Busted Knuckle
OBS Enthusiast
I've had EGR codes thrown from a partially clogged cat. It wasn't until it became fully clogged did I figure that out. To test for a clogged cat, remove the O2 sensor. If it ran bad before it will run OK with the O2 out. A mild clog will need a pressure gauge.
I believe I clogged the cat by using products that knock carbon off the pistons and valves. Most notably running 500:1 syn TC-W3 2-cycle oil in the gas.
I believe I clogged the cat by using products that knock carbon off the pistons and valves. Most notably running 500:1 syn TC-W3 2-cycle oil in the gas.