The cars running rich and I'm sure they are original. So should I get AC/Delco O2 sensors or Bosch or ? This is for a 96 LT1 A4.

Thanks,

 

Ive changed mine twice with Napa parts.But what made mine quit running rich was using fuel injection cleaner in the gas tank.

 

I went with Bosch when I swapped mine. Work perfectly and I monitor it with Diacom. I'll bet a Bosch is probably cheaper, too.

Jake





[Modified by JAKE, 12:34 PM 11/4/2001]

 

AC--DELCO :chevy :chevy :chevy :chevy :chevy :chevy

 

at advaced its only 20 more for the delco ... i would get the delco

 

Without trying to explain it (because I never got into O2's that much), a lot of people who burn their own chips found out the Bosch was NOT an ideal replacement sensor and they suggest the Delco. From what I remember, the swinging voltage of the Bosch sensor of 450 mv was not 14.7:1, but who knows...-Matt-

 

Is there a service interval that you should replace the O2 sensors at?

My car has 55,000 miles should I consider replacing them or just let them ride?

Gonzo

 

Nothing lasts forever, and oxygen sensors are no exception. As an oxygen sensor, contaminants from normal combustion and oil ash accumulate on the sensing element. This reduces the sensor 's ability to respond quickly to changes in the air/fuel mixture. The sensor slows down and becomes "sluggish." At the same time, the sensor's output voltage may not be as high as it once was, giving the false impression that the air/fuel mixture is leaner than it actually is. The result can be a richer-than-normal air/fuel mixture under various operating conditions that causes fuel consumption and emissions to rise.

The problem may not be notice right away because the change in performance occurs gradually. But, over time, the situation will get worse, ultimately requiring the sensor to be replaced to restore peak engine performance

According to a study conducted by Sierra Research, Inc., in 1996, oxygen sensor failure is the "single greatest source of excessive emissions for fuel-injected vehicles" and the second most significant cause of high emissions in carbureted engines

To minimize the consequences of normal aging, Bosch recommends oxygen sensor replacement for preventative maintenance at the following intervals:

Unheated O2 sensors on 1976 to early 1990s application: every 30,000 to 50,000 miles.
Heated (1st generation) O2 sensors on mid-1980's to mid-1990's applications: every 60,000 miles.
Heated (2nd generation) O2 sensors on mid-1990s and up applications: every 100,000 miles.
Keeping the sensor fresh may improve fuel economy as much as 10-15% (which can save $100 each year in fuel costs on the average). Keeping the sensor in good operating condition will also minimize exhaust emissions, reduce the risk of costly damage to the catalytic converter, and ensure peak engine performance (no surging or hesitating).

For these reasons, the O2 sensor should be considered a "tune-up" replacement item just like spark plugs, especially on older vehicles (those built before the mid-1990's).

Its your call.

 

There is no service interval for 02 sensors (at least that I am aware of ;) ). I replaced mine at 88,000 miles mainly because I was running rich. I replaced all 3 with new AC Delco parts. The old ones were coated with white powder (not anthrax); now the car runs much better and my gas mileage went up about 1 mpg on average. Ecklers sells them for like $42 each.

Oh, yeah, my emissions were like zero when I got my car inspected last weekend, too, compared to "barley passing" last year...


[Modified by 94vette, 8:48 AM 11/6/2001]

 

Thanks for the common sense answers,
I think I will replace mine before my next emmisions test

Gonzo

 

A question that will benefit the ones of us who have not yet done this:
how many O2 sensors is there and where are they located in each type of C4?

- early L98
- late L98
- LT1
- LT4

Thanks,

ToniH


[Modified by ToniH, 9:04 PM 11/6/2001]

 

On my 94 LT1, there are 3 02 sensors: 1 in front of each pre-cat in the exhaust pipe, and 1 behind the passenger pre-cat. I think you need a 7/8" wrench to get them.

 

One on my 91 L98. Drivers side exhaust manifold. I know. Had to reconnect it after I pulled a code 13. The dealership must have messed with it last time it was in for service.

 

1996 LT1 and LT4 use 4, 2 at the ehaust manifolds and 2 at the cats.

I just need to change the ones at the manifolds. I'll get the AC/Delco ones. Thanks guys :D