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01 regal bad fuel milage

2 messages,  Last post on May 04, 2009 at 4:40 PM

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#1 of 2 01 regal bad fuel milage by prestocat Jan 02, 2009 (10:31 pm)
I've changed the spark plugs, wires, fuel filter, and air filter. I've also changed the catalytic converter in aug 08 because the old one was plugged. I'm getting about 15 to 16 miles/ gallon right now. There are a lot of hills where I drive, but I was getting at least 20 to 21 miles/ gallon before. I've never taken the car on a long highway trip before, so I don't know what the highway mileage was. Also, when the car is idling, it sounds like it is sucking in a lot of air through the air filter box. You can hear it sucking from about 5 to 10 feet away. It's done this ever since I bought the car in June 08. Does anyone else's regal make this sound, this loud? Please help with either issue. Thanks in advance! Replies to this message: own4gms (May 04, 2009 4:40 pm)
#2 of 2 Re: 01 regal bad fuel milage [prestocat] by own4gms May 04, 2009 (4:40 pm)
Replying to: prestocat (Jan 02, 2009 10:31 pm) My 2000 Regal GS runs badly whenever there is a vacuum leak. I've replaced the vacuum lines (dealer item). The 180 degree elbow on the vapor recovery solenoid gets especially soft. Also, if you ventilation system doesn't switch between levels (defroster/vent/floor) the vacuum leak is on a long vacuum line from the engine to under the dash. My leak was caused by that vacuum line rubbing on the battery's negative cable where it attaches to the frame. I was able to disconnect the hose near the battery and slide a short vacuum hose connector available on the "HELP" isle at the autoparts store over the leak.

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