******10 MPG caused by what? Update******** - 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 04-24-2007, 08:05 AM   #11
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The new o2 might be bad. Put your old one back in and burn a tank and see.
Yes the FPR needs a smaller line.
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Old 04-24-2007, 12:18 PM   #12
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I changed the o2 sensor again and its the same outcome, is there anything that can throw the o2 sensor out of whack? My only other thing to turn to is my bootleg air filter.
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Old 04-24-2007, 12:22 PM   #13
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What color is the tip of the O2 when you pulled it out? White is a lean condition and excessive caked on black soot is rich. It should be right in between both of those.
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Old 04-24-2007, 12:29 PM   #14
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Throw the O2 off? Sure. A plug wire touching the O2 harness.
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Old 04-25-2007, 12:12 AM   #15
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its normal, I also changed my oil and used injection cleaner. The cleaner helped a little, but my mpg still isn't 20 at least. Gas here is $3.05. I put $20 and get 100-115 miles. Could it be a faulty knock sensor? Also, most of the time when I m doing 50 mph and let off the accelerator the car slows down a little more than what it suppose to. It feels like I'm not getting enough air through my air filter. This is way I started to think its my air filter.
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Old 04-25-2007, 12:21 AM   #16
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You say it slows down a bit more than it should. Are you sure your brakes are not dragging?
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Old 04-25-2007, 01:14 PM   #17
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I was thinking that too. If the 2 bolts that hold the caliper could make them drag then this would be best and next place I'll look. My 2 bolts in both calipers were stuck and real hard to get out. I got it out but I couldn't get the rubber boot out to grease it up so I just c-clamped the bolts back into the calipers.
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Old 04-25-2007, 01:48 PM   #18
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If you had to force the bolts in...that might be a good place to start.
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Old 04-25-2007, 02:06 PM   #19
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Quote:
Originally Posted by trigga_b
Could it be a faulty knock sensor?
No. Not even a remote possibility.
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Old 04-25-2007, 02:13 PM   #20
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What would you suggest to getting those dried up rubber boots out?
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