need to work together, you might had gotten snow(water) in the flipper switch from rolling.
These switches will actually retard the timing till the motor just shuts down if they don't work properly. You can actually pull the flipper assembly apart and clean that switch with WD40.
 

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Ok, so we are on the same page TSS (throttle safety switch)

You have 2 of these switches, one at the flipper and one at the throttle body. They need to work together, you might had gotten snow(water) in the flipper switch from rolling.
These switches will actually retard the timing till the motor just shuts down if they don't work properly. You can actually pull the flipper assembly apart and clean that switch with WD40.

I'm thinking now that not the problem because of your last post, but it doesn't hurt to check it.
 

Mike270412

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I've had TSS freeze. Sled will idle but die as soon as throttle opens.
 

Lund

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Your pretty confident on the fuel being ok ?
An injector obstructed by water will do funky things. Like instead of vaporizing the fuel in an even spray it can cause it to just drip or gush.
 

Mike270412

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That's a possibility,but it ran for a couple hours prior to quitting,so, unlikely in my opinion. Fuel pickups are on bottom of tank so any water should be the first thing to go through.I would think a water issue would show up earlier. Also,there were 5 sleds in the trailer that all got fueled at the same time and only one with issues.
Your pretty confident on the fuel being ok ?
An injector obstructed by water will do funky things. Like instead of vaporizing the fuel in an even spray it can cause it to just drip or gush.
 
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