Nobody has any advice on this? Coil maybe?

 

Could be a number of things. Bad reeds, getting to much fuel, Cdi box, injectors, low compression, volt regulator. What color are the plugs? Try switching the injectors around, check reeds and compression test to start an test the volt regulator

 

Pull compression in both cylinders....low psi can result in a tendency to foul plugs.

If that's good, my next suspect would be a leaking injector, which would explain why it loads up while idling and fouls. You can test them by pulling each out and putting ~50psi of air to the supply side with a blow nozzle and listening for a hiss coming out of the nozzle side.

Or tee a fuel pressure gauge into the fuel line....start it up, note the pressure, then shut it off....it will drop slightly as the pump stops, but then should hold that pressure for several minutes at least, there's probably a spec in the service manual since this is how injectors are typically tested in-vehicle.

 

Thanks guys I've checked reeds already look good looking at them all flat and seem to seal good at the cage. Compression is 140psi per side so I was thinking that wasn't the problem. I have a pressure gauge installed that sometimes reads 44psi while running sometimes 47psi while running dunno why the fluctuation. Tonight ill check how fast it bleeds down or ill put air pressure to the injectors to see if its leaking by. Can the injectors be cleaned or something? The injectors might explain the erratic idle it has it bounces from like 1650-2150 constantly. I don't remember it ever doing that before. If you take the gas cap off you can hear the fuel pump whining or howling pretty loud. Is that normal? Plugs also look black n oily. Oil appears to seep into the threads also. Oil pump maybe rich but sled got 4000 miles on it like this.Thanx for advice

 

How wet are the plugs?

 

Does this sled have a timing key in it?

 

These laydown motors are set to run rich on oil from the factory, on my 700 2 turns out on the linkage rod seemed to make a good difference.


It's possible to clean injectors, though it's a little tricky since to blow anything through them, you have to supply +12v jumpers to the terminals to open them. Terminals are very close together, carb cleaners and solvents are flammable, you get the idea. Don't leave an injector plugged into steady voltage for more than a few seconds or it will overheat and possibly damage the piezoelectic inside. Use air only, or a non-flammable degreaser/solvent.

If that doesn't help I'd replace the injector.

 

The sled does have a 3 degree key in it to ans mikes question. So if the injector on that side is leaking by I need to replace? The fuel pump suppose to be noisey with the cap off? Not alotta fuel in it but enough. One would still think the pump would be quiet. Thanx

 

I mean if it's making an awful racket in there it could have issues, but some whirring noise with a low fuel level and the cap off isn't anything to be worried about. Dying fuel pumps often have an irregular "note" to them while running. If the whirr jerks around in pitch or loudness the pump and/or regulator inside may be malfunctioning.

Since the issue is targeted at only one cylinder I still vote for a leaky injector. Swap them and see if the problem moves to the other cylinder. If so, attempt to clean or just replace the injectors. I'd replace both, if one has gone bad chances are the other isn't far behind it.

 

Thanks the pump whir noise as you stated just seems loud at times sometimes if you take cap off you can't hear anything. Ill try cleaning injectors. What the best way to power 12v to them to open them and clean? You would think if injector was hanging it would flood out all the time. To check coil can the wires be flipped flopped or no? Would seafoam help also? Thanx

 

Probably a bad coil. Swap them and see if the problem moves to the other cylinder

 

The injector doesn't necessarily hang totally open, but it may not be shutting all the way and allowing a small amount of fuel to leak by even when in the closed position. Such a leak would cause the fuel pressure to bleed off fairly quickly once the pump stops running.

During normal running this extra fuel doesn't really matter and is just burnt off, but at idle it will eventually load up that cylinder if not "cleaned out" by rapping on the gas.

You can carefully use a couple jumper wires to any 12v battery to open them.