Those with headers.....
Melting Slicks
Joined: Jan 2005
Posts: 2,604
Likes: 0
From: Phoenix, Arizona
You should PM (username) Lichen. He has the same year C4 w/ virtually the same mods. He initially (after the mods) didn't have the heated .02's but switched to them recently. I guess they made a big difference but we'll let him explain that to ya'.
Last edited by JEFNLSA; May 8, 2006 at 05:10 PM.
Team Owner
Joined: Sep 2003
Posts: 25,295
Likes: 4
From: I'm the walkin dude I can see all of the world...
St. Jude Donor '03
With the LT-1 I definitly had to switch to heated O2s. My suspision is pretty much everyone should switch to heated O2s after a header install. My car ran like crap w/o em.
Le Mans Master
Joined: Feb 1999
Posts: 9,922
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
I think allot of it comes down to how modified it is. Some havent noticed any changes with them, but I know I did, and my motor has a big cam, relatively speaking, and 396 cu inches. It used to smell like gas, unburnt allot, as the car wasnt going into closed loop, which is essential for a good running motor and your health, especially behind me 
Now it runs better, as far as the richness smell is concerned, and it goes into cllosed loop after 2 minutes and stays there.
Now it runs better, as far as the richness smell is concerned, and it goes into cllosed loop after 2 minutes and stays there.
Team Owner
Joined: Sep 2001
Posts: 62,140
Likes: 1,728
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Originally Posted by rickreeves1
I'm curious, how do the heated O2's function? I'm also thinking of doing a header install and no cats. How does it effect open loop, closed loop etc.?
Thanks
Thanks
That makes it go into closed loop sooner, and keeps it in closed loop at idle when its most likely to drop out.
There is no way to tell if you really must use a heated O2 without hooking up a scanner to see if its dropping into open loop, unless you notice a mpg decrease. You can assume that if the bung is further away from the engine than the stocker, t hen you might as well go ahead. Mine didnt need one.
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Thread Starter
Burning Brakes
Joined: Nov 2004
Posts: 1,107
Likes: 0
From: RI
well my car is kind of running like crap. My mechanic wasn't too familiar with heated O2 sensors and thats what I think I need. It almost feels like an engine skip between 1800-2100 rpms. I've tried just about everything..... Removed plugs and wires. Did an engine cylinder balance test to see if it was misfiring and the mechanic said everything looked good. I've just about given up on this and am about to call the dealer..aka..stealer. I would like to find someone who could help me out.
Race Director
Joined: Jun 2001
Posts: 10,956
Likes: 680
From: Marlboro country MA
I just installed LT headers and heated sensors. Don't know what would have happened if I hadn't, but I can state that I'm very pleased with the overall results.
I got the sensors here.
I got the sensors here.
I'll probably use my laptop and TTS when I do finally get some headers to see if I need the heated O2's.
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
Originally Posted by TIMSPEED
I have the Hooker Super Comp's and I have the OEM Bosch O2 sensor, and it works just fine.
BTW: The hooker super comp's put the sensor in the #7 primary tube.
BTW: The hooker super comp's put the sensor in the #7 primary tube.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
In moderate weather with an unheated O2 sensor mounted in SS
headers, my car would go into closed loop after a several minutes
idling. It would stay in closed loop at low speeds but at a
40 - 50 MPH cruise, the sensor cooled enough that it dropped back
out in to open loop.
With a heated sensor, the car promptly goes into closed loop and
stays there.
If you are running in open loop, the engine is operating with a very
constrained set of parameters.
.
headers, my car would go into closed loop after a several minutes
idling. It would stay in closed loop at low speeds but at a
40 - 50 MPH cruise, the sensor cooled enough that it dropped back
out in to open loop.
With a heated sensor, the car promptly goes into closed loop and
stays there.
If you are running in open loop, the engine is operating with a very
constrained set of parameters.
.
Melting Slicks
Joined: Mar 2003
Posts: 2,472
Likes: 0
From: Toronto ONTARIO
Back int he day when i had bolt ons i never had heated o2s. funny though that i swear my car felt like it had 50 more hp when cold or when on the highway. can open loop possibly make this happen?
Team Owner
Joined: May 2002
Posts: 24,337
Likes: 25
From: San Diego , CA Double Yellow DirtBags 1985..Z51..6-speed
Originally Posted by MTVette
I just installed LT headers and heated sensors. Don't know what would have happened if I hadn't, but I can state that I'm very pleased with the overall results.
I got the sensors here.
I got the sensors here.
