Oxygen sensor bad if SES light isn't on? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-06-2007, 03:25 PM   #11
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Thanks to all of you for your help with this. I just ordered the Denso "front" unit from Rock Auto with the discount. The discount was good for $2, but every bit helps! I chose three day express service, so we will see what happens when it gets here. I'm crossing my fingers that the sensor will help increase my mpgs by like 4-5 mpg. I plan on installing this sensor, changing the fuel filter, and gutting the airbox to see what kind of mileage gains I get.
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Old 12-06-2007, 04:51 PM   #12
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When you get it in there let us know how it goes..

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Old 12-06-2007, 07:56 PM   #13
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Oops yeah that didn't make sense. I'll clarify:

My o2 was NOT tripping a light, but I changed it anyway. Sorry.
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Old 12-06-2007, 08:28 PM   #14
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In addition to the maintenance items already mentioned, you should check all the vacuum lines and fittings. I thought I replaced all mine when I got the car, but I missed one and was only getting mileage like yours. After I found and fixed the vacuum leak, I got 37 mpg on the highway the last time I checked.
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Old 12-07-2007, 10:47 AM   #15
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Bastard,
I pulled the engine cover to check some of the vacuum lines, and found that two were cracked. I replaced them and I think I it made a little bit of a difference. Since this engine is new, you can be sure that one line is possibly messed up. I am posting a reply to your idea because I think its going to be very difficult to fix a vacuum leak seeing as I can't see air leaking. I tried the whole carb cleaner spray thing on my old car, but it did absolutely nothing. We'll see what this does. As of right now I filled up the tank to right where it said "F" on the guage, and it is now a shade above half a tank on the guage and i have put 60 miles on my car. This has to stop haha.
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Old 12-07-2007, 03:21 PM   #16
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Wow.... That car is really eating through Fuel

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Old 12-07-2007, 03:26 PM   #17
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Quote:
Originally Posted by Tuffguy610
I pulled the engine cover to check some of the vacuum lines, and found that two were cracked. I am posting a reply to your idea because I think its going to be very difficult to fix a vacuum leak seeing as I can't see air leaking.
The ability to see air is not necessary to diagnose a failed vacuum hose. You already found two cracked vacuum lines, so it is reasonable to expect that there are more. Vacuum tubing is pretty inexpensive, I have found it best to replace all the rubber vacuum lines on a car when I find there are some that have deteriorated. I have also replaced several of the rubber 90 degree vacuum fittings because they tend to crack and leak too.
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Old 12-07-2007, 03:35 PM   #18
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I'm curious about the current O2 sensor. I wonder if something happened to it when it was in the other engine. Wonder if the old engine was eating antifreeze and coated the sensor. I seem to remember something about this from a previous post. hope the new sensor is the answer for you
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Old 12-07-2007, 03:47 PM   #19
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Quote:
Originally Posted by Tuffguy610
Bastard,
I pulled the engine cover to check some of the vacuum lines, and found that two were cracked. I replaced them and I think I it made a little bit of a difference. Since this engine is new, you can be sure that one line is possibly messed up. I am posting a reply to your idea because I think its going to be very difficult to fix a vacuum leak seeing as I can't see air leaking. I tried the whole carb cleaner spray thing on my old car, but it did absolutely nothing. We'll see what this does. As of right now I filled up the tank to right where it said "F" on the guage, and it is now a shade above half a tank on the guage and i have put 60 miles on my car. This has to stop haha.

All City Driving... Lots O Stop and go... I filled it till the Pump stopped... Was a bit above the F for me..
Right nw my guess is 19-20mpg

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Old 12-12-2007, 10:54 AM   #20
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I just put the Denso unit in. I also gutted my airbox. The fuel filter will be done sometime next week. The old sensor didn't look like it was sooted or anything, it looked like it was in decent shape, but I suppose that might not mean too much. I suspect it was a bosch unit, it had three slits in the entire circumference of the sensor area. I believe thats what it looked like on the website to purchase the unit. It is my understanding that I will notice a difference after a few days of driving when the computer recognizes the new inputs and finally makes the changes to the fuel delivery.
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