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2002 Pontiac Grand Am, 2.2L eco-tech P0300

Tiny
JEDICLON40
  • MEMBER
  • 2002 PONTIAC GRAND AM
  • 4 CYL
  • 2WD
  • AUTOMATIC
I recently had my check engine light start to blink. Tested the code and it was p0300.

I changed the plugs, coil, icm, checked vaccum, fuel pressure even battery and alt.

after I changed the icm the car ran beautiful until I was in the drive-thru, the light started to blink again. As it is supposed to do, the engine went into rich mode ie. Trac off no power running rich. I am at my wits end! Any help in what direction I should go would be greatly appreciated. Also when it went into rich mode. It died and acted like the batt. Was dead until I jumped it.
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Saturday, May 7th, 2011 AT 4:39 PM

3 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Read codes again?
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Saturday, May 7th, 2011 AT 5:41 PM
Tiny
JEDICLON40
  • MEMBER
  • 2 POSTS
Yes, same code p0300.

Also just sis the dollar bill test on the tailpipe, tried to suck it in. Vacuum test held steady 40.
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Saturday, May 7th, 2011 AT 6:59 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
When it's cold again how does it run? Sitting in drive thru heats engine up. When it does it again, try unplugging MAF or ECT.
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Thursday, May 12th, 2011 AT 5:15 AM

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