Pontiac Firebird 1967-2002 Birds of a feather flock together

O2 sensor issue

Thread Tools
 
Search this Thread
 
Old Nov 24, 2015 | 11:49 AM
  #1  
Steve Cox's Avatar
Thread Starter
Teching In
iTrader: (2)
 
Joined: Nov 2015
Posts: 43
Likes: 0
From: Albuquerque NM
Default O2 sensor issue

2002 WS6 Vert M6

When I drive her HARD I get P0131 P0151, o2 low voltage. Can drive all week with out the codes, go over bumps with no issues.

I am assuming that I have a loose connector or short somewhere.

But being new to the fbody world I am not sure where to start.

Thanks in advance for all of your help
Reply
Old Nov 26, 2015 | 09:33 AM
  #2  
wssix99's Avatar
Save the manuals!
15 Year Member
iTrader: (5)
 
Joined: Dec 2007
Posts: 12,967
Likes: 389
From: Chicago, IL
Default

You have the same problem on both sides of the car, so it wouldn't be a single loose connector. It sounds like a global problem with the engine.

What does "drive her HARD" mean? (I'm almost afraid to ask that.) Does it happen every time you "drive her HARD," or is it just intermittent?
Reply
Old Nov 27, 2015 | 09:02 PM
  #3  
Steve Cox's Avatar
Thread Starter
Teching In
iTrader: (2)
 
Joined: Nov 2015
Posts: 43
Likes: 0
From: Albuquerque NM
Default

Thanks for helping. hard is doing a 1/4 mile full throttle, But not speed shifting or spinning the tires.

It is intermittent. May have found another data point, twice i have heard spark knock right before i shift. Going to check fuel pressure under load tomorrow
Reply
Old Nov 27, 2015 | 11:25 PM
  #4  
wssix99's Avatar
Save the manuals!
15 Year Member
iTrader: (5)
 
Joined: Dec 2007
Posts: 12,967
Likes: 389
From: Chicago, IL
Default

^ That sounds more like it. If you are putting the engine under full load, I'll bet your engine is not getting enough fuel, etc. causing a starved condition that would look like a "bad" sensor because you have the abnormal reading over an extended period of time.

The thing is that the MIL is thrown when the problem is sensed for over two minutes. Maybe your throttle body is sticking all the way open, or something like that?
Reply
Old Nov 30, 2015 | 12:51 PM
  #5  
Steve Cox's Avatar
Thread Starter
Teching In
iTrader: (2)
 
Joined: Nov 2015
Posts: 43
Likes: 0
From: Albuquerque NM
Default

checked fuel pressure, Noticed that I have 0 pressure until cycle the pump. 58 PSI engine off, 53 at idle. I need a longer hose to check it driving.

What is a good high quality pump?
Reply




All times are GMT -5. The time now is 05:01 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE