Somebody messed with the O2 sensor!
#1
Somebody messed with the O2 sensor!
I was reading up on a bunch of ram stuff and most everybody who talks about o2 sensors talks about 2, one infront and one behind the cat. Mine only has one and they previous owner did a s**ty "custom" muffler job. I have a suspicion that my truck is suppose to have two. No CEL or anything, but who knows.
Its a 1999 dodge ram 1500 5.9 sport
Its a 1999 dodge ram 1500 5.9 sport
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So these trucks do have two then...I need to check all the wiring I suppose. I CEL works, so I guess its down to finding the original wiring for it and remounting sometime maybe? I am almost positive the O2 is down stream of the cat. Means my air fuel might be messed up? Maybe that and possibly a plenum is why I only get 8 mph, or that its just a gas hog to begin with...
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#8
So these trucks do have two then...I need to check all the wiring I suppose. I CEL works, so I guess its down to finding the original wiring for it and remounting sometime maybe? I am almost positive the O2 is down stream of the cat. Means my air fuel might be messed up? Maybe that and possibly a plenum is why I only get 8 mph, or that its just a gas hog to begin with...
#9
The Downwind O2(after the Cat) is for the cat, It just makes sure its working properly. The upwind is before the cat and that is the one that control A/F ratio. The plenum leaking can cause the upwind o2 to foul and plug the cat. they both can contribute to your bad fuel economy.
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