It should get aprox 17 to 19 mpg, highway. I am getting 14 miles to the gallon.
Typically it's a sticking injector. If it runs, try putting some injector cleaner in your next tank of fuel. Also, if the air filter is plugged the engine may not be getting enough air.
Modern fuels have a fuel injector injector cleaner built into them. However I do recommend you use a good fuel injector cleaner such as Seafoam or Chevron Techron once a year.
what type of Chevy 5.7?
The fuel filter on a 1987 Chevy Celebrity is next to the fuel tank on the driver's side of the car/
You will have to unbolt and remove the engine access cover inside the passenger compartment. Then you can easily get to the air cleaner.
The engine will develop a skip and the check engine light will illuminate. The code set in the ecm will direct you to which injector is bad.
See Engine Air Cleaner/Filter Check/Replace on page 6-19 of your "Owner's Manual", under Section 6: Service and Appearance Care...
Bad engine coolant sensor. Bad fuel injector. Plugged air filter.
What year and which air filter. Engine filter or cabin filter. 2001, cabin and Engine
In the engine bay fuse box...
The 3.9 liter Chevy engine oil filter can be found on the left-hand side of the engine. The oil filter will be near the oil pan.
Are you looking for the cabin air filter or the engine air filter?