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Discussion Starter #1
As post says sled wont run at any kind of load. 1/4 throttle seems to be fine but even at that position when it has a load put on it going up a slight hill it will die. If you put it to the bar it will run full power for about 10 feet then shut itself down like you hit the kill switch, keeping throttle pinned it will pick up and die then pick up and die. I had a code 21 but has since gone away. Also had a code 07 GPS sensor but only flashed once on cold start but never seen again. I have a code 17 for pipe sensor all the time and I know it's bad but sled has always ran without it every other time I've cooked the sensor. I have checked the following;

Boost still building 8lbs when sled is shutting down
Replaced spark plugs and gapped to .018"
Replaced all 4 plug wires and boots as they had wear marks
Tore sled down and checked reeds they're excellent
Compressin is perfect engine is only 1100 miles old
Back probed ECM harness to reed tips voltage .35v idle to 3.75v wot just like spec with no dropouts or glitches
Knock sensor appears to be in good shape and will code and clear by unplugging and plugging back in
Had half tank of gas so I dumped in a gallon of c16 and topped off with 91
Teed in fuel press gauge and taped to handlebars test rode has 46 psi idle to wot never drops
Idled sled while spraying brake clean on crank seals they seem good never revved up they were new 1200miles ago
Carb boots are excellent shape
Pistons are excellent shape


As I said the sled is a pumpgas set up with ebc from boondocker and has 4200 miles on it all boosted, 1200miles on rebuild. Sled ran great on a Saturday but I broke a helix and changed it that night then Sunday right off the truck it was a pos. has ran it's entire life on 91 octane fuel from the same gas station. Now it's been about a month since its ran good and I'm completely stumped, hoping there's a turbo builder or someone that has ran into this before!!! Please help!!!!
I did get it to actually go up a hill without bogging out by feathering the throttle as fast as fingers can possibly move the entire way up on hero snow. Sled will start and idle like its brand new. Problem doesn't show up until at altitude under load.

Thanks dan
 

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first off replace the pipe sensor if you knew it was bad it should have been replaced a long time ago. second check your throttle safety switch sounds like that may be the issue.
 

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Discussion Starter #3
Sled is fixed boost sensor for boondocker box was bad therefor not adding fuel under bigger boost and acting like it was starving. Pipe sensor I'm limp mode will only retard timing a few degrees that's all.

Thx anyway
 

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Sled is fixed boost sensor for boondocker box was bad therefor not adding fuel under bigger boost and acting like it was starving. Pipe sensor I'm limp mode will only retard timing a few degrees that's all.

Thx anyway
It will also mask the det sensor for some reason... I don't get WHY... but on boost it's important to clear the ECU 17 asap if you're pushing your octane levels.
 
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