Turbos not starting after taking a break?

you havent been around here long,

The no start issue is due to heat, if you shut them off hot the coolant in the engine peaks and the temp sensor reads it as to hot and leans it out, kinda a limp mode type of thing. Most turbos install a temp switch that disconnects the temp sensor. So you can shut off the temp sensor and pull it over a few times then turn it back on and away you go, by breaking the connection to the sensor the ecu makes it rich, like a choke.

If that doesn't do it, try this. Turn the kill switch to the not run position, then hold the throttle wot and pull it over three times, then turn it to the run position with not throttle and give it a pull.

If you don't have a switch to shut off the temp sensor you can have someone blow on the barometer tube, it makes the ecu think the barometric pressure is higher and gives it more fuel. But if you try this make sure you get a pick of your buddy giving your sled a blow job.

From what I have been told by OVS and experienced the cats have a high altitude map that kicks in at 8500 feet. It adavances the timing and leans out the fuel map a ton. I have verified this with my O2 guage and then plugged the barometric sensor and ran the sled. When you reach 8500 ft the idle goes lean and so do my wot readings. With a plug installed in the barometric sensor line at 7000 ft I ran rich for the first time as I climbed above 8500 ft. Was nice to finally figure out the reason for the lean reading I have been seeing since installing my turbo kit. Everyone kept telling me engine overtemp was causing my no start, I have an oversized cooler and I am sure I never saw an overtemp condition. I would have to pour fuel in my air box to get the engine to fire at high altitudes. I had read a post on here about someone blowing on the tube going to the ECU while you pull the rope. After seeing this first hand I am sure that trick would work. It tells the ECU you are at a lower altitude and puts more fuel in the engine so it will start back up.

From what I've seen is when your riding and you come to a stop the sled is at a high idle or idling a little higher then normal. If you kill the sled while its doing it the sled wont start 80%of the time. Its like its trying to stay in that high idle mode (leaning it out i would guess) and wont give the sled enough fuel to start the motor. So you either have to pore a little fuel in the spark plug holes or trick the system into giving it more fuel. Now if you wait for the sled to idle down back to normal before killing the engine it should start back up. Why would it do this on a turbo sled but not a stock sled i think it would be because of the turbo compressor pushing to much or not enough air in the motor when your pulling it over. So just let it idle a while and your GTG.

I agree, If I let mine idle down it will start every time. These new fuel injected motors run so lean if you don't let them sit a minute and richen back up on the bottom end they are so lean on start up they will not start. I increased my fuel pressure 2 psi and that seemed to help a ton. I still let it idle down and shut it off. It also lets the turbo spool down as well.

I've had it happen on my piped 07 m1000 a few times. Never heard of the 8500ft lean tuning, and my sled doesn't seem to be effected by it.

i have seen this symptom down at 3-6000 feet aswell hot start switches were installed tieing into the coolant temp sensor to remedy this as well