KOHLER Command Pro 26 EFI CH26 Backfiring and Bogging down/losing power

wilkin58

wilkin58

Forum Newbie
Need help or advice. Kohler CH26 is backfiring and bogging down/losing power. Here’s what I’ve done so far.

-Drained old fuel out of tanks and replace with new fuel
-Replaced fuel filter
-Replaced spark plugs
-Verified fuel pressure is @39psi
-About to replace ignition coils when they arrive.

Anything else that might be my problem?

I pulled the valve covers off because they were leaking oil and the oil is thinning out and smelling like fuel a bit. Going to do a compression test soon.
 
Is the MIL light illuminated. That can give us direction for fault codes. And stop doing the shotgun parts replacement until we have more information to go on. Like are you loosing fire and that is the reason you are replacing the ignition modules. And lets find out compression but I doubt that is a concern.
 
ILENGINE said:
Is the MIL light illuminated. That can give us direction for fault codes. And stop doing the shotgun parts replacement until we have more information to go on. Like are you loosing fire and that is the reason you are replacing the ignition modules. And lets find out compression but I doubt that is a concern.
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Yes looks like light is illuminated. I don’t know anything about fault code system though so I apologize. I see red light on, but don’t know how to read the codes?

Not sure if it’s loosing fire. The backfiring only seems to be when it warms up and gets hot, and faulty coils I thought tend to be culprit cause they can do well cold but not warm.
 
ILENGINE said:
Is the MIL light illuminated. That can give us direction for fault codes. And stop doing the shotgun parts replacement until we have more information to go on. Like are you loosing fire and that is the reason you are replacing the ignition modules. And let’s find out compression but I doubt that is a concern.
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So I followed some directions, and the light blinks 2-3-6-1 and then pauses for 3 seconds and goes solid light.
 
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Should be a four digit error code. And post the model and spec of the engine so I can make I am looking at the correct service manual.
 
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StarTech said:
View attachment 73163
Should be a two or three error code. And post the model and spec of the engine so I can make I am looking at the correct service manual.
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It’s a Kohler CH26S, spec #78518.

I followed the directions, light blinks twice-one second pause-three times-one second pause-six times-one second pause-one time-3 second pause-then solid light( 2-3-6-1)
 
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