ANOTHER 900 ISSUE!!

[ALPINE SPORTS]

HI
NEW TO THIS FORUM, USUALLY ON AMSNOW.
ANYWAY, HAVE AN 05 FUSION REBUILT LAST FALL AND RAN ALL WINTER. NO MAJOR ISSUES UNTIL THE LAST RIDE. STARTED RUNNING FINE , THEN I NOTICED A "LITTLE" LOSS OF POWER, THEN MORE AND MORE AND MORE TILL IF WAS LIKE RUNNING ON ONE CYLINDER. MAG PLUG WAS DRY, PTO WAS WET, CHANGED PLUGS STILL RAN AWEFUL. THEN CHANGED THE FUEL FILTER-OLD ONE DEFINITELY CLOGGED-A LOT HARDER TO BLOW THRU THAN THE NEW ONE I PUT ON. MAYBE IT HELPED A LITTLE, BUT STILL RUNNIN BAD. COULD A CLOGGED FILTER HURT THE FUEL PUMP? IF SO HOW CAN ONE TEST IT? IS IT POSSIBLE SOME FILTER MATERIAL HAS CLOGGED THE INJECTORS?? COMPRESSION IS GOOD AND PISTONS AND CYLINDERS LOOK GOOD-I DONT KNOW WHERE TO START?
THANKS
PHIL

 

[Danbot]

I think some of the hose or plastic line in the fuel tank is known to come apart, although I have no experience with this myself. Hopefully someone who has dealt with this will comment.
Sounds like fuel is where you want to start looking. Check fuel pressure on the rail, the 05 manual claims regulated pressure to be 58psi(4bar)
Good luck, let us know what you find.
Dan

 

[ALPINE SPORTS]

HOW EXACTLY WOULD YOU CK THE FUEL PRESSURE??

IN ADDITION I DO SEE SOME OIL ON THE CRANK SEAL ON THE PTO SIDE, AND NOT COMING FROM THE OIL LINE ABOVE IT.

 

[Danbot]

To check fuel pressure, you will need a fuel pressure tester / gauge. Hook it up to the fuel rail at the valve, then connect 12v power to the pump (search for the thread in the stickies on "priming your fuel pump").
If you don't have access to a tester, or know how to use one... you may want to seek some help from a local who can assist you.

 

[ALPINE SPORTS]

ok
did it, the guage went to 60psi,then unhooked power source and the guage dropped slightly to about 52-54-normal??

 

[BIGGDAWG]

y that is normal

 

[mountainhorse]

Dude... turn off the Cap's lock on your keyboard.

 

[sleddude]

On the 05 900's the fuel tank float was known for deteriorating inside the tank and clogging things with black rubber particals. I think it was a recall item that should have been replaced. If you didn't drain your tank before you installed your new filter it might be plugged now as well. I'd drain the tank and see how the float looks and check for black particals floating in the fuel first.

 

[mountainhorse]

A clogged filter would not, IMO, hurt the fuel pump..

I think sled dude is on the right track... also, your injectors could be dirty and not flowing.

What is the compression mag and PTO?

One side wet and the other dry... that is the part that makes me worry.

Maybe Super Dave3 will chime in here... he's the Guru I'd turn to if I cant figure things out... that man knows more than I'll ever hope to about these motors.

 

[mtnclmr]

whoops sorry mountainhorse I clicked the thumbs down icon instead of the quick reply button! I just wanted to add that instead of using a 12v source to power the pump, pull the sled over couple times make sure its powering the pump itself.

 

[mountainhorse]

mtnclmr... It happens... no worries.. I've pushed or checked the wrong things myself.

Good point on the power.

.....

Is everyting on this sled, besides the poor running engine ok (lights, gauges, grip heaters etc?)

Do you have anyone with another 2005 900 near you that would let you swap, say, the ECU for testing?

 

[ALPINE SPORTS]

compression is 130 on both sides and all lights,gauges and hand/thumb warmers are working fine.
I will pull off new fuel filter and ck the flow,the sled had all the updates done on it.

