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By lfredg
I have a Massimo t-boss 410 in shop will not start with injector installed, have to hold above hole to get to start , if unplug tps it will run if map sensor is out. replaced ecu, map,and injector.
Still no run, pulled the valve out of throttle body it runs high idle to an idle if out a 1/4 inch, still have hold injecter out to start, but with the valve thing out you can install map and injector for it to run. what do I need to do.
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By Rocket
2020 Massimo T-Boss 410 efi, UTV has approx. 600 miles on it. Traveling down a dirt road at 20 mph and slowed down to make a sharp turn, engine stuck in fast idle. Fast enough that the clutch would not disengage. Forced it into neutral and punched gas pedal trying to get the idle speed down to where it should be. Idle started to come down from the fast idle then in about four seconds the RPM dropped to zero and engine would not restart. Towed it back to the cabin. No one around here will work on Chinese UTVs so if I don’t fix it will be just another P.O.S.
Checked:
Spark plug sparks.
Fuel injector injects.
Rocker arms rock, cam turns
Will not run on a prime. (Prime, squirt gas in the spark plug hole, replace the spark plug and attempt starting the engine.) Ordered an OBD reader and the adapter for the Massimo /Delphi 6 pin connector. Down loaded fault codes from the;
Delphi MT05 # 28265491 ECU
P0311 Cylinder 11 misfire detected
P1800 Manufacture Control
P0711 Trans fluid temp sensor A
PIC Manufacture Control
None of these fault codes matched up with any published list of the Massimo/Delphi ECU and fault code reader would not reset codes. With all these nonsensical codes it must be a faulty ECU. After all how can you have a misfire on Cylinder 11 when it’s a single cylinder engine. Ordered and Install a new Delphi MT05 28265491 ECU. (Fig. 1) After attempting another unsuccessful start the new ECU showed P0311 Cylinder 11 misfire detected. Now I know what “P0311 Cylinder 11 misfire” means. It means the engine is not running and the ECU does not know why.
An engine needs three ingredients to run, Fuel, Compression, Ignition. Confirmed it has spark, fuel, and assume it has compression. After all it had enough compression to run moments ago. Ordered a compression gauge that fits that little spark plug hole used in the Massimo to get a real reading. Compression test, 35 psi. OK, now I know why it will not run.
Guess the cylinder head has to come off to find out why it has so little compression. EUREKA, FOUND IT! A small piece of metal stuck in the intake valve seat. (Fig. 2) Therefore the intake valve would not fully close. After further examination found a piece of aluminum mesh stuck in the intake port. (Fig. 3) Checked the cylinder bore for defects caused by the aluminum fragments. None were found. Removed the aluminum fragments from the head and reassembled the engine. (Fig 4) The valve timing was a challenge doing this in the field. After reassembly tested compression, 165 psi. Attempted another start. Started right up and ran as good as it did before. Shut it down right away to check for more aluminum mesh in the induction path. The air filter is where the aluminum mesh came from. (Fig 5)
Now that all the facts are in, this is what happened. The 352cc, Chinese made Linhai single-cylinder, 4-stroke, liquid-cooled, SOHC engine with Electronic Fuel Injection (EFI) and 25.5 horsepower is a very rough running engine with excessive vibration. It rattled and shook the air filter to the point where the screen on the inside of the filter fatigued and piece of screen broke off. The screen fragments traveled down the induction path and lodged in the throttle body jamming the throttle plate preventing the engine from returning to idle speed. When I punched the gas pedal the screen dislodged and traveled to the intake valve where the screen got stuck preventing the valve from closing. The engine died and would not restart. Now I know, change the air filter yearly whether it needs it or not.
Took 20 min. of running the UTV for check engine light to go out.
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By Mike mike
Massimo 500
starts runs great then dies starts right back up runs dies
any help or suggestions
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By Bobizarro
Hello everyone, I recently picked up what I believe to be a 2013? I have an American Sportworks TW400 with a GX390 (engine serial # GCBCT-1491733 QNB2). I have a couple of questions, and any help would be greatly appreciated. First, I have looked High and Low for information on how to determine the year with no luck, and the Second question, the Ignition coil went out. Upon replacing the 4-prong coil, I noticed that the wiring from the coil didn't look right; it had 3 wires: a Yellow, a Red, and a Black ... the Yellow I know It goes to the Oil sensor and red should be power but they had the Red and Black wire plugged into each other ...I seen YouTube Video on by-passing the OIl Sensor and this look like what they did?, I can't find any wiring diagram on what and how the Red and Black wires connect to. I would like to restore the wires to the correct connection, and then how to test the Oil sensor to check if it is faulty, and if is faulty, is that why it is wired this way?
Any help would be greatly appreciated. Thanks in advance
Bob
Product Id # A4PUTXHIKDA23043A
Serial # 057778
073I13R
GX390RT2 (engine serial # GCBCT-1491733 QNB2).
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By kmiller7351
I have a 550 colman and i am trying to get running as it came from another military base. It came without keys battery and all fluids drained. So how can i bypass key switch and can i use a temp battery to start it. I want to make sure it runs first before i replace key parts. I added oil, brake, antifreeze still working on other fluids. not sure if i am missing any electrical parts. Battery in picture is junk i think. not sure what the connector is. probably will have to buy an ignition cylinder in future. So any guidance is appreciated.
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