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Dual exhaust Question

We tore down an existing system consisting of a y-pipe leading in to a dual-in/single-out cat and replaced with duals. The O2 sensor was located right before the cat.

Since this rig is mostly farm and field use, we never put cats back on and installed a short h-pipe between the duals and tapped the O2 sensor in there.

The entire system was complete minus the sensor for a couple days and during this time the SES light came on (naturally). We re-installed the sensor today and it came back on after about 20 minutes.

Is it possible it is just coming on due to the previous stored code? Will d/c'ing the battery for a few minutes do the trick in clearing it? Any thoughts?

TIA

Reply to
spam sux
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Without looking at it, I'd guess that the location is your problem. Try putting it one leg, up closer to the engine. They need to be at 600 degrees to provide enough current for a good signal, and it may be too cold there. Of course, I'd pull the code and make sure it is in fact an O2 code that you are getting. What year is it? If you've got a TBI engine, the answer is only a paper clip away.

Reply to
John Alt

problem its having right then. And I agree with John on the rest of it. There is no way the O2 is getting hot enough in that H pipe. Put it about a foot from one of the exaust manifolds. OR better yet, put the stock exaust back on if theres nothing wrong with it. minus the cat (if its plugged, and if you dont have to smog it).

Reply to
Scott M

We pulled out the old sensor and put a new one in... all is well, no problems. Get this, the one we pulled out of his truck (Dodge) had a ford sensor in it and the wires were spliced. That would explain alot :)

Reply to
spam sux

________________________________ Actually the reason for the heater is to bring it to temp quicker, not because of location. Its an emissions thing.

Reply to
Scott M

We know "it's an emissions thing".

Yes it is to bring the temp up quicker, but in your case, the H might not and probably doesn't ever see 600F. Take the advice you've been given and put it as close as possible to the original location...or I guess you can just stare that the SES light all the time. Your call.

Sam

Reply to
GaWd

Turbulent air? It's an exhaust system, where is it not "turbulent"?

Anyhoo, just got back from a 2hr trip and scored 22mpg. Last month it was

  1. Got the O2 checked and the puter pumped out a bunch of 0.2s and 0.8s when she started up then seemed to settle mostly on 0.4-0.5. Buddy told us it was "balanced".

Will keep an eye on it tho over the next lil bit. 2mpg aint much, but it all helps I guess.

Geoff

Reply to
spam sux

What I meant was, The emission gods that be decided that it wasnt good enough to let the O2 warm up on its own, it took too long, thus letting too much CO into our air when the vehicle was in open loop.

Reply to
Scott M

____________________

Forgive me but, No O2 signal and no closed loop. (not talking about O2 temp)

Reply to
Scott M

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