effieiency problems - 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 06-21-2005, 09:09 PM   #11
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Quote:
Originally Posted by BillBost37
I've said it before and I'll say it again. The only thing that whines louder than our SUPERCHARGERS are the people that don't have them.

* Runs of to sob like a boy that lost his toy *

<---- Have SC envy here Still like My L36 tho....


My best guess for the bad effiency is going to be the O2 sensor.... Usually when the MPG'* suddenly start to tumble off the sensor is slowing.... I was doing as bad a 14mpg when mine failed, and I wasn't even flooring it...

Normal is 18-21 in town for me depending on the amount of pedal pounding I do...

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Old 06-21-2005, 09:23 PM   #12
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Quote:
Originally Posted by BillBost37
I've said it before and I'll say it again. The only thing that whines louder than our SUPERCHARGERS are the people that don't have them.

Remember the germans will make your bonne AND bill whine
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Old 06-21-2005, 11:30 PM   #13
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Originally Posted by BillBost37
I've said it before and I'll say it again. The only thing that whines louder than our SUPERCHARGERS are the people that don't have them.

Remember the germans will make your bonne AND bill whine
Hmmm when is Daddy gonna let you borrow the car again?
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Old 06-21-2005, 11:34 PM   #14
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I'd take a good look at the plugs and wires also.
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Old 06-22-2005, 01:16 AM   #15
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Quote:
Originally Posted by LakevilleSSEi
I'd take a good look at the plugs and wires also.
they were replaced about 15,000 miles ago. So they shouldn't be too bad. I'll look over the wires and wait to pull the plugs if the O2 sensor doesn't fix the mpg drop.
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Old 06-22-2005, 09:27 AM   #16
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Quote:
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Quote:
Originally Posted by LakevilleSSEi
I'd take a good look at the plugs and wires also.
they were replaced about 15,000 miles ago. So they shouldn't be too bad. I'll look over the wires and wait to pull the plugs if the O2 sensor doesn't fix the mpg drop.
I'd say the problem isn't going to be the plugs and wires...

I'll make the assumption that you have the original sensor, and they do last about 60,000 miles roughly.... But even at that point they have lost some of their signaling ability, or basicly they slow in their signaling rate, causing the engine to run richer for longer...

when you get the new sensor install, reset the PCM( dissconnect battery ) and allow the PCM to relearn... Then the next time you go on a good highway run clock the MPG'* for us... If you stay between 70-80<---- Yes inbetween this range, you should do 29-32..

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Old 06-22-2005, 12:25 PM   #17
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what order should I replace stuff. A new CAT and O2 are on their way. What do I replace first?
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Old 06-22-2005, 12:28 PM   #18
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I'm gonna say O2 as a priority. It'* easier, and will probably have the most notable affect for you. Maybe if that'* the problem, then you MPG getting back to normal might help pay for the Cat....
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Old 06-22-2005, 12:37 PM   #19
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so replace the O2 and then take it in for the CAT
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Old 06-22-2005, 12:37 PM   #20
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Yes, because if the O2 is bad you don't want to torture and kill the new cat with it.
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