Hi Guys,
I'm new to this forum, and have learned alot on here in the past few weeks.
This past summer, I purchased a used 2014 T4 with 900 miles and 192 hours.
Because my machine was due for the 200 hour service, I performed all the tasks in the owners manual.
I changed all the fluids: Engine oil and filter, Front diff, Rear diff and cleaned the air filter.
Ran the valves and adjusted them within spec.
upon my first ride down the dirt road, while holding steady throttle- the engine seemed to bog down- slower and and slower until suddenly, it came back alive and back up to the speed I was running - 26-30 ish.
It sounds like it drops a cylinder or is running too rich until it almost dies and then comes back up to the rpm that you are holding.
I've checked everything I can think of:
pulled the fuel tank, cleaned and drained all the fuel, performed the vent tank mod, replaced the fuel screen on the bottom of the pump.
replaced spark plugs
checked all the wiring and connections- even pulled on the coil wires and plug boots while riding down the road- no change.
Checked the air intake and ensured there was not any unmetered air going into the intake ports. all clamps and bands are tight.
Cleaned the spark arrestor.
I can recreate the issue just by holding the throttle at a steady spot while driving- around 1/3 or 1/2 throttle. it does't do it at full throttle, or at idle. if you are constantly on and off the gas- like riding a trail, you'll never notice it. because it only happens when going steady.
last week I tried something that may add to the confusion- riding down the road at constant throttle, the engine started to bog down again, so I pulled the transmission back into Neutral, and it immediately rev'ed back up! After I coasted to a stop, reengaged the transmission, and took back off. Now i'm thinking could it be related to the load the clutch is putting on the engine?
*note that this bog never happens in neutral- I've tried by holding steady throttle while parked. The motor purrs like a kitten.
I've disassembled, cleaned and inspected the entire clutch assembly, didn't see anything wrong.
I've been a mechanic all my life- but this one has me stumped.
I was thinking maybe fuel pump or Throttle position sensor, but it only does it under load, while driving.
I've seen several other guys have a similar issue, but not a definitive answer.
Thank you in advance for you help and advice!
I'm new to this forum, and have learned alot on here in the past few weeks.
This past summer, I purchased a used 2014 T4 with 900 miles and 192 hours.
Because my machine was due for the 200 hour service, I performed all the tasks in the owners manual.
I changed all the fluids: Engine oil and filter, Front diff, Rear diff and cleaned the air filter.
Ran the valves and adjusted them within spec.
upon my first ride down the dirt road, while holding steady throttle- the engine seemed to bog down- slower and and slower until suddenly, it came back alive and back up to the speed I was running - 26-30 ish.
It sounds like it drops a cylinder or is running too rich until it almost dies and then comes back up to the rpm that you are holding.
I've checked everything I can think of:
pulled the fuel tank, cleaned and drained all the fuel, performed the vent tank mod, replaced the fuel screen on the bottom of the pump.
replaced spark plugs
checked all the wiring and connections- even pulled on the coil wires and plug boots while riding down the road- no change.
Checked the air intake and ensured there was not any unmetered air going into the intake ports. all clamps and bands are tight.
Cleaned the spark arrestor.
I can recreate the issue just by holding the throttle at a steady spot while driving- around 1/3 or 1/2 throttle. it does't do it at full throttle, or at idle. if you are constantly on and off the gas- like riding a trail, you'll never notice it. because it only happens when going steady.
last week I tried something that may add to the confusion- riding down the road at constant throttle, the engine started to bog down again, so I pulled the transmission back into Neutral, and it immediately rev'ed back up! After I coasted to a stop, reengaged the transmission, and took back off. Now i'm thinking could it be related to the load the clutch is putting on the engine?
*note that this bog never happens in neutral- I've tried by holding steady throttle while parked. The motor purrs like a kitten.
I've disassembled, cleaned and inspected the entire clutch assembly, didn't see anything wrong.
I've been a mechanic all my life- but this one has me stumped.
I was thinking maybe fuel pump or Throttle position sensor, but it only does it under load, while driving.
I've seen several other guys have a similar issue, but not a definitive answer.
Thank you in advance for you help and advice!