ok I have a 1999 dodge ram 318 5 speed....the exhaust comes from the manifolds down to a 2 into 1 converter then out into just one pipe about 6 or 7 inches long...when I start it an let it sit I starts to smell funny from the exhaust is the cat stopped up? ive checked my exhaust an I don't see ANY o2 sensors no wires for em or nuttin the truck is a 4wd truck also....so is my cat stopped up or what? an can anyone give me any insight to where the o2 sensors are suppose to be? bcz there is 2 plugs on my cat one in front an one in rear an there just plugged off no wires goes to em or nuttin an what does the connectors look like that goes into the vehicles wiring harness? thanks in advance

 

nuttin?

 

Connectors are going to be round, or square.... four pin fellers. Should be up on top of the trans.

Getting any codes for the lack of O2 sensors?

 

What kinda smell? A rotten eggs kinda smell is a cat convertor going bad. Those 2 plugged up holes are your 02 sensor bungs. One in front of the cat, one after. Both connectors should be on top of the trans as HY said, they should be round connector up front and square for the rear. Do you have the CEL on? What codes if so? Id be surprised if you didnt have any. Make sure your plenum is good before you put the sensors on, or a leaky plenum will ruin the new ones as well.

Heres a shot of what the front connector should look like.

 

Smells like rotten meat kinda...an yea it's throwin codes for the 2 O2 sensors the truck runs good but I don't think it will run past 3k or so sometimes..... An I think te smell may be the O2 sensors makin it smell that way or maybe it's been dumpin to much fuel Into it an has caused the at to clog up or something from to much fuel bcz of the O2 sensors? Idk weather to gut the cat or what to do now

 

I have codes p0135 an p0141 an no check engine light is on I guess the bulb is burnt out

 

I wouldn't be surprised if the bulb hadn't been removed from its socket.

Pull the plug out of the hole for the front O2 sensor. Truck run better? If so, cats on its way out. If you don't have emissions testing/inspection where you are, gut it. But, still should get the O2 sensors on there.

 

I'll try takin the front plug out never thought of that.... An it doesn't have any O2 sensors so is it still ok to run it without any?

 

An I have no emissions testing were I live at

 

No its not ok to run without, you need O2 sensors. Your truck came with them from the factory, the plugs will be there for them. You will get the worst mileage without them... kinda important to your air/fuel ratio and proper operation of your motor as well. Your dumping a ton of fuel in because it can't determine what amount of oxygen is in the exhaust..... its using a preset amount. P0135 and P0141 are voltage codes for the O2 sensors, interesting.