I have a Walker Lawn Mower with a Kohler Command Pro 26 EFI engine in it. It ran fine when I finished last season. When I started it this year for the season it would run fine until I engaged the blades and then it lost power and had a miss in it and would backfire when idling the Engine down. So I took all the old gas out and put new gas in. I replaced the spark plugs. It made no differences in the way it runs. When I replaced the spark plugs I noticed one of them was wet and clean and the other one was black and dry. So I looked at the new plugs after I changed them and ran it some. Same thing on the new plugs, one wet and clean the other one dry and getting black. I checked the spark on both sides and found that they both had spark. They both jumped about a half inch gap on a spark tester. If I start it at an Ideal and pull the spark plug wire of the wet clean plug the Engine dies. If I do the same on the other spark plug it stays running with the missing sound staying the same.
I am confused a little because I have spark on both sides. I pulled the spark plugs and put my finger over the hole and cranked the Engine over, it feels like it has good compression on both sides. I have ran the Engine with the gas cap off, runs the same. Ran it with no air filters to see if that changed it any and it did not. I looked inside the gas tank while it was running and it has good gas flow coming out the return line. Any ideas or help please. Thanks
I am confused a little because I have spark on both sides. I pulled the spark plugs and put my finger over the hole and cranked the Engine over, it feels like it has good compression on both sides. I have ran the Engine with the gas cap off, runs the same. Ran it with no air filters to see if that changed it any and it did not. I looked inside the gas tank while it was running and it has good gas flow coming out the return line. Any ideas or help please. Thanks