m7 wont start on the hill????

[mtn mike on boost]

gave my wife's sled a good once over this last week, ran great in the garage and on the track stand.loaded up the night before, got gas on the way up the next morning, and once at the snow park......SHE WONT START.

pulled and pulled, eventually tried some starting fluid in the air box ( fired right up) and as soon as i hit the throttle, she died.if i pull it over enough times, it will start and idle ( real low like 200 rpm ) then die. will do this over and over and as soon as i crack the throttle, she dies.

the sled is an efi and is getting fuel to the fuel rail. smart valves in the tank seem to be working, plugs are neither wet or dry, looked normal.what gives???
runs fine until i get up to the mountains then nothing???and no, now that i am back it still doesn't run.by the way the stock kill switch has been disconnected for a few years now, so that's not it.

i am thinking a bad injector(s), stator, ????

any ides or where to start????thanks....mm

 

[89sandman]

have you tried disconnecting the t.o.r.s???

 

[BacknBlack]

Did you get some bad gas on the way up?

 

[m7bandit]

off hand it does sound like a fuel problem the way it starts and dies thats where i'd start has it been sitting all year maybe bad gas not sure what you mean about plugs neither wet or dry but should be one or the other. i'd change to fresh fuel, maybe pressure or pluged fuel lines

 

[Dano702]

Did you fill the tank before you stored it for the summer? This makes me think fuel pump. I guess this is a stocker so you might not have a fuel pressure gauge.

My guess is a sticky pump .

 

[mtn mike on boost]

have you tried disconnecting the t.o.r.s???

are you referring to the hook up on the throttle bodies?if so, no i haven't tried disconnecting this. will the sled start w/ this disconnected?i have the tps? one disconnected from the throttle block, it has been like this for a while.
i doubt i got bad fuel, because there was the existing fuel already in the fuel line so i never got to the fuel i had just put in the tank, plus i put the same in my sled, and went for a short ride and all was fine.

as for bad fuel in the tank...... who knows?i usually have the sled full to the tank neck for the off season, but this time i knew i was turning this into my wife's sled, and taking off the turbo kit i had on it, as well as putting the stock oil pump back on, ( i had the bdx delete on for me) so i only had 1-2" race gas- oil mix left in the tank. started and ran fine with this prior to taking the sled up.

 

[troff18]

i would say it would be the stator... my sled did the same thing last year

 

[mtn mike on boost]

i would say it would be the stator... my sled did the same thing last year

if i wanted to check and see if the power to the injectors wasn't adequate
( like a bad stator ), could i try using a 9v battery to ea injector, and try and start? not sure if the injectors receive constant power while running or just pulses to fire the injectors?

 

[Sledbrain2]

When my tps acted up I could not get it to start unless I would put power to the injectors with a battery. It would run with a bad miss. Problem is that you have to bring it to a dealer to check the tps. The stator could also cause similar symptom's and AC's are know to have them go bad in the 1500 mile mark and higher. Mine was an 02 efi with 2200 miles when the tps went out. Good luck

 

[mtn mike on boost]

if i wanted to check and see if the power to the injectors wasn't adequate
( like a bad stator ), could i try using a 9v battery to ea injector, and try and start? not sure if the injectors receive constant power while running or just pulses to fire the injectors?

today i ;
verified sled had same condition
pulled connectors off the injectors and put a 9v battery to ea one to see if it was firing.....they both did.
pulled fuel line off the fuel rail and directed back to the tank.
then i took a 9v battery directly to the fuel pump.....nothing
so i took a 12v battery to the fuel pump.....worked like a charm, hooked up to the fuel rail.... sled ran great
then i disconnected the aux 12v and let the sled run out of fuel
i reconnected to the sled power supply, and after a few pulls it started and died. i pulled a few more and it started, idled real low like it was going to die, then picked up rpm and ran fine.
so i am guessing its the power supply from the stator......
i would check w/ my meter while pulling the sled over, but i am the only one here.any other way to confirm if the stator is bad?

 

[minytallpines]

mine did the same thing, took it to dealer and ended up replacing the wiring harness under warrentee

 

[89sandman]

i'd try the tors, also check the wiring to your injectors real close and see if they have rubbed or melted a bare spot. if they ground you will have intermitten troubles. my buddies M1000 wouldn't start one day after we had lunch, would start blubber and die, then sometimes would not start at all, ended up being one of the injector wires had rubbed a bare spot under the fuel rail.

 

[bigrodney]

stator repair

You can send the stator to "RM stator" and they will check and repair. Quick turn around from them.

New stator will run you over $500.00 mine was 150.00 to repair.

 

[Sledbrain2]

You should be able to run it while probing with a multi meter, should be 12 to 14 volts

 

[mtn mike on boost]

You should be able to run it while probing with a multi meter, should be 12 to 14 volts

the fuel pump gets enough power to run when the sled is already running. the problem seems to be getting enough power to the pump while pulling the recoil....mm

like putting bigger fuel pumps in for turbo m7's. they pretty much all had this problem.

 

[christian]

Can't you ohm the stator in place to determine if its bad?

Thats what I did with my ducati (polaris) conversion from 1200psi in my old BB KK motor. He gave me numbers and his spec numbers nailed it. So in a couple minutes it confirmed the stator was bad.

Im sure RM stator have the numbers and dont see why they wouldnt give them to you? Be $hitty to pull it and find it not to be faulty!!!

 

[1MEX]

mine did the same thing, took it to dealer and ended up replacing the wiring harness under warrentee

X2. New harness for me too.

 

[mtn mike on boost]

thanks for all the help...
ended up being the fuel pump