Next step i guess is too pull motor and ck injectors???
How does one determine if the injectors are clogged??
Thanks
Phil

 

[jskattum606]

I had the Injector clog due to the bad fuel level float in the 05's. Same thing you are experiencing. Got two new injectors, new float and filter under waranty. Two years ago though. Rode it out on one cylinder

 

[ALPINE SPORTS]

I had the Injector clog due to the bad fuel level float in the 05's. Same thing you are experiencing. Got two new injectors, new float and filter under waranty. Two years ago though. Rode it out on one cylinder

I am going to pull out the injectors. My buddy owns a car dealership, Im going to give them to one of him mechanics to determine if they are clogged and see if he can clean them out, with something they use on cars...what do ya think??

 

[jskattum606]

Deffinatly cant hurt to try. Sounds like a good idea. good luck It will be great if it works to just clean them. Let us know

 

[speedemon]

When i had my motor apart for the rebuild, i took each individual injector and cleaned them out very well with brake clean and light compressed air multiple times just to make sure I got all the crud knocked out of them. also make sure you put new o-rings on all your injectors!

 

[mountainhorse]

http://www.witchhunter.com/

These guys have great prices and fast turnaround... look at the site and you will learn a bit.

Good luck.

 

[diamonddave]

http://www.docinjector.com/location1.htm


I've used these guys since...well since I started workin on cars..gosh 20 years.

I have had ZERO comebacks with their products. I use the guys in Federal Way.


As far as fuel injectors go...remember that these injectors are firing twice as many RPM's as the engine is turning. So take for example if you were on a full tilt pull and climb and turning 7,800 R's, the injectors would be firing 15,600 RPM's. Of course this is worse case scenario however considering trail speed RPM's being in the 5,000-6,000 range, and it's easy to see that these 2 stroke injectors are going to need service more frequently then your automobile's and trucks which typically are at a much lower firing pattern when turning 2,000 Engine RPM's at cruise.

I think it would be very important to have your fuel injectors cleaned and flow tested WHENEVER the ening is being rebuilt. Without dooing this on an engine failure, you would have no idea if a lean condition existed without performing this service. Other items may get the blame IE carb boots, various sensors, etc.

 

[ALPINE SPORTS]

http://www.docinjector.com/location1.htm


I've used these guys since...well since I started workin on cars..gosh 20 years.

I have had ZERO comebacks with their products. I use the guys in Federal Way.


As far as fuel injectors go...remember that these injectors are firing twice as many RPM's as the engine is turning. So take for example if you were on a full tilt pull and climb and turning 7,800 R's, the injectors would be firing 15,600 RPM's. Of course this is worse case scenario however considering trail speed RPM's being in the 5,000-6,000 range, and it's easy to see that these 2 stroke injectors are going to need service more frequently then your automobile's and trucks which typically are at a much lower firing pattern when turning 2,000 Engine RPM's at cruise.

I think it would be very important to have your fuel injectors cleaned and flow tested WHENEVER the ening is being rebuilt. Without dooing this on an engine failure, you would have no idea if a lean condition existed without performing this service. Other items may get the blame IE carb boots, various sensors, etc.

I just came across this thread, so I just want to give the update. I brought it to the dealer to run some diagnostics. These said all electrics tested fine including the injectors. They told me they thought a crank bearing was dragging(without taking the motor apart), I thought they were crazy that that would cause this problem. So I tore down to crank, and you could not of asked for smoother spinning bearings. So I called the tech and he said maybe my flywheel was messed up, the inner ring might be loose.(should have had me try that first..right?)That still did not fix it. So, all new pistons, rings and all gaskets and just for the hell of it I switched the injectors....and the problem followed the injector!! They said no way it could be an injector. It was.

 

[Danbot]

Glad to hear you figured it out.
Now, get that injector cleaned / replaced and ride that snow tractor!