Better Than 18MPG?????? - 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 11-04-2004, 02:02 PM   #11
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Hows your driving style? The more open the throttle, the more gas you use.
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Old 11-04-2004, 10:26 PM   #12
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Quote:
Originally Posted by jr's3800
As for the Fuel pressure regulator and leaky injectors.... Hook up a fuel pressure gage and cycle the ignition on and then off... Look at the fuel pressure... If the pressure hold and doesn't drop over time, than you have a goof FPR and the Injectors aren't leaking
Not necessarily true. There is a check valve in the fuel pump that should prevent the pressure from bleeding down but I have heard from people much more knowledgable than I that the GM fuel systems are known for not holding pressure. A leaky check valve would leak down into the tank. I have to agree, jr'* method is easier. All I am saying is if you find a pressure drop with that method, don't assume it is an injector or FPR. It could be a check valve, which is not big deal Might just take an extra crank or two to get it started. .
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Old 11-05-2004, 12:35 AM   #13
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Wow, that is really bad. I put on about 300 miles a week. Very little of that is ever over 55mph. It is about equal mix between 15 mile highway a day and lots of town driving. I still manage 18-20. My driving style is VERY inefficient though I must admit. I think I'm addicted to adrenaline!
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Old 11-05-2004, 12:37 AM   #14
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Of course, the exhaust probably helped my car, so not quite sure what to tell you. I did however have a 1992 non */C Bonneville SSE for about two months. I drove this around and was getting 23 mpg with mixed highway and lots of city. I was amazed! I think you should be getting better mileage.
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Old 11-05-2004, 10:08 AM   #15
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How 'bout the Torque Convertor Clutch? Is it Locking Up after 45mph?
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