98 chev 02 censor 5.7 vortec

john v54 · 06-29-2005, 05:34 AM

Last month my check engine light lit up and as a result I had two o2 sensors changed at the local shop.Same problem again with sensors only a month later.
Is this a common problem or did I get bad parts? They checked the cataletyc converter for back preasure and all was good there. Ther is about 130000 kms on the engine and Its in good shape too. Any Ideas out there?

vanhal · 10-08-2005, 08:12 PM

I have had the same problem with my 98 5.7 comming home from florida to canada last spring checked it out when i got home and my converters where burned out there was nothing inside it at all. but on a new set and it has been great i get 12 miles per gal pulling a 25ft, trailer
take care ......pete

72'CaminoKid · 10-09-2005, 11:45 AM

my dad had a similar problem with his 96 silverado 4.3 L ,vortec i believe, his also turned out to be the cats...

chevyguy · 10-09-2005, 11:26 PM

You have 4 o2 sensors, Is it the same 2 or the other 2?

72'CaminoKid · 10-10-2005, 06:52 AM

not only is it the same ones, but which ones? knowing where they are can be a geat help in out trouble shooting

chevyguy · 10-10-2005, 09:58 AM

HUH? Why do you say this camino kid? What is your thought on which ones to help in troubleshooting?

72'CaminoKid · 10-10-2005, 10:51 AM

there are 4 sensors, one on each manifold ( one from left side of engine, one from right), one sensor where the 2 manifolds come together before the cat, and one right after the cat. depending on which sensors are messing up or taking bad readings, could tell us where the problem lies..... is it the cat, or somethin in the engine and which side. just my ideas and opinions

chevyguy · 10-10-2005, 01:34 PM

Umm 1997 had 4 ,2 on each side both before the cat, Neither on the manifold. Did they change on 1998? I will have to look tonight and see.

wojeepster · 11-23-2005, 06:29 PM

the closet o2 sensor to the engine is the one that feeds info to the ecu to modify the mixture. the second 02 sensor just monitors the cat.

Truck_Man · 11-24-2005, 07:59 AM

Quote:

Originally Posted by vanhal

I have had the same problem with my 98 5.7 comming home from florida to canada last spring checked it out when i got home and my converters where burned out there was nothing inside it at all. but on a new set and it has been great i get 12 miles per gal pulling a 25ft, trailer
take care ......pete

normally the only way you will have problems with cats is if they are pluged, you can actually gut them on most vehicles, however this is illegal so I dont advise doing it. All cats are for is pollution control. Dont gut them though, If you get caught you can get a heavy fine.

06-29-2005, 05:34 AM	#1
john v54 Junior Member Join Date: Jun 2005 Posts: 1	98 chev 02 censor 5.7 vortec Last month my check engine light lit up and as a result I had two o2 sensors changed at the local shop.Same problem again with sensors only a month later. Is this a common problem or did I get bad parts? They checked the cataletyc converter for back preasure and all was good there. Ther is about 130000 kms on the engine and Its in good shape too. Any Ideas out there?

10-08-2005, 08:12 PM	#2
vanhal Senior Member Join Date: Mar 2005 Location: ontario, canada Posts: 102	o2 censors I have had the same problem with my 98 5.7 comming home from florida to canada last spring checked it out when i got home and my converters where burned out there was nothing inside it at all. but on a new set and it has been great i get 12 miles per gal pulling a 25ft, trailer take care ......pete

10-09-2005, 11:45 AM	#3
72'CaminoKid Senior Member Join Date: Jun 2005 Posts: 2,268	my dad had a similar problem with his 96 silverado 4.3 L ,vortec i believe, his also turned out to be the cats... __________________ 99 suburban xlt 96 silverado 91 wrangler (my baby ) 08 Honday shadow 750 (my mistress)

10-09-2005, 11:26 PM	#4
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,160	You have 4 o2 sensors, Is it the same 2 or the other 2? __________________ When i die, i dont want to walk gracefully thu the pearly gates and turn in a unused body. i want to go sliding thru sideways and turn in a body that has been completely used up.

10-10-2005, 06:52 AM	#5
72'CaminoKid Senior Member Join Date: Jun 2005 Posts: 2,268	not only is it the same ones, but which ones? knowing where they are can be a geat help in out trouble shooting __________________ 99 suburban xlt 96 silverado 91 wrangler (my baby ) 08 Honday shadow 750 (my mistress)

10-10-2005, 09:58 AM	#6
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,160	HUH? Why do you say this camino kid? What is your thought on which ones to help in troubleshooting? __________________ When i die, i dont want to walk gracefully thu the pearly gates and turn in a unused body. i want to go sliding thru sideways and turn in a body that has been completely used up.

10-10-2005, 10:51 AM	#7
72'CaminoKid Senior Member Join Date: Jun 2005 Posts: 2,268	there are 4 sensors, one on each manifold ( one from left side of engine, one from right), one sensor where the 2 manifolds come together before the cat, and one right after the cat. depending on which sensors are messing up or taking bad readings, could tell us where the problem lies..... is it the cat, or somethin in the engine and which side. just my ideas and opinions __________________ 99 suburban xlt 96 silverado 91 wrangler (my baby ) 08 Honday shadow 750 (my mistress)

10-10-2005, 01:34 PM	#8
chevyguy Senior Member Join Date: Sep 2005 Location: ALABAMA Posts: 3,160	Umm 1997 had 4 ,2 on each side both before the cat, Neither on the manifold. Did they change on 1998? I will have to look tonight and see. __________________ When i die, i dont want to walk gracefully thu the pearly gates and turn in a unused body. i want to go sliding thru sideways and turn in a body that has been completely used up.

11-23-2005, 06:29 PM	#9
wojeepster Senior Member Join Date: Nov 2005 Posts: 89	the closet o2 sensor to the engine is the one that feeds info to the ecu to modify the mixture. the second 02 sensor just monitors the cat.

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