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Whats causing the misfire

Tiny
K.W.
  • MEMBER
  • 2001 PONTIAC GRAND AM
  • 160,000 MILES
The code is p0300 have changed plugs and wires, coils still misfireing on 1 and 3
Sunday, February 19th, 2012 AT 3:43 AM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
Check compression on the two cylinders, make sure you are getting good spark to them and the injectors are working.
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Sunday, February 19th, 2012 AT 4:02 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Normally caused by vacuum leak and bad fuel-Check those cylinders sparkplugs, compression and injectors
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Sunday, February 19th, 2012 AT 4:02 AM
Tiny
K.W.
  • MEMBER
  • 2 POSTS
Thanks will check that tommrow.I forgot to tell that this started after the catalictconverter stoped up, had it replaced
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Sunday, February 19th, 2012 AT 4:33 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have the O2 sensor checked
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Sunday, February 19th, 2012 AT 5:05 AM

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