******10 MPG caused by what? Update******** - Page 4 - 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 04-28-2007, 02:18 AM   #31
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Originally Posted by trigga_b
Im not worried about the calipers anymore since thats not MPG problem. I'm going to let the shop handle that. But I think I need to go back to my stock muffler. does anyone have one plzzzzzzzzzzzzzzzz
seriously a muffler has no part in fuel economy AT ALL!!!!
look else where to solve you problem
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Old 04-28-2007, 03:21 AM   #32
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I cleaned the TB with it on because I had to order a TB gasket. I also changed my air intake set and tomorrow morning I'm going to cleam my vac system out and see how it drives tomorrow.

Edit: If this doesn't work then I'll look into getting another FPR or fuel pump. Wasn't there a recall on the gas tanks or something? Because when I make a hard right turn the gas needle falls like a half to a quarter tank. And its always moving when I stop and go.
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Old 04-28-2007, 11:57 AM   #33
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Quote:
Originally Posted by trigga_b
Im not worried about the calipers anymore since thats not MPG problem. I'm going to let the shop handle that. But I think I need to go back to my stock muffler. does anyone have one plzzzzzzzzzzzzzzzz
actually, if the calipers are not releasing, then yes they ARE a mpg problem. its more drag. more work the eng has to do to move forward = less mpg
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Old 04-28-2007, 11:59 AM   #34
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The no-baffle 92 tank is not causing your problem.

How about we get a fuel pressure gauge on that thing instead of throwing a pump or FPR at it?
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Old 04-28-2007, 12:32 PM   #35
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First, I am going to ask an obvious question....what brand O2 did you get? Don't say Bosch.

Second, another question...what brand spark plugs are in there? And PLEASE don't say Bosch Plats.
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Old 04-28-2007, 12:43 PM   #36
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Ok I'm not going to seafoam because I dont have time for a possible o2 sensor, cat, and/or manifold problem (may have cracks). I have a denso o2 and NGK sparkplugs. I'm goign to have a shop deal with the greasing of the brake parts. And I'll check my fuel pressure.
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Old 04-29-2007, 06:32 AM   #37
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Default Something'* cause low MPG

Ok, now I believe something is causing drag. Its either my rear brakes, since the wheel cylinders and brakes need replaced. I also think that my parking brake doesn't engage either. My car still slows down when I let off the accelerator 50-70 mph. It feel like driving a stick shift and you're shifting down to come to a stop. OR Is this a sign of trans problem? As far as my MPG I can get like 300 miles on a full tank driving on the highway. But in the city its like 12 MPG.

Also, I believe when you all say WOT that means smashing on the gas. if so then, when I smash the gas to try and get some quick speed, it doesn't pick up any. Its like a lack of power. My take off isn't good because I can't get momentum which probably contributes to my poor mileage in the city.
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Old 04-30-2007, 01:43 AM   #38
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What the ****, my cat is burnt . god dam. I did the brakes and knew that wasn't the problem because the car wouldn't really roll on its on, but they needed changing anyway. That punk *** o2 sensor fouled up and clogged and burnt up my cat. I don't have a vacum leak, I sprayed the rubber fittings with carb cleaner and got no response. So what is the root cause.
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Old 04-30-2007, 02:00 AM   #39
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I've got the same fuel needle problem, no worries. It'* pretty common from what I hear. Also, my parking brake only engages when it wants to, it was a defect in our year models.

I'm actually thinking of looking to replacing my CAT, and that may solve my power/efficiency problems. If I get to it before you, I will let you know.
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Old 04-30-2007, 02:19 AM   #40
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too bad I couldn't really feel the difference. I just put this magnaflow cat on here a month ago.
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