What did you do about the rear O2 sensors? Any issues with the ECU? Was this a price/performance based decision or a problem-solver decision?
Any pics would be great too. Thanks.

 

*** NOTE *** The 94 -'95 DI's do not have O2 sensors downstream from the cats. Only two upstream to sense O2 levels from the manifold... the only purpose of the "rear" O2's is to confirm proper function of the cats.

This was a performance / cost based decision. No need to replace cats ever again due to rich running killing the cats and a noticable difference in throttle response and power at lower end of power-band.

No issues with ECM since it was unaffected by this modification... it still received the O2 signal. In fact, I have noticed a slight increase in MPG.

F the Govt for putting Ethanol in my gas!!

 

Not to get this thread off topic.. But in regards to the "cat rattle".. can someone elaborate on this? I think i may have the same issue.. My guess is the honeycomb inside the cats has degraded and is now bouncing around in there?

 

x2 they are paying farmers to grow ethenol crops forcing us to use it in our gas and killing our mpg, how many more gallons a year am I having to burn for them to save the planet.

 

Thats is correct. The guts are falling apart and rattle.

 

and 1ton of water to make 1 gal of eth

 

look what I found
http://pure-gas.org/index.jsp

 

LOl there's only 5 stations in my state according to this, and 3 on them a marinas....


And yes F*** the government!!!!

I plan on removing mine too as we dont have emissions in my county, those tests are just another way to bone you out of more of your hard earned money.

 

I'm lucky, and have multiple stations around me with no eth gas, I normally use 93 from chevon, just seems to run better.

On the cat/o2 issue, its a road I have been down a few times.

First off, I live in Dade County GA and it is legal to remove the cats here. Anyone will do it for you not a big deal at all. (Yes I understand that the law is federal, but I also don't see a lot of feds running around here checking)

Ok, that out the way, I removed the cats/p2's from my 99 Salty, didn't seem to make much differance, but the truck was a pile to begin with.

On my 96, I ran it back and forth to the shop for a total of about 50 miles with open headers... honestly, not that much difference, just a LOT louder. Have a new set of magflow cats, and a flowmaster 50 under it now and the o2 hooked back. Still having a tuning issue I hope to solve this week.

For anyone wanting to remove the rear o2 correctly I do have a set of computer chips that replace them. They simulate the heater etc so you get a correct reading. I was going to use them, but ended up just putting the cats on. I want 100 bucks for the pair, but in no hurry to get rid of them as I might use them on the next rover I buy, since I plan on it being a woods trucks.