Governor cutting out

Queen bee · May 2, 2018

Hello, New to the forum.

I have a Mahindra 4550 4WD 2016 model. The check engine light comes on and the governor will not kick in. I understand that sensors control that to protect the engine. I blew out the air filter and it went off and I cut grass for another 8 hrs. Several weeks later I get on the tractor and the same thing happened. I replaced the air filter and only after 15 minutes it happened again. I took the filter out and still cannot get any power out of the tractor. My question is, "Is there a airflow sensor that needs to be cleaned and where is the location of that sensor? I have been searching the internet and haven't found any information about the location of the sensor. I would appreciate any advice.

RNeumann · May 2, 2018

I don’t know the specifics on that motor but the computer controlled motors need to know air speed/volume going in the motor. It’s typically a Mass Air Flow Sensor (MAF) and it would have to be between the air filter and the motor- just look for a sensor/wires in the intake- typically the plastic part or right where the plastic meets the intake manifold. The sensor is extremely sensitive and most damage them trying to clean it. Try to get some MAF cleaner (most auto parts stores will have it) and cross your fingers cleaning it.

Queen bee · May 3, 2018

I went and look this afternoon. There is a vacuum sensor right behind the air filter. I unplugged the two wires and unscrewed it. I can put a vacuum on it with my mouth and hear the switch working inside. I also put an DDM on the switch to verify that it was working. I blew out the hole that the sensor screwed into. There is a fine porous plug in there. Reinstalled the sensor and tractor ran fine for about 45 minutes. Check engine light can back on. I stopped the tractor and repeated the process. The tractor only ran for about 15 minutes this time. There is also another sensor located closer to the intake. It has 4 screws that hold it on. I was wondering it that sensor needs to be taken off and cleaned also. I looked at some parts breakdown of the tractor but none of the ones I found show the sensors.

Navasot · May 3, 2018

Have you done the ECU flash?

Queen bee · May 3, 2018

Do know how.

Navasot · May 3, 2018

Take it to your dealer they are the only ones who can do it... easy way to tell if you need it is if you cut the key on the glow plug light should come on for at least 30 seconds.. there was a campaign for all 4550s early on for an ecu flash... no glow light, no temp reading, loss of power was common issue

Queen bee · May 3, 2018

OK, thanks. I will check that this afternoon.

dickfoster · May 3, 2018

Queen bee said:
I went and look this afternoon. There is a vacuum sensor right behind the air filter. I unplugged the two wires and unscrewed it. I can put a vacuum on it with my mouth and hear the switch working inside. I also put an DDM on the switch to verify that it was working. I blew out the hole that the sensor screwed into. There is a fine porous plug in there. Reinstalled the sensor and tractor ran fine for about 45 minutes. Check engine light can back on. I stopped the tractor and repeated the process. The tractor only ran for about 15 minutes this time. There is also another sensor located closer to the intake. It has 4 screws that hold it on. I was wondering it that sensor needs to be taken off and cleaned also. I looked at some parts breakdown of the tractor but none of the ones I found show the sensors.

Most MAF (mass air flow) sensors are the hot wire type that use current required to maintain a hot wire at a specific temperature as a gauge to how much air is flowing in the intake. If these wires become fouled with dirt and contamination it throws the whole engine management equation out of kilter. It's easy to clean them with plastic safe electronic cleaner or like solvents labeled specifically for this purpose but it's best NOT use mechanical means to clean them. Simply point the cleaner spray at the sensor wire and give it a squirt or two. Examine and repeat as necessary. When properly cleaned, the sensor should perform as new so there is usually no need to replace it unless you break it.

Queen bee · May 17, 2018

Well I ended up taking the tractor to the dealer where I bought it. Needless to say I am not happy about that. I should not be having to take a new tractor with only 125 hr. in for service. The dealer said had several codes and coming up showing there was a problem with the fuel system. The technician said he was going to start with the fuel filters and move on from there. That has been a week and a half and I have not got it back yet.:thumbsdown: