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1998 Chevy Blazer Random cylinder misfire

Tiny
SBAKER74
  • MEMBER
  • 1998 CHEVROLET BLAZER
Engine Performance problem
1998 Chevy Blazer 6 cyl Four Wheel Drive Automatic

the blazer was running good one miniute and after shutting it off and restarting it the blazer was running ver bad and I could tell it was missing really bad I had autozone put a computer on it and it came up with a random cylinder misfire and also I have a question about over heating when the blazer gets hot the heater will get cold and when the then the temp goes back down it the heater gets hot again any info on and of the problems on this will be very helpful
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Friday, February 5th, 2010 AT 11:25 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0300 Random Misfires normally caused by vacuum leaks and bad fuel

Also engine misfiring can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel

Temperature problem-check and test the thermostat and coolant level
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Friday, February 5th, 2010 AT 12:22 PM

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