1995 Chevy Blazer poor gas mileage and intermittent misfire

Tiny
PBAULDOFF
  • MEMBER
  • 1995 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
Blazer always had problem with going through O2 sensors. Replaced and soon after, engine light would come on and be reading O2 sensor codes. Cat is hollowed. Problems getting worse after water damage when water got in exhaust. Ran bad, stuttered, with black smoke. Changed plugs and o2 sensors, ran ok, then got worse. Changed fuel injectors with aftermarket, seemed to run ok for a while. Now rough at idle and low rpm, but not stuttering like before or blowing black smoke. When cruising on highway it will have intermittent backfire or quick stutter, and when letting off accelerator. Gas mileage is horrible, like 10mpg. Did I get a bad injector, think the o2 sensors are bad? The engine light is on reading o2 sensors.
Do you
have the same problem?
Yes
No
Monday, January 4th, 2010 AT 12:46 AM

1 Reply

Tiny
PEAR69
  • MEMBER
With hollowed catalytic converters, you will never get the engines computer to deliver the proper amount of fuel at the right time. O2 sensors fail quickly when exposed to raw fuel in the exhaust. This is what is happening to your O2 sensors because the computer goes in limp mode, it dumps fuel in at the wrong time, because the Catalytic converters are not installed.
Was this
answer
helpful?
Yes
No
Monday, January 4th, 2010 AT 7:54 AM

Please login or register to post a reply.

Recommended Guides