93 Fzj80 engine random idle and popping?

[wesley993]

Needing help diagnosing my rig. Since the above symptoms. I have deleted my pair reed ( mainly because o2 sensor was rusted too much to remove so relocated) new o2 sensor. Waiting on the other sensor to come in. Plugs. Wires. Rotor and cap. Are about 11k old. Vacuum lines look good. EGR not been deleted yet. Wiring harness doesn’t look burnt. Starts up good but gets worse longer it runs? Could this be from the one o2 sensor I’m still waiting on from the parts store? Tia for any help.

 

[wesley993]

For anyone wondering the very back spark plugs bottom ceramic had broke in half. Never had that happen.

 

[CharlieS]

Any idea why/how?

 

[wesley993]

Any idea why/how?

I don’t know? They were denso plugs. Perhaps a faulty plug? I changed all of them out for ngk plugs. If it happens again I’ll really be scratching my head.

 

[DIRTBIKEUSA]

Egr malfunction? Exhaust back pressure?

 

[wesley993]

Egr malfunction? Exhaust back pressure?

Could be? I’ve convinced myself to do a egr delete after this.