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?? Resistor to replace Oxygen Sensor ??
Thread Starter
Tech Contributor
Joined: Oct 2004
Posts: 1,170
Likes: 6
From: Watkins Glen NY
?? Resistor to replace Oxygen Sensor ??
We are told that one may replace the secondary Oxygen Sensor on a 1995 LT1, with a custom-made resistor, which makes engine management think the catalytic converters are still there, and functioning fine.
If this is true, where would we purchase such a device?
Thanks,
Ed LoPresti
If this is true, where would we purchase such a device?
Thanks,
Ed LoPresti
Drifting
Joined: Dec 2005
Posts: 1,313
Likes: 2
From: High Ridge Missouri
Better just to program it out
02 sims are becoming more difficult to locate, not technically legal to sell in the USA anymore (many online sources with schematics to build your own though)
02 sims are becoming more difficult to locate, not technically legal to sell in the USA anymore (many online sources with schematics to build your own though)
Race Director
Joined: Feb 2001
Posts: 13,911
Likes: 101
From: Manassas VA
NoVa Events Coordinator
St. Jude Donor '14
It's not a resistor but electronics that varies the voltage.... If that makes sense. With the sims connected, 1996 odb2 cars ONLY, u can see the voltage vary with a scanner, hence the name O2 simulator...
1995 only has two o2 sensors, one for each bank, so I don't understand what u are trying to do. The are no post cat O2 sensors..
1995 only has two o2 sensors, one for each bank, so I don't understand what u are trying to do. The are no post cat O2 sensors..
Burning Brakes
Joined: Nov 2006
Posts: 1,102
Likes: 1
From: Portsmouth Virginia 396LT4 435RWHP/400RWTQ Best so far 11.26 @ 123mph
Ed,
The rear passenger O2 sensor on 94/95 OBD1 vettes only can be removed without any code being set. They are basically useless.Only the 96 w/true OBD2 and 2 rear O2 sensors requires simulators or tuning them out. You can use the rear O2 on yours as a spare if needed up front. So you don't need a resistor either. Just tape up the connector and stick it out of the way.
The rear passenger O2 sensor on 94/95 OBD1 vettes only can be removed without any code being set. They are basically useless.Only the 96 w/true OBD2 and 2 rear O2 sensors requires simulators or tuning them out. You can use the rear O2 on yours as a spare if needed up front. So you don't need a resistor either. Just tape up the connector and stick it out of the way.
Last edited by PDQUIK95; Apr 27, 2011 at 07:13 AM. Reason: add
Thread Starter
Tech Contributor
Joined: Oct 2004
Posts: 1,170
Likes: 6
From: Watkins Glen NY
Yours was the first explanation I have understood, on why we could not just place a resistor on the end of the wire. Thank you!
Our particular 1995 does, in fact, have what appears to be a secondary oxygen sensor "downstream" of the primary on only one of the street pipes. It is aft of the cat. I see Rick, who posted after you, knows about this, also.
----------------------------
Rick,
Your solution is my favorite type - simple AND inexpensive! So we simply remove that secondary O2 sensor, and tape up the wire? (He asked in disbelief . . . . .)
Thank you, Gentlemen!
Ed
Race Director
Joined: Jan 2002
Posts: 12,263
Likes: 86
From: O'Fallon Missouri
Ed,
The rear passenger O2 sensor on 94/95 OBD1 vettes only can be removed without any code being set. They are basically useless.Only the 96 w/true OBD2 and 2 rear O2 sensors requires simulators or tuning them out. You can use the rear O2 on yours as a spare if needed up front. So you don't need a resistor either. Just tape up the connector and stick it out of the way.
The rear passenger O2 sensor on 94/95 OBD1 vettes only can be removed without any code being set. They are basically useless.Only the 96 w/true OBD2 and 2 rear O2 sensors requires simulators or tuning them out. You can use the rear O2 on yours as a spare if needed up front. So you don't need a resistor either. Just tape up the connector and stick it out of the way.
x2
Burning Brakes
Joined: Nov 2006
Posts: 1,102
Likes: 1
From: Portsmouth Virginia 396LT4 435RWHP/400RWTQ Best so far 11.26 @ 123mph
So we simply remove that secondary O2 sensor, and tape up the wire? (He asked in disbelief . . . . .)
Ed[/QUOTE]
That is correct. Ran my previous 94 and my current 95 without the rear sensor for ten years now. I use OBD1 edit software for various changes and tuning so I am very familiar with the right rear sensor not being a factor on the 94/95 OBD1 model. THE 96 OBDII is obviously a different story. You can call TPIS also and ask about it. They will confirm this fact.
RG
Ed[/QUOTE]
That is correct. Ran my previous 94 and my current 95 without the rear sensor for ten years now. I use OBD1 edit software for various changes and tuning so I am very familiar with the right rear sensor not being a factor on the 94/95 OBD1 model. THE 96 OBDII is obviously a different story. You can call TPIS also and ask about it. They will confirm this fact.
RG
Melting Slicks
Joined: Jun 2010
Posts: 2,178
Likes: 1
Did this thread help you before in regards to O2 sensors?
http://forums.corvetteforum.com/c4-t...ong-tubes.html
http://forums.corvetteforum.com/c4-t...ong-tubes.html
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Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
Just a FYI, the resistor thing is to replace a KNOCK sensor to keep the computer from retarding the timing.................4.5K ohms on that one,
but be sure you have the fuel, timing tables, compression, squish area, spark plugs and fuel mixture right or bye bye piston.
but be sure you have the fuel, timing tables, compression, squish area, spark plugs and fuel mixture right or bye bye piston.
Last edited by coupeguy2001; Apr 28, 2011 at 01:17 AM.
Thread Starter
Tech Contributor
Joined: Oct 2004
Posts: 1,170
Likes: 6
From: Watkins Glen NY
Thank you!
I do not doubt your findings. I am simply amazed that the solution is that simple.
---------------------------------
Charleston,
That thread of ours helped my understanding, AND was confusing! In retrospect, most of the confusion was our fault, because I did not immediately specify the year of our car. Nevertheless, anyone can readily see lots of conflicting opinions and contradictory advice. Also, most just assumed that we had the software, and the knowledge, to simply reconfigure the mappings. As I mentioned right in one of the posts there, your advice and observations were most welcome.
-------------------------------
Chris,
You have just recited all the reasons why we are not ready to attempt a “tune” on our own. (Especially the "by by piston" part!) Now, if this were a Weber, or a Holly, then we are on familiar ground.
-
Thank you, everyone. We value everyone's advice, and are simply attempting to sort through the parts that precisely apply to our situation. We finally know exactly how to proceed with the first stage of this.
Ed
