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99 GTX RFI sputters but doesn't start

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mrpickles2000

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I bought a 99 gtx from a guy back in Feb. It needed a new bottom end and new pistons. Put it all back together and put in ski. I didn't hook up the pump yet. Injectors were soaked in Seafoam and had carb cleaner blown through them. I drained the old fuel and put in new fuel with some HEET. Primed oil pump and everything. Put the lanyard in, two beeps and fuel pump primes. Press start and motor fires and dies immediately after. I try again and it just cranks and cranks. Pulled plugs and look wet (and a little oily). Great spark, no problem there. I pull the fuel injectors and crank engine with them out. Both are spraying just fine. Put back in. I haven't checked compression yet but with new pistons and bored out cyls I would think I'd be fine (my friend has my gauge). All the sensors are the original ski's. I've checked resistance of most sensors but my meter only goes up to 1k ohm so I haven't checked everything.

If i wait a couple hours and try to start it it fires right up but dies immediately. If i pull plugs, crank a few times, and put plugs back in, it will start and immediately die.

What's going on here? Is it getting too much fuel?
 
sounds like the injectors are shot, and the engine is full of gas. You pulled them... and said "They are spraying fine"... but that's only half the story. They have to seal, and stop spraying too. Soaking them, could have killed them. Seafoam is a crap solvent, and it will eat the seals.
 
If you can see that the injectors don't drip after you stop cranking the engine then they are probably good. It is possible to accidently switch the harness connectors between the air pressure sensor and the throttle position sensor which will cause the engine to flood. Make sure the connectors are plugged into the correct sensor. :cheers:
 
The harness is hooked up according to the manual. Blue wires to the pressure sensor and other ones to the TPS. When the injectors were removed they were still holding pressure. I pushed the pin on the injector and it squirts fuel everywhere. So the injector seals are still sealing. I cranked the engine with them out and they pulse, so they're not just spraying constantly. I also tried the flooded engine feature, where i held throttle open for a couple seconds before cranking. I cranked for 10 seconds or so and then stopped. When I started to crank again, it did the whole start and immediately die. So it does sound like its getting too much fuel. Or not enough air? I set up rotary valve according to manual so....
 
You need to know if you have spark or not as the engine dies. Something could be causing the spark to leave right after start up. If spark is good then you need to check the fuel pressure. There is the possibility that there is way to much if the pressure regulator is bad.
 
check compression, must be around 155

sounds like an injector problem, believe me, you dont want to keep runnin ski a bunch with bad injectors --
 
So I checked fuel pressure today - right at 58 psi. still waiting for gauge back from friend to check compression.

I tried something new and didn't like the results. I put the lanyard in, put full throttle for a couple of seconds to do the flooded engine feature, and it started to run - like crap. It would stay running as long as i had half to full throttle, but only stayed around idle speed. It also was smoking like crazy, and not out the exhaust, but the engine itself was smoking, but I couldn't for the life of me tell where, somewhere around the exhaust??? I only ran it for ten seconds at a time and the engine wouldn't even get warm to the touch, but would still smoke. I took off the intake cover and started it, it was spewing smoke out of the intake like it was the exhaust. Sprayed a mist of oil everywhere too.

So does it have that much gas in the crank where it could keep it running for that long?

I'm really hoping that oil isn't leaking into the crankcase.
 
your rave valve solenoid, has the identical connector on it as the injectors do, check and see, it will reach the injector also, maybe you have them switched
 
checked that, and I have wiring correct according to manual. I have new injectors on the way so i'll try those and check compression and report back next week sometime.
 
I just checked compression, around 157 on front and 150 on the larger bore pto cylinder. I put in new injectors and it still does the same thing. Starts up right away then dies. I play with the throttle a it will sputter but won't restart. Both plugs sparking good. I checked ohms on all sensors and all are within range. I'm kinda running out of ideas. . . .
 
what did you set rotary valve timing at ????? and was the brass gear good when you put motor back together ???
 
Brass gear was good. I set it according to the manual. Put Mag cyl at TDC and put 0 degree mark at bottom of mag inlet hole and marked 147 degree ccw. Then put rotary valve on so it covered mag inlet. Sound right?
 
the way you just explained, you are backwards,

it should have covered the other cylinder, mag hole should be open,
 
Wow, i feel like a complete moron, I'm pretty sure I put it in complete opposite. I'll change that around and try again I guess. That would explain why it was shooting oil out the intake. THanks.
 
Problem Solved!! Thanks Griz400!! I pulled out the rotary valve and reistalled it according to the video. Engine fired right up and runs great. I guess I rushed the installation and didn't follow the directions well (who needs them anyways. . . )
 
baby it a tank or 2 of gas on a fresh overhaul, and i set my oil pump setting just a little rich, by adjusting cable on t/body, slightly past the alignment line, smokes a little more, but, good for break in
 
Pickles, don't feel bad. After reading this I realized I did the exact same thing. Just swapped it around the right way and the motor fired right up!
 
glad to see you are on the road -- (i mean water ) -- was yours acting same way ???? i think the video with a (cut out motor) is a good thing to go by !!!
 
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