Just a little back ground. I have a 2006 RMK 900, bought it used 4 years ago with 100 miles. I had a tps harness issue 3 years ago, replaced the harness and have had 1700 perfect miles. At the end of last season, I decided to do some preventative care. I sent the bottom end to Indy Specialties for a TMI, sent the cylinders off for inspection and hone. Ordered a new oil pump as the bleed screw was striped on the old pump. New TPS Sensor. I sent the Injectors to Witch Hunter to be cleaned and tested. The thing is basically new. To make a long story short, just got things back together last week. The issue is with the Idle, it is super erratic. I have checked and double checked the TPS setting. It will idle around (1500-1600) then go for a ride around the yard will idle at (2100-2200) it doesn't settle down. Then shut if off and it will idle at (1000 -1100) and want to die. Any ideas? I'm getting frustrated! Just tried to do some preventative maintenance and now I have a disaster! Help!!!!
Erratic Idle
- Thread starter dyrengd
- Start date
Are you sure it's firing on both cylinders? I had a similar problem recently when I put my brother's sled back together turned out that the MAG side injector had a broken wire. I pulled it out soldered the broken wire, added some heat shrink, taped it up really well and good as new.
What about the TPS?
What about the TPS?
Ok, took the sled for a ride today. I still have the erratic idle, and a midrange stumble. It seems to go good on the top end. I replaced the TPS Sensor, I set it at .710 which is in the middle of the specs. .705-.715, adjusted the idle to .930. I may bump that to .940 as i live at 5500ft and ride primarily at 9500-10500ft. Any ideas as to what the idle and midrange stumble could be. Any suggestions would be appreciated.
Thanks - Darren
Thanks - Darren
checked and cleaned the exhaust valves when i did the top end and installed the TMI from indy specialties. todays ride was the first since i installed the motor. Could this be a fuel injector issue? I haven't gone there yet because I just had them flow tested and checked by witch hunter and reinstalled them with the motor. How would i go about diagnosing an injector? Help!!! Please!!! Help!!!!
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D
Danbot
Well-known member
Can't comment on how to test injectors, but you should be reasonably confident they are good since they just came from witchhunters. You could however test the injector wiring for clean continuity if you feel the need to hunt in that direction.
I have some input of my own...
was the engine pressure tested upon assembly?
condition of reeds?
verify fuel pressure?
Erratic idle screams lean condition to me. I had similar symptoms a couple times. Once it was a "foreign object"
stuck in the throttle body messing with the butterfly. Another time a reed petal came apart. The last time was a leaking cyl base gasket.
I have some input of my own...
was the engine pressure tested upon assembly?
condition of reeds?
verify fuel pressure?
Erratic idle screams lean condition to me. I had similar symptoms a couple times. Once it was a "foreign object"
stuck in the throttle body messing with the butterfly. Another time a reed petal came apart. The last time was a leaking cyl base gasket.
Can't comment on how to test injectors, but you should be reasonably confident they are good since they just came from witchhunters. You could however test the injector wiring for clean continuity if you feel the need to hunt in that direction.
I have some input of my own...
was the engine pressure tested upon assembly?
condition of reeds?
verify fuel pressure?
Erratic idle screams lean condition to me. I had similar symptoms a couple times. Once it was a "foreign object"
I would do the pressure test like Dan said. Maybe a crank seal didn't seal properly. Also check the TPS harness wires again for a cracked or broken one and look inside it make sure the connection is good.
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How do i pressure test? Willing to do it, just don't know how. I just pulled the plugs, they look great. Pulled the throttle body boots and reeds, they we all sealed up great, boots look good so do the reed valves. I inspected each reed. Do I need to take this to the dealer? Can I have wiring issues without it throwing a code? The seld is not throwing any codes on the check engine light. Anyone know of a dealer they trust in Utah?
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you need to buy or borrow a compression tester and then you thread that into the holes for the spark plugs and pull the engine over several times with the key off and kill switches engauged until the gauge stops building pressure.
Ok, got the sled back from the dealer, and still have the mystery. They put the sled on digital wrench. The TPS harness communicates and is spot on! The Fuel Pressure is solid and steady at 116 PSI this was verified with the gauge installed and riding it around the field for 15 mins watching the whole time. The Fuel Pump is good. The Injectors have 10 miles on them since being tested and given a clean bill of health from witch hunter. I'm not sucking air for a lean condition this has been verified every way posible, the reed valves are good and sealed tight. That leaves the Stator and the ECU that could be suspect. Anyone have any other guesses. The snow is good and I'm sitting home
. Help!
. Help!
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