Engine misfire - P0300

Tiny
DWAYNEDETERMAN
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
I have a 1999 Chevy Blazer 4.3l, 4wd that suddenly started running very rough and could barely pull itself down the road. Fuel pressure is about 57psi running, and 60psi with the engine shut off. Check engine light came on - P0300 - random cylinder misfire. I have tested the ignition module and it is good. I was going to replace the coil, but can't figure out how to get it out of the bracket - it looks like metal dowels holding it in, but I can't drive them out. The fuel pressure regulator was replaced less than a year ago, but the spider was not replaced at that time. I need to know how to replace the coil, and how to accurately diagnose the spider. Thank you.
Thursday, February 17th, 2011 AT 3:16 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
This code can happen by a bad MAF sensor FYI

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Here is how you replace the coil, grind off the rivets and use bolts to reinstall the new coil will come will them

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers
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Thursday, February 17th, 2011 AT 3:19 AM

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