Looking for some help on a friends ~2012 eXmark X-series with a Kohler ECV749 EFI engine and the 60" deck. Running on one cylinder at idle and then really rough at full throttle with RPM's surging with no load and smells like it's running VERY rich.
Put in new air filter as the one that was in it was quite dirty and packed with grass and also replaced the spark plugs which made no difference. Though the rear facing plug was very carboned up almost to the point of closing up the gap between the electrodes and the front spark plug looked completely normal/fine. Checked both ignition coils, those are both good. Did a compression test on both cylinders, which is a little misleading and hard to go by with the automatic compression release. He did say this engine has been burning some oil and insisted on using Castrol GTX High Mileage 10W-40 with like 50/50 mix of that and Lucas Oil stabilizer when I did the oil change. I actually used maybe only 1/2 a quart of the Lucas because it's so thick, I think that it might be doing more harm to the engine than good using that much in comparison to the oil. MY opinion is that is the oil alone can't do the job then what benefit is an oil stabilizer product like Lucas? Anyways...
The mower has approximately 2200 hours on it and has done a variety of commercial lawn care along with leaf cleanup with the rear mounted bagger attachment that Dave has which he uses for spring cleanup and fall leaf cleanup. He took it to a local reputable lawn equipment dealer last fall to try and get things sorted out but they were not able to determine the cause of the problem.
I suspected one of the fuel injectors would be hung up (because of the heavily carboned plug on the rear facing cylinder) so I pulled those out last night with the fuel line still connected and the rear injector is squirting A LOT of fuel compared to the front one. So I thought process of elimination... I swapped the injectors from front to back and repeated the same test and the rear injector is still spitting way more fuel than the front one. At this point this sounds like some sort of electrical issue which exceeds my level of expertise with these newer EFI lawn mower engines.
I disconnected the battery before I left for work this morning hoping that would reset the ECU or something and then I'll tinker with it some more when I get home today.
The ECU mounted on the engine cover says DELPHI on it so does anyone know if there is a way to reset the ECU on this engine? And if there is a teach process to reprogram it?
What would cause the engine control system to command way more fuel for the rear cylinder only and not both?
Any additional thoughts or advice would be appreciated!
Regards!
Put in new air filter as the one that was in it was quite dirty and packed with grass and also replaced the spark plugs which made no difference. Though the rear facing plug was very carboned up almost to the point of closing up the gap between the electrodes and the front spark plug looked completely normal/fine. Checked both ignition coils, those are both good. Did a compression test on both cylinders, which is a little misleading and hard to go by with the automatic compression release. He did say this engine has been burning some oil and insisted on using Castrol GTX High Mileage 10W-40 with like 50/50 mix of that and Lucas Oil stabilizer when I did the oil change. I actually used maybe only 1/2 a quart of the Lucas because it's so thick, I think that it might be doing more harm to the engine than good using that much in comparison to the oil. MY opinion is that is the oil alone can't do the job then what benefit is an oil stabilizer product like Lucas? Anyways...
The mower has approximately 2200 hours on it and has done a variety of commercial lawn care along with leaf cleanup with the rear mounted bagger attachment that Dave has which he uses for spring cleanup and fall leaf cleanup. He took it to a local reputable lawn equipment dealer last fall to try and get things sorted out but they were not able to determine the cause of the problem.
I suspected one of the fuel injectors would be hung up (because of the heavily carboned plug on the rear facing cylinder) so I pulled those out last night with the fuel line still connected and the rear injector is squirting A LOT of fuel compared to the front one. So I thought process of elimination... I swapped the injectors from front to back and repeated the same test and the rear injector is still spitting way more fuel than the front one. At this point this sounds like some sort of electrical issue which exceeds my level of expertise with these newer EFI lawn mower engines.
I disconnected the battery before I left for work this morning hoping that would reset the ECU or something and then I'll tinker with it some more when I get home today.
The ECU mounted on the engine cover says DELPHI on it so does anyone know if there is a way to reset the ECU on this engine? And if there is a teach process to reprogram it?
What would cause the engine control system to command way more fuel for the rear cylinder only and not both?
Any additional thoughts or advice would be appreciated!
Regards!