o2 sensors
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Joined: Mar 2001
Posts: 53
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From: Michigan City in
o2 sensors
I gutted out the cats about a year ago and when I did I hit the oxygen sensors. I bought new bosch sensors and I've had to replace them about five times in the last year. Is this because of the converters or am I getting bad sensors.
Does anone know where to buy the sensors cheaply.
Now I'm paying about 60 dollars apiece for them.
Does anone know where to buy the sensors cheaply.
Now I'm paying about 60 dollars apiece for them.
Le Mans Master
Joined: Oct 1999
Posts: 9,713
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From: Sachse Texas
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Re: o2 sensors (94-LT1)
Sounds like you may be running too rich because of the gutted cats and it is fouling the O2 sensors. Jeff is da'man for parts, I thnk he sells them for about $38 a piece.
You may want to invest in an adjustable fuel pressure regulator to trn the pressure down a hair. It will generally run the richest when you first start the car in the mornings and it is going off of standard fuel charts. Once it goes to closed loop, it will adjust the fuel and spark accordingly.
You may want to invest in an adjustable fuel pressure regulator to trn the pressure down a hair. It will generally run the richest when you first start the car in the mornings and it is going off of standard fuel charts. Once it goes to closed loop, it will adjust the fuel and spark accordingly.
Drifting
Joined: Jun 2001
Posts: 1,997
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From: Lake Ozark MO
Re: o2 sensors (94-LT1)
O2s are pretty tolerant of rich conditions. You'd have to be running obviously rich and really loading up the O2s with carbon before they'd quit. They are not tolerant of non-sensor safe sealants and cheap Octane booster type products and other gasoline additives.
My brother made the mistake of adding some cheap octane booster which quickly fouled his O2s. Not realizing the problem he quickly lost the next set of new O2s since he was running on the same tank of gasoline. I'd imagine the use of some non-sensor safe sealants would have a similar effects.
Gutted cats won't affect the O2s unless you've physically damaged them. The added air flow through the engine would be compensated for by the O2s themselves. Even if they didn't compensate, the engine would run leaner instead of richer.
The other suspect would be a bad connection or wiring. If you've not used additives or used any type of sealant that could make it's way into the exhaust system (such as on the intake) then I'd be shooting for an electrical problem.
My brother made the mistake of adding some cheap octane booster which quickly fouled his O2s. Not realizing the problem he quickly lost the next set of new O2s since he was running on the same tank of gasoline. I'd imagine the use of some non-sensor safe sealants would have a similar effects.
Gutted cats won't affect the O2s unless you've physically damaged them. The added air flow through the engine would be compensated for by the O2s themselves. Even if they didn't compensate, the engine would run leaner instead of richer.
The other suspect would be a bad connection or wiring. If you've not used additives or used any type of sealant that could make it's way into the exhaust system (such as on the intake) then I'd be shooting for an electrical problem.
Race Director
Joined: Sep 2000
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From: The Top of Utah
Re: o2 sensors (94-LT1)
I am not that familiar with your '94, but 02's are in front of the cat. They are there to sense the situation and allow the ECM to adjust the fuel mixture. Only O2's behind the the cats would be affected by cat removal or modifications. Is this what you are refering to? I don't believe those "after" O2's affect the operation of the car. I also believe there are "foolers" available to replace those O2's or insert into the harness to kill the "check" or "service" light. Good luck, and...
RACEON!!!
RACEON!!!
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Joined: Mar 2001
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From: Michigan City in
Re: o2 sensors (CFI-EFI)
There is one sensor on the pass side that is after the cat. that is why I thought the converters might be part of the problem. the bosch sensors i got were from Autozone. $55 each
Instructor
Joined: Oct 2002
Posts: 135
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From: Pitman NJ
Re: o2 sensors (94-LT1)
I've got a gutted set of cats that I use on my 94'. I have to use a "good" set to pass emissions, empty ones WILL cause your car to run rich and emission gases will go off the charts. The gutted cats are worth 2/10's in the 1/4 mile with that being the only change to my exhaust system. The O2 sensor does it's job by checking exhaust temp. They give a voltage reading depending how hot they are. I forget at this late hour what the reading are but you can check your O2 sensors by pulling them from the car & putting a meter on them then hitting them with a propane torch. If you see a voltage change they are good.The "after" O2 sensor is a watch dog sensor. It looks for a lower temp showing that the cats are doing they job. I have not tried the fooler O2 sensor replacement yet. I'll try that this summer.
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Joined: Feb 2000
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From: Woodbridge VA
Re: o2 sensors (ld85)
I have an obdII system so not exactly sure if things are the same, but I was getting o2 sensor codes. I changed the sensors and the code kept coming back. After following the wiring chart, I realized that there was a fuse for the sensors. The fuse was blown. Replaced the fuse and things have been fine. Probably bought a couple of sensors I really didn't need.
ZZZASY
'96 LT4
ZZZASY
'96 LT4
Drifting
Joined: Jun 2001
Posts: 1,997
Likes: 1
From: Lake Ozark MO
Re: o2 sensors (JDANNER)
The O2 sensor does it's job by checking exhaust temp. They give a voltage reading depending how hot they are.
Here's some good reading.... http://www.delphion.com/details?pn=US05518603__