Wondering why 4 O2 bungs in MAC ORP?
Thread Starter
TECH Resident
Joined: Nov 2002
Posts: 996
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Wondering why 4 O2 bungs in MAC ORP? I just received my mac headers with ORP. I plan on welding in a pair of carsound cats into the ORP. I noticed that the ORP already gas bungs for all 4 O2 sensors!
What would happen if I used no cats, and hooked up all the O2 sensors in the stock configuration. Would I throw codes because the rear sensors' readings would show the cats (which are missing) are not working properly?
Just wondering....
It seems like if you buy an ORP, MAC might as well eliminate the rear O2 bungs since you will probably be running SIMS anyway... or do the SIMS connect "between" the sensor and the PCM, so the holes are still needed?
Thanks!
Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
What would happen if I used no cats, and hooked up all the O2 sensors in the stock configuration. Would I throw codes because the rear sensors' readings would show the cats (which are missing) are not working properly?
Just wondering....
It seems like if you buy an ORP, MAC might as well eliminate the rear O2 bungs since you will probably be running SIMS anyway... or do the SIMS connect "between" the sensor and the PCM, so the holes are still needed?
Thanks!
Tommy <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
On The Tree
Joined: Jan 2003
Posts: 172
Likes: 0
From: Central MD
Re: Wondering why 4 O2 bungs in MAC ORP? You'd be surprised. I plugged all four of my O2's into my custom exhaust with no cats. They were about a foot apart. Didn't throw a code for a month. Then, I got the O2 simms. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />
You can leave the rear O2's to plug the hole when you get the simms, or just get a little bung hole plug to screw in there. You remove the O2 wiring harness, and snap the simms in place.
You can leave the rear O2's to plug the hole when you get the simms, or just get a little bung hole plug to screw in there. You remove the O2 wiring harness, and snap the simms in place.
TECH Apprentice
Joined: Dec 2001
Posts: 357
Likes: 0
From: Whitby Ont Canada
Re: Wondering why 4 O2 bungs in MAC ORP? I just bought plugs at the GM parts counter for the pipes and plugged the simms into the rear O2 harness. I prefer to have them come on the ORP for later weld in of cats and then there is no need to play around with the bungs later, it's easy enough to plug them up. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
