Question about 2003 Oldsmobile Silhouette
Hi! Car is not running right thats for sure. Please try this... Replace automatic transmission fluid for the fluid may be burnt causing stress to the transmission which can cause fuel inefficiency. Once the atf is replaced, a smooth drive and shifting will be noticeable which results to better fuel efficiency. Hope this helps and have a good one.
Posted on Jul 04, 2010
Do u have a check engine light on? if no then the system is operating normally, it is a really bad idea to compare the MPG of 2 like models of different years things change that u are not aware of like weight of the van and engine and emission system changes to meet new federal exhaust standards, so the fuel mileage will seldom if never be the same, if there was a fuel control problem the computer that runs the fuel injection system would turn on the check engine light and a fault code would be recorded in its memory, this is a very tightly controlled system and will sense any problem that would lower fuel mileage. I have looked at hundreds of complaint like this over the years and this is the same answer in any case where there are no system fault codes and no check engine light. I have 35 years of experience, I am a certified master technician in engine fuel control and electronics
Posted on Jul 04, 2010
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Posted on Jan 02, 2017
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