![]() Watch the coolant level in the reservoir. A slight increase in headwind or speed through the air reduces that. My 98 and 03 will give 30-38 at 50-55 mph on level glacial plain roads out into the country. Have you taken the car on a normal speed highway drive and set the gas mileage readout and seen how well the mileage is doing? Using the gallons and the odometer to measure mileage is not as accurate. The throttle body would need cleaned only if you have an uneven idle at times, or if when you start the car and go to mvoe the accelerator, it sticks until the first time you move it because the crud has thickened and is touching the throttle plate. Use an artist's brush hairs to wipe the two electrical wires that are very delicate. ![]() ![]() I'd suggest, if you do it yourself, taking out the MAF and gently cleaning it with a cleaner for MAFs sold at auto parts box stores (CRC is a company that makes the brand I have). How are plugs and wires? Have plugs been changed in 40 K miles? Mixing the two gives about a midgrade octane. You might also try adding a fill of a name brand premium that claims extra good fuel cleaners to a tank that's got less than half full regular to give a better mix of cleaners in the gas. It's my opinion, not proven fact, that some get more alcohol in their fuel than others do. You might change gas stations and brand if you tend to frequent one particular station or brand. You may sense a change in the motor's response to accelerator after 10-20 miles. When fuel is about a quarter or lower, add the Techron, then add fuel. I'd get a 20 Oz bottle of Techron for fuel system cleaning (not the injector cleaner version). ![]() The gunk settled on the inside of the upper intake and on the throttle body doesn't affect the gas mileage it may affect the idle quality and may cause throttle sticking when first moved after engine cools and throttle body shrinks. Lots of short trips, high AC usage, alcohol in fuel, and other things can lead to lower gas mileage. The leSabre is a 3800 Series II, I believe. Pass key 111 unit is installed factory but, the keys I have do not have chips in them, never have.(also security light it not blinking on dash)Īny and all suggestions and very welcome and thank all of you for taking your time to read and possibly help me outįirst, I doubt it's the same engine. Removed ignition switch(Took it apart all contacts and wires are in pristine condition but what I observed was that the vehicle has the same problems with ignition switch removed so could that still be the problem?) The power seats do move when battery is pluged in.I have no dash lights nothing other than the mentioned above. The radio will turn itself all of the way u or down when battery is plug back in but, no power to it other than the tiny security light(on the head unit not dash). The lights illuminating the driver and Passenger door window and lock buttons are constantly on (have to unplug the battery) and the horn will stay ingauged if Pushed at all. No selections of the ignition switch would ingauge (key Pos 1,2,3). I drove my car all day mind you, went into a friends house and came back to the car (2000 Buick lesaber) and attempted to start it. Hello, I have recently ran into a Problem that just bogels my mind.
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