I've about got this project done.
Post Fiend
Joined: Mar 2002
Posts: 19,402
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From: Bonita Springs FL
Originally Posted by EPNCSU2006
The computer doesn't know, and even if it did, it can't vary individual cylinder pulse widths. Your speculation is well founded 
So here's my input on this, in the form of a question:
I have always theorized to myself that it would be possible to have a true dual exhaust with no crossover as long as one side had an O2 sensor installed. The sensor doesn't care about the total volume of exhaust, it only analyzes the mixture passing by and looks at the amount of uncombusted oxygen in the exhaust stream. So why would installing an O2 in only one side NOT work?
The only downside I can see is that if you were running rich for some reason (stuck injector, bad FPR) and you were burning WAY too much fuel, the MIL code for a too-rich O2 sensor wouldn't show up.
Big deal. I can live with that. Am I way off on this? Conanski's post seems to back this theory up.
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Junior User
Joined: Jan 2006
Posts: 53
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well I had headers for the truck and i had the passenger side drilled and tapped for the o2 sensor but I wound up going back to manifolds because of some fitment issues. Everyone seemed to agree that it would work on just one side of the motor but then again just asking novice gear heads and such.
Elder User
Joined: Jun 2006
Posts: 805
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Headers & O2 Sniffers
Originally Posted by 891/2ton
well I had headers for the truck and i had the passenger side drilled and tapped for the o2 sensor but I wound up going back to manifolds because of some fitment issues. Everyone seemed to agree that it would work on just one side of the motor but then again just asking novice gear heads and such.
I bought Ford Racing shorty headers for my '92. (5.0L 5spd) They came with O2 bungs on both, and I'm considering moving the O2 sensor to the header on the right bank. Now, here comes the tricky part. Would a plugged up cat cause issues after the engine gets up to operating temp? I've been chasing driveability issues on the old girl for a long time, and have donated much hard earned cash to the local Ford dealerships. After all my charitable contributions, I find that they no longer have the proper test equipment at the dealers to test the EEC-IV. This would have been nice to know about 5 years ago, when they were ditching the stuff. The truck has 135K on it, and the only thing in the exhaust that's been replaced was the muffler and tail pipe. Hmm, come to think of it, that's all that's been replaced on the engine, period.
The driveability issues have varied some, but the common factor appears to be temperature. It runs just fine (will slap your head against the back window) when it's cold, but pretty significant power loss and random miss after it gets up to operating temperature. Is this because of the O2 sensor being bypassed until the t-stat opens, and then sensing rich exhaust in front ot a plugged up cat? I'm not looking forward to replacing both cats, that's for sure, and this will probably be last ditch to solve the issues since it's the most expensive. I don't have a welder or access to pipe bending equipment, otherwise, needless to say, it would have new dual exhause from the headers.
I'm ready for a good rumbling exhaust, so any recommendations?
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