A bunch of hot air - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**dec010974** · 12-19-2016, 09:10 PM

Hello to all. I need help with my LSx o2 sensors. As I look at the scan gauge on my LSx swap, I noticed that my O2 sensors aren't responding to the PCM. My exhaust Is open due to the fact that I was rejected by the muffler shop due to leaking gas from the fuel sending unit. The loose AN fittings was tightened, fixed. Is there any reason why the 02 sensors are dead? I would hate to buy new sensors and not Resolve the issue. Thanks in advance, Clark. I did the harness myself.

Big Port Jimmy 6 · 12-19-2016, 11:16 PM

How close to the open end of the exhaust? I wouldn't worry much till the pipes are on.

izzy_Britton · 12-20-2016, 02:00 AM

are you sure that you didnt program the o2 sensors out of the computer?

I ask because when i had my computer re-programmed i had the aft o2 sensors removed as emissions compliance is not necessary.

-Izzy

**dec010974** · 12-20-2016, 10:20 AM

Big port jimmy 6, the 02 sensors are very close to the end of the open exhaust. Also the tuner stated that the 02 sensors aren't responding. Izzy Briton, I'm referencing the front o2 sensors. The rear sensor will be removed from the tune.

**Hart_Rod** · 12-20-2016, 11:02 AM

Why do you think they are dead?

**dec010974** · 12-20-2016, 06:30 PM

Hart_rod, the scan tool has a listing/display that shows the activity of the o2 sensors of live data. While the engine is running, The data or activity of the o2 sensors Will be bouncing around, calibrating itself as the engine runs. I was told that the o2 sensors activity, ranges from 5 thru 450, which means rich or lean as the pcm interpret this info. I may have left out a thing or two but the geeks will know what I'm talking about. You gotta love the smart guys. They built this country. In my case, the o2 sensors show this symbol (-). This symbol - is not a number from 5 thru 450. That's why I say the o2 sensors aren't responding. I'll check in the morning. The exhaust was installed today.

BR3W CITY · 12-20-2016, 07:52 PM

Are they stock 02 sensors? The ( - ) means its not getting ANY signal from the 02. Any chance you've got em wired wrong?

**dec010974** · 12-20-2016, 08:40 PM

Brew city, I am offended. Me, wire the o2 sensor wrong? Brew, I never. Lol, I used GM schematics while fabbing up the wire harness. I did change from the square sensors to the flat o2 sensors. The wiring is as follows d-ignition, c-harness ground, b-#66 or#69 pcm, a-#26 or #29 pcm. What's next brew?

BR3W CITY · 12-20-2016, 10:32 PM

Check the fuse panel. They can pop the Engine Sensor Fuse, 10a

clinebarger · 12-20-2016, 11:53 PM

It should display a Voltage Value, Unplugging the O2's should yield close to 450 MV (Open Circuit).

**dec010974** · 12-21-2016, 08:42 AM

Brew, it can't be that easy as just exchanging a fuse. Hard is the story of my life. Cline I'll check the millivolts. I will also check the continuety of each wire and unplug/plug each 02 sensor. Thanks Fam. I'll post the results.

**Hart_Rod** · 12-21-2016, 08:49 AM

Quote:

Originally Posted by dec010974

Brew, it can't be that easy as just exchanging a fuse. Hard is the story of my life. Cline I'll check the millivolts. I will also check the continuety of each wire and unplug/plug each 02 sensor. Thanks Fam. I'll post the results.

I'm assuming you are getting a check engine light or no?

**dec010974** · 12-21-2016, 02:06 PM

Alright boys and girls. I unplugged the o2 sensors, then plugged them back up prior to start up. I cranked the Motor and plugged up scan gauge. I saw 3 codes that deal mass air flow. I'm running a speed density tune. The o2 sensors are responding. They read around around .445 as clone stated. Clinebarger wins the prize. Thanks my c10 family. Happy holidays. The tune will come and adjust my tune now that The exhaust is buttoned up.

**Hart_Rod** · 12-21-2016, 02:24 PM

Quote:

Originally Posted by dec010974

Alright boys and girls. I unplugged the o2 sensors, then plugged them back up prior to start up. I cranked the Motor and plugged up scan gauge. I saw 3 codes that deal mass air flow. I'm running a speed density tune. The o2 sensors are responding. They read around around .445 as clone stated. Clinebarger wins the prize. Thanks my c10 family. Happy holidays. The tune will come and adjust my tune now that The exhaust is buttoned up.

So there was nothing wrong

davepl · 12-21-2016, 02:58 PM

You might want to try in the LS section:

http://67-72chevytrucks.com/vboard/f...play.php?f=206

**dec010974** · 12-21-2016, 08:32 PM

This is the LSx section. @ hart Rod, I guess I'm lucky. There was nothing to fix. The sun does shine on a dogs azz, sometimes.
Thanks again Fam.

