1997 Chevy Blazer large drop in gas mileage

Tiny
HANKYPANKY
  • MEMBER
  • 1997 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 155,000 MILES
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.
Monday, February 22nd, 2010 AT 10:07 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 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.
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Wednesday, February 24th, 2010 AT 10:36 AM

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