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Millerbobcat225gplus/serial#kf866447 weldingmachine/generator machine will not fire in start position when start switch is released to run position it will fire and pop loudly through the exhaust it has a 16hp onan performer engine

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How old is unit ?? bad switch, motor needs tune up??cam ,valves, compression???

Posted on Jan 14, 2009

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Posted on Jan 02, 2017

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My onan 4.0 generator will not idle and is back fireing while trying to run it will run fine for ten min then starts trying to die and starts back fireing when I try to keep it running


check for a faulty sump oil switch . check for faulty coil ( magneto on the flywheel) as the time it runs suggests that it is breaking down internally.

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RYOBI 1000w Digital inverter generator. ...will not start... we have followed the instructions provided and we cannot get the genny to fire up..... oil level is fine, switches on the correct position,,...


have had the same problem with a Ryobi 1000w invertor generator. The problem that you are experiencing is the low level oil switch. To confirm if this is the problem disconnet the low level oil switch (Yellow or Orange wire). Try and start the generator now, it should start with the first little tug on the recoiler. Once it is running, reconect the low level oil switch and see what happens then. Either it will cut out, then you know it is the oil level switch or it will continue running and the problem will go away. Please ensure you manually check the oil level first before starting.

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1 Answer

98 durango is firing but wont start


If the engine is actually firing when the switch ii in the 'start' position and it dies when you release the switch to the 'run' position, the problem could be the ignition ballast resistor - usually mounted on the firewall. The ballast is a white ceramic rectangle with wires connecting to it

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1 Answer

I have a onan 6.5 emerald gen,when you start it it quits as soon as you let go of the start button, will run fine while holding start button on,then quits when you release,please help,maybe field not...


More likely the switch is bad, and only make run contact when in the start position.
Easy to test the switch continuity with a ohm meter when it is not running.

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1 Answer

WHEN I START THE GENERATOR I HAVE TO HOLD THE START SWITCH ON TO KEEP THE GENERATOR RUNING.


The switch should be three positional.
The upper position is only for starting. Continuous running is in the middle (self holding) position. Lower position is to stop the generator.
If left in middle position it is not running you may have the switch bad, or the generator is stopped by low oil level.

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Generac 6500 1988 in R.V.Southwind Two things, both only occur in the morning or when cold (I am in So Cal so not that cold). First, when starting the generator from the dash board starter button the light...


See if there is an oil pressure guage on the dash. When you start the machine it probably has a low oil pressure shutdown which shuts the engine off when you release the start button. This is an interlock. Watch the oil guage and keep the start button engaged until you see oil pressure, release the button and it will continue to run at that point. Your second issue may be a function of the choke. If you are having to choke the engine to start, you may have to play with the choke position to keep from overfueling the unit which may cause it to stall and possibly backfire as it has to much fuel to be burned on the compression stroke, and is igniting occasionally on the intake stroke. Hope this helps. Marvin

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Hello, I have a Briggs & Stratton 7000 watt generator Home Standby with manual transfer switch, it starts but when you release the switch into run mode it dies, any ideas? Generator has been in service...


These units are equipped with a low/no oil shutdown. When you hold the switch over to start it, it overrides the shutdown interlock until the unit builds oil pressure in the engine. When you release the switch to the run position the interlock is engaged. Ensure there is sufficient oil in the crankcase, check the wiring from the oil pressure switch to the ignition cutout-(it may have been pulled off or damaged). If that checks out, then either jump across the 2 wires at the oil sending unit or disconnect the harness from the sending unit to test to see if the sending unit is bad. Try both unless you know the switch is normally open or normally closed. Replace the sending unit if needed.

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RV Onan Emerald 1 Generator


Check all the ground wires and make sure their not broken or loose. If the wires are good next check the neg. Wire to the coil. Too check the swiitch make sure you have continuity too all the post when the switch in the on position, this requires removing the switch.

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2 Answers

Millerbobcat225gplus welding machihe w/onan16hp performer engine


carb is probly gumed up. I would put in a good dose of fuel injector cleaner in the fuel and start the engine llet it run 5 minites shut idown. What 2 days then restart,it should run fine. PS put sunoco ultra fuel in tank before you put in clean4er.drain tank before you start.

Dec 13, 2008 | Welding Tools

1 Answer

1998 Cadi Deville


First off you need to know how these thing's work ,computer controlled .

Trunk Release Function
When the PZM receives a serial data message for the activation of the trunk release solenoid from the instrument cluster or from the RFA, the PZM energizes the trunk release relay under the following conditions:
• The transmission is in PARK
• The valet lockout switch is not activated.

Components
This vehicle has electronic components which the service technician controls in order to provide valuable self-diagnostic information. These components are part of an electrical network that controls various engine subsystems and various body subsystems. A description of each of these subsystems is in the appropriate subsection of this service manual. These major components that compromise the computer system monitor the system sensors and the system switches. These components are the following:
• The powertrain control module (PCM)
• The instrument cluster
• The air controller module (ACM)
• The sensing and diagnostic module (SDM)
• The electronic brake and traction control module (EBTCM)
• The continuously variable road sensing suspension module (CVRSS)
• The body control module (PZM)
• The integrated radio controller (IRC)
• The remote function actuator (RFA)
• The climate control panel (CCP)
• The cellular telephone (PHN)
System Functions
The body control module (PZM) performs the following functions:
• HVAC afterblow control
• Battery guard
• Door lock and unlock
• Fuel level
• Retained accessory power (RAP)
• Theft deterrent
• Exterior lighting control
• Interior lighting control
• Trunk release
• Time of day for the radio display
• Rear defogger
• Fuel door release
• Vehicle personalization
For more information about these functions refer to the appropriate sections.

Your probably have a lose connection somewhere , ground for the BCM or instrument cluster . Behind the dash or instrument cluster ! or other places . G-400 ,G205

The instrument cluster supplies the turn on signal for the alternator

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The generator provides the voltage to operate the vehicle's electrical system and to charge the battery through CKT 1 (RED). When the ignition switch is placed in RUN, narrow width pulses on CKT 23 (GRY) are supplied by the powertrain control module (PCM) to the rotor, creating a weak magnetic field. When the engine is started, the regulator senses the generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This regulates the generator output voltage for proper battery charging and electrical system operation.
The PCM turns on the VOLT indicator via Class 2 serial data line CKTs 1807 (PPL) whenever undervoltage, overvoltage, or a stopped generator is detected on CKT 225 (RED).

When the ignition switch is placed in the RUN position, voltage is supplied to generator terminal L by the instrument cluster, turning on the regulator. The generator's voltage regulator controls current to the rotor, thereby controlling the output voltage. The rotor current is proportional to the electrical pulse width supplied by the regulator. When the engine is started, the regulator senses generator rotation by detecting AC voltage at the stator through an internal wire. Once the engine is running, the regulator varies the field current by controlling the pulse width. This operation regulates the generator output voltage for proper battery charging and electrical system operation. The generator F terminal is connected internally to the voltage regulator and externally to the PCM. The PCM monitors the field voltage on the generator F terminal.

It's more then likely just a lose connection somewhere . Could take half your vehicle apart to find it .

My first place to look would be here , G400
In the left rear of the passenger compartment, under the rear seat
BCM ground .

Mar 30, 2017 | 1998 Cadillac DeVille

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