O2 sensor help. PLEASE!!!
Thread Starter
Instructor
Joined: May 2014
Posts: 106
Likes: 0
From: Miami FL
O2 sensor help. PLEASE!!!
Car is a C5Z06 with LG street headers. I am using only the front O2 sensors. I used the original rears with the connections from the LG headers. The car kept throwing P0134, 133,154,160 all that stuff. lol. I found out that fuse #15 had blown out and i replaced it. The car has been running very rich and now does not throw the engine light but when i run through the codes they still pop up as current. When i tuned the car my tuner told me he wasn't able to do a street tune because the car wasn't picking up the sensors but he was able to tune the wide open throttle on the dyno for max power. The car is driving poorly. Its not bucking but i can defiantly tell its running very rich from the smell and because of the power loss during regular driving. I don't want to take it to a shop for something s dumb as O2 sensor. Please help me out guys. Side not the rear sensor connections have been fried by the headers. lol
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
The O2 sensors should be plugged into the flat plug on each side, and they should be plugged into the same side, i.e., driver's side O2 to driver's side plug and passenger side O2 to passenger side plug. With LG headers they are easy to reverse since the sensors are installed at an angle.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Welcome to long tube headers !! The inherent problem with LT's is that they have to move the front 02 bungs back as much as 2-3 feet---This makes the 02's not heat up correctly and give erroneous 02 readings-- 02's typically only last 2-3 years
Moving the rears to the front is a helper--as you've already done that
However there is NO 100% fix of this issue--Tht's why LT's are illegal in many states
The end result is exactly as you describe----The P/T fuel become very rich
A tuner can do a few things to help like lowering the 02 switching points from.450 to a much lower .300 or so---again not a 100% fix but helps---
PS: You can check the operation of your 02's with most any handheld scanner that reads live data---A properly working 02 will bounce around voltages VERY rapidly from .150 millivolts to .950 millivolts -Check to see if they are oscillating rapidly
A DEAD 02 will flatline at .450 millivolts---Also once an 02 gets fouled--it's junk !!
Moving the rears to the front is a helper--as you've already done that
However there is NO 100% fix of this issue--Tht's why LT's are illegal in many states
The end result is exactly as you describe----The P/T fuel become very rich
A tuner can do a few things to help like lowering the 02 switching points from.450 to a much lower .300 or so---again not a 100% fix but helps---
PS: You can check the operation of your 02's with most any handheld scanner that reads live data---A properly working 02 will bounce around voltages VERY rapidly from .150 millivolts to .950 millivolts -Check to see if they are oscillating rapidly
A DEAD 02 will flatline at .450 millivolts---Also once an 02 gets fouled--it's junk !!
