Running Rich
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TECH Regular
Joined: Jan 2015
Posts: 493
Likes: 2
I'm not sure if anyone else has had the same problem however, when I ran a 160* thermostat untuned my car ran really... REALLY rich and got horrible MPG. My guess would be where the computer is looking for a certain temperature the car was basically running choked and rich.
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TECH Fanatic
Joined: Aug 2008
Posts: 1,740
Likes: 2
From: Nebraska
There's the magic numbers right there.....
You CANNOT use the stock O2 sensors on a '93 with Longtube headers. The stock single wire O2s are non heated and when you move them downstream in the headers, they don't get hot enough to operate correctly. You need to buy 1994 LT1 front O2 sensors and the pigtail wiring and wire them up. They are 4 wire sensors that are heated and will give the ECM better readings. I can't remember the pinout numbers but 1 wire is a keyed 12V source, 1 wire is a ground, and another is the ECM wire that goes to your stock O2 plug. The fourth wire isn't needed.
Search Fastbird93 on here, he has a writeup for this conversion. My car ran soo much better after doing this.
Edit: Found one thread that should help, I should have documented when I did mine.
https://ls1tech.com/forums/lt1-lt4-m...t-headers.html
You CANNOT use the stock O2 sensors on a '93 with Longtube headers. The stock single wire O2s are non heated and when you move them downstream in the headers, they don't get hot enough to operate correctly. You need to buy 1994 LT1 front O2 sensors and the pigtail wiring and wire them up. They are 4 wire sensors that are heated and will give the ECM better readings. I can't remember the pinout numbers but 1 wire is a keyed 12V source, 1 wire is a ground, and another is the ECM wire that goes to your stock O2 plug. The fourth wire isn't needed.
Search Fastbird93 on here, he has a writeup for this conversion. My car ran soo much better after doing this.
Edit: Found one thread that should help, I should have documented when I did mine.
https://ls1tech.com/forums/lt1-lt4-m...t-headers.html
Last edited by 93M6Formula; Feb 23, 2015 at 12:48 PM.