'08 M1000 Bog and other stuff - For reference (no luck yet on bog)

Just thought I'd chime in here to let those of us still trying to fix our bog what I have done so far. None of which has worked. I included a few other things just FYI if anyone is searching around.

Sled is bone stock '08 M1000 Sno Pro 153
Elevation is 0-5000 feet
Fuel is Plain Jane 87 octane regular - non-oxygenated (cat claims this fuel is 4% richer than state side fuel)
Location - South Central Alaska

This machine runs great on the top end (subjective) but the clutches get hot and IMO it doesn't back shift like it should. Belt life is approximately 300 miles of hard riding (060 belt). The bog comes in at about 4000 RPM + or - 200 rpm. If I hold the throttle in a position that allows the sled to slow down and stop, the engine will flat out die. Every time. (I've only tried this when the engine was warm) Others with the bog should try this test and report back if their bogger does the same please.

Changes in 07/08 Season
Installed SLP can - saved 8 lbs. No effect on bog
Sealed around exhaust to belly pan fit - no effect on bog
Installed BDX air intake - No effect on bog, really noisy. Removed BDX intake and sealed up all the holes I drilled in the belly pan. Installed skid plate.
Opened up stock air box inlet to 4" - No effect on bog
Installed BDX rear bumper kit and a generic LED tail light - no effect on bog (I have heard that on stock sleds that the power valves wont work if the factory tail light burns out)
Checked belt deflection - within factory spec
Changed belt deflection both ways - no effect on bog
Changed from 060 belt to 046 belt - no effect on bog, rpms increased, belt life went down.
Modified rear axle for 2 wheel "kit" - no problems so far (500 hard miles)
Installed boss high rise seat with shovel pouch - comfy, and an actual 8 lb loss, but seat is tearing at bottom edge where my boot rubs it.


Changes in 08/09 Season
Checked fuel pressure - 45 psi
Dropped fuel pressure to 42 psi - no effect on the bog, does seem to run better. Haven't had it in the mountains for a real test though. Definitely did not fix the bog.
Dropped the fuel pressure to 41 psi - no perceptible change
Re-routed barometric pressure tube from behind air box/low belly pan area to straight back along the side of the oil reservoir. - No effect on bog.
Checked oil injection ratio - Factory set at 39:1



A few search terms:
Bog, Bogging, Bogged, Died, dies, dying, Fuel, Pressure, Ratio,

Bullcamp said:

Wow, sounds like you've covered all the bases. I have an 08 M10 and don't have any bog (knock on wood). Can only imagine how frustrating it must be to have one that doesn't run right. Wish I had an answer for ya. I think I'd start with the fuel mapping. Ask your dealer to reflash to 09 if they can???
Could it be a clutching issue? I hate the way mine has no bottom end. After the 900 1M this things a dog. Looking at changing the gearing in it. Don't think I've been much help but good luck with it.:beer;

Click to expand...

I'm still holding out for the new updated fuel map I guess, but I dont have much hope. Cat can blame the EPA all they want but they should have done their homework before BEFORE releasing the product. I've always loved cat products and have supported them for a long time, but this may be my last cat product for a while.

I need to make one more trip to the mountains on the current setup, but after that Im going to gear down to M8 gears. Next on the list will be an A/F monitor and a boondocker box. Might as well go ahead and get an SLP Pipe at that point.

I forgot to mention that I swapped out the ECU with another from a brand new one off a sled just out of the crate. No positive effect, maybe even worse.

On 2009/1/30 I geared down to M8 gears. Sled feels more responsive and has better bottom end. No change as far as clutching goes. Still pulls the same RPM as before. No complaints, no major improvements either. Might like it better once we get in spring snow that has some traction. Can't say it was worth the 200 bones yet. Two mountain rides on these gears so far. no effect on the bog.

On 2009/1/31 my computer started throwing codes. An 07 and a 17. (07 is TPS and 17 is EGT) The sled didn't really run any worse than normal but I took it to the dealer anyway. The dealer and I swapped out the ECU again, still threw codes. I ended up finding an open circuit in the EGT wire so the dealer swapped it out and we fired up the sled. No codes. He soldered it up the open circuit so I could test ride it. That cleared both codes and the sled was back to "normal", but I couldn't make it die at will anymore. Before this I could make it die at will by letting off the throttle just enough that the sled would come to a stop. Good news!

2009/2/6 Before I left the dealer I purchased a D&D Barker adjustable can. Installed it in the low back pressure position.

2009/2/7 Sled ran good for a while but after an hour or so the sled started to feel like I was fouling plugs, so I increased the back pressure a bit. Plugs cleaned up and sled ran good. All in all the sled ran better than ever, but it still dies once in a while if I don't feather the throttle and it still bogs. My plugs are still dark brown so I'm going to adjust the fuel pressure down half a pound and play with the adjustable back pressure some more.

Today I searched for more broken wires or shorts to no avail. I added some more wire loom, used some hot glue, and added a bunch more zip ties in an effort to prevent more broken wires. I also re-installed my BDX intake as the D&D can is so loud the noise from the intake is a non-issue. Its ear plugs from here on out. I've sealed up all the holes I drilled last year, (for the intake) and installed a skid plate, so the intake will be taking in hot air. I may have to go back to the stock intake. With all the water crossings and water skipping we do, holes in the belly pan are not your friend.

BTW, the broken EGT wire was 100% a manufacturing assembly problem. The zip tie they used wore through the wiring. Check yours to make sure its not happening to you! It was the zip tie by the weather-pack connector on the egt wire, down below the coolant bottle. The zip tie needs to be up on the secondary rubber insulation, not down on the two little wires. Also you might want to cut the zip tie on the sensor itself and carefully take the big kink out of it, then zip tie it to the exhaust valve cables. My dealer reports that some customers sleds have had problems with the wires breaking at the "kink".

Per the above recommendation I lengthened the throttle cable today. Haven't taken the sled out yet, will report back if that helped.

2/10/09
I lengthened out the throttle cable last night. Sled still dies, hard to say on the bog as I have not ridden the sled in the mountains to really test it. I just rode the sled back and forth to work today.

Working on sealing the hood to tub fit to keep all the snow out of the engine compartment. Exhaust is already air tight where the can goes through the tub. Installed frog skinz vent covers on the 4 front hood vents. Im still getting snow between the hood and tub at the hinge.

Next step is to swap the egt wire from my wifes M8 and see if the sled still dies. After that I will test the plug wires, change plugs again, and some of the other sensors.

Anyone know what the stator output is, and/or have a procedure for checking it?

Nobody makes perfect sleds, even poo.

The true test of a company is whether they stand behind their product. Right now Cat is dropping the ball.

Back to the threads original topic.

I don't think I mentioned this before: The ECU on this sled is a Square.

I swapped the EGT from Mollys M8 tonight and went for a ride around the house. Bog might actually be worse than before, hard to say, but the sled still dies, maybe even more. Temps are about 20* higher than the other day. Hmmm... I wonder if the air box sensors are the same part number, I bet they are... Maybe I'll try that next. I'll take a look at the oil pump, or maybe just do the BDX oil injection delete.

I just checked the RV Sports website, the part numbers are the same.