12-19-2016, 09:10 PM	#1
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 959	A bunch of hot air Hello to all. I need help with my LSx o2 sensors. As I look at the scan gauge on my LSx swap, I noticed that my O2 sensors aren't responding to the PCM. My exhaust Is open due to the fact that I was rejected by the muffler shop due to leaking gas from the fuel sending unit. The loose AN fittings was tightened, fixed. Is there any reason why the 02 sensors are dead? I would hate to buy new sensors and not Resolve the issue. Thanks in advance, Clark. I did the harness myself.

12-20-2016, 02:00 AM	#3
izzy_Britton Registered User Join Date: Apr 2013 Location: Nor-Cal Posts: 632	Re: A bunch of hot air are you sure that you didnt program the o2 sensors out of the computer? I ask because when i had my computer re-programmed i had the aft o2 sensors removed as emissions compliance is not necessary. -Izzy __________________ WHO_DCTC - Wifes 05 Z-71 Build - Now defunct as she decided she wants an Escalade too Cream Puff - LS'd Square - Slow going on the back burner Tripple Threat - 3 Wrecks for the price of one build thread Project Delongdium - Step-Sons Plastic Clad 2003 Avalanche - DONE and Delivered.

12-20-2016, 10:20 AM	#4
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 959	Re: A bunch of hot air Big port jimmy 6, the 02 sensors are very close to the end of the open exhaust. Also the tuner stated that the 02 sensors aren't responding. Izzy Briton, I'm referencing the front o2 sensors. The rear sensor will be removed from the tune.

12-20-2016, 11:02 AM	#5
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,858	Re: A bunch of hot air Why do you think they are dead? __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

12-20-2016, 07:52 PM	#7
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: A bunch of hot air Are they stock 02 sensors? The ( - ) means its not getting ANY signal from the 02. Any chance you've got em wired wrong? __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

12-19-2016, 11:16 PM	#2
Big Port Jimmy 6 Addicted to Rust Join Date: Dec 2009 Location: Abbeville SC Posts: 1,030	Re: A bunch of hot air How close to the open end of the exhaust? I wouldn't worry much till the pipes are on. __________________ Current trucks: (48 GMC100 320 inliner) Gone (48 Suburban in pieces) Sold 87 GMC CCSB 5.3 4l60E Daily Driver ECTA National record holder XO/PP We never really grow up, we just learn how to act in public.

12-20-2016, 06:30 PM	#6
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 959	Re: A bunch of hot air Hart_rod, the scan tool has a listing/display that shows the activity of the o2 sensors of live data. While the engine is running, The data or activity of the o2 sensors Will be bouncing around, calibrating itself as the engine runs. I was told that the o2 sensors activity, ranges from 5 thru 450, which means rich or lean as the pcm interpret this info. I may have left out a thing or two but the geeks will know what I'm talking about. You gotta love the smart guys. They built this country. In my case, the o2 sensors show this symbol (-). This symbol - is not a number from 5 thru 450. That's why I say the o2 sensors aren't responding. I'll check in the morning. The exhaust was installed today.

12-20-2016, 08:40 PM	#8
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 959	Re: A bunch of hot air Brew city, I am offended. Me, wire the o2 sensor wrong? Brew, I never. Lol, I used GM schematics while fabbing up the wire harness. I did change from the square sensors to the flat o2 sensors. The wiring is as follows d-ignition, c-harness ground, b-#66 or#69 pcm, a-#26 or #29 pcm. What's next brew? Last edited by dec010974; 12-20-2016 at 08:52 PM.

12-20-2016, 10:32 PM	#9
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: A bunch of hot air Check the fuse panel. They can pop the Engine Sensor Fuse, 10a __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

12-20-2016, 11:53 PM	#10
clinebarger Senior Member Join Date: May 2009 Location: Fort Worth, TX Posts: 6,370	Re: A bunch of hot air It should display a Voltage Value, Unplugging the O2's should yield close to 450 MV (Open Circuit).

12-21-2016, 08:42 AM	#11
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 959	Re: A bunch of hot air Brew, it can't be that easy as just exchanging a fuse. Hard is the story of my life. Cline I'll check the millivolts. I will also check the continuety of each wire and unplug/plug each 02 sensor. Thanks Fam. I'll post the results.

12-21-2016, 02:06 PM	#13
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 959	Re: A bunch of hot air Alright boys and girls. I unplugged the o2 sensors, then plugged them back up prior to start up. I cranked the Motor and plugged up scan gauge. I saw 3 codes that deal mass air flow. I'm running a speed density tune. The o2 sensors are responding. They read around around .445 as clone stated. Clinebarger wins the prize. Thanks my c10 family. Happy holidays. The tune will come and adjust my tune now that The exhaust is buttoned up.

12-21-2016, 02:58 PM	#15
davepl Registered User Join Date: Aug 2006 Location: Redmond, WA Posts: 6,332	Re: A bunch of hot air You might want to try in the LS section: http://67-72chevytrucks.com/vboard/f...play.php?f=206 __________________ 1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible

12-21-2016, 08:32 PM	#16
dec010974 Senior Member Join Date: Oct 2012 Location: Miami, Florida Posts: 959	Re: A bunch of hot air This is the LSx section. @ hart Rod, I guess I'm lucky. There was nothing to fix. The sun does shine on a dogs azz, sometimes. Thanks again Fam.



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