Catalitic converter or missfiring? Please help

[Guy Picciotto]

She is 95, second gen explorer. After getting the codes of 335, 336 I've changed the egr valve, egr sensor and egr selenoid. The idle was rough, was under a little bit 1000 rpm. Engine did not want to raise on 2000rpm while climbing, engine was loosing power. After changed everything engine light still shows up, getting the fault code of 337 now. Gained more power, idle is still rough a little. But I still hear popping sound from exhaust.

A technician said, the problem is missfiring, the other one said it is catalitic converter so I am confused. I hear a little popping sounds from exhaust..The spark plugs and cables have renewed recently.
What do you think? Thanks for comments..

 

[C420sailor]

Those codes are for your crankshaft position sensor and circuit, so I don’t see the link with EGR/cats.

 

[Guy Picciotto]

Those codes are for your crankshaft position sensor and circuit, so I don’t see the link with EGR/cats.

For the OBD2 you are right, but it is obd1

 

[C420sailor]

Ah ****. I always forget the 95 is OBD1

 

[rasouth]

Maybe check radiator level. Might be leaking a little coolant into a cylinder and fouling up a plug and letting coolant into your exhaust. My '96 was doing that and was not throwing a code.