1997 Chevy Blazer large drop in gas mileage

155,000 MILES • 6 CYL • 4WD • AUTOMATIC
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HANKYPANKY
  • MEMBER
  • 1 POST
last year i replaced inigion cap rotor new cables coil plugs gas filter..this year i replaced 4 o2 sensors....in the last 2 months i noticed a drop from 15 to 17normal winter milage to 9 to 10 miles per gallon ..this year is a mild winter and do not let ingine idle long for warmups...had this vehicle about 7 yrs...the only thing i notice is when the weather is damp or rainy i feel a rapid bucking which goes away as soon as i feed it gas..i really try keep this car up to par....any ideas relcome....
Feb 22, 2010 at 2:07 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
I think the wires or dist cap you got need replaced already.

Try this, In the dark, open the hood, start the car, and spray a mist of water in the wires and dist cap. Watch for arcing and see if a miss begins.
Feb 24, 2010 at 2:36 AM
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