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My scag TCII with he EVC860 is bogging down under a load and flashing a 0174 lean fuel at high throttle code, Anybody have a quick fix to try before loading up to take a long ride to the dealership?

Most of the hints point to O2 sensor issues or wiring, an exhaust leak. Bad fuel pump or plugged fuel filters. Or possibly engine ground wire issues.

Any idea where the motor ground is located?

Had a ECV680 doing the same thing and it turned out to be the O2 sensor. Unplug the O2 sensor and see how it runs.

BrentW said:

Any idea where the motor ground is located?

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Chase down the - battery post to frame. Follow it to where it connects.

slomo said:

Chase down the - battery post to frame. Follow it to where it connects.

Click to expand...

BrentW said:

Any idea where the motor ground is located?

Click to expand...

Also need to check smaller wires that are connected to the engine block with bolts. Most likely will be black wires.