6 codes?! Please help!! - 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 03-02-2008, 11:02 AM   #11
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Originally Posted by 3064datazz
sorry for posting in the wrong section :( Well, the car is kinda hit or miss. Its kinda hard to explain. I KNOW it doesnt run right, but it doesn't run terrible. My gas mileage tho, has been suffering. About 15 mpg average. I just did plugs and wires about a month ago. Autolite 606 with professional wires. I'll clear the codes, and clean the grounds as suggested. Any other ideas while I'm out there??
If your milage is down, change your front O2 sensor. You can get a good price at www.rockauto.com Mine was about $48 shipped. Changing it is fairly easy. They shoudl be changed every 40k to 50k, so if yours has never been changed, you should do it.
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Old 03-02-2008, 11:18 AM   #12
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ok cool. Its funny you mention that too, because i went to a local shop here in elgin, and they tested my cat. Said it was fine, but he pointed to what looked like it was a second o2 sensor. It probably is time, i havent changed it since I bought the car like 4 or 5 years ago. So should i change out both sensors or just one?
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Old 03-02-2008, 11:25 AM   #13
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Only change the rear sensor if you have a code for it. It has no effect on how the car runs.

The first one is a different story. It can affect your mileage and performance when it gets tired, and will rarely throw a code.
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Old 03-02-2008, 11:27 AM   #14
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Dont worry about the rear one.
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Old 03-02-2008, 11:31 AM   #15
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my car does feel sluggish at times too. How would I know if its bad? I'm just curious. I'm on rockauto right now, but i dont know which o2 to get. Can I have a little help?? I know to stay away from bosch!
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Old 03-02-2008, 11:52 AM   #16
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Quote:
Originally Posted by 3064datazz
my car does feel sluggish at times too. How would I know if its bad? I'm just curious. I'm on rockauto right now, but i dont know which o2 to get. Can I have a little help?? I know to stay away from bosch!
Delco or Denso are good.
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Old 03-02-2008, 11:55 AM   #17
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General rule of thumb on the O2 replacement is if you know you have 50-60k and your fuel mileage is suffering, or if you don't know how many miles are on it. They start to get tired and run you rich at about that time period.
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Old 03-02-2008, 12:01 PM   #18
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ok well I'm pretty sure its time then! I took the cables off my battery so the codes can clear themselves also. i'll b back out there in a little bit. Another question, would an o2 sensor cause some of these codes? EDIT: before i forget, does anyone have a part number for the o2? its giving me tow and three wire setups and stuff. I just dont want to purchase the wrong one. thanks
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Old 03-02-2008, 12:02 PM   #19
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Maybe one or two, but not all of them. You need to look for vacuum leaks and check fuel pressure.
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Old 03-02-2008, 12:07 PM   #20
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okay. I KNOW i need that T looking vacuum piece that goes to the FPR and TB for sure. Its cracked badly. Is that a dealership item?
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