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Code P0300

Tiny
EDHERRERA99
  • MEMBER
  • 2005 CHEVROLET MALIBU
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 59 MILES
I got code P0300, I installed new spark plugs w/boots and it still misfires.I took it to the dealership repair shop and they said it was the ignition coil. So I replaced that and the problem still occurs. Where can I look next?
Saturday, January 22nd, 2011 AT 9:46 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Random misfire are usually caused by vacuum leaks and bad fuel.
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Sunday, January 23rd, 2011 AT 1:33 PM
Tiny
EDHERRERA99
  • MEMBER
  • 3 POSTS
I pulled the spark plugs out to check if they were the right gap, and found out that the side plugs were pitch black and the two in the middle were nice and clean. Does this lead me to think its the fuel injectors?
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Sunday, January 23rd, 2011 AT 2:27 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the sparkplugs, compression and injectors for those cylinders
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Sunday, January 23rd, 2011 AT 7:29 PM
Tiny
EDHERRERA99
  • MEMBER
  • 3 POSTS
Do I check the clean spark plugs or black spark plugs. Sry?
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Monday, January 24th, 2011 AT 10:28 PM

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