1996 Infiniti I30 P0300 code

Tiny
96INFINITII30
  • MEMBER
  • 1996 INFINITI I30
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 165,000 MILES
Recently had the head gasket replaced and when that was done I bought new champion spark plugs and after it was put back together I am getting the P0300 code. I dont think its a bad plug because out of 6 new plugs the code would mean at least 2 of the plugs are bad.

I sprayed carb cleaner around the gaskets and on all the hoses to see if there was a leak and nothing is leaking from what I can tell.

I did notice that when my gas is around a 1/4 of a tank, the gauge seems to wander around, once it went way down past the E mark. Could this be a sign of the fuel pump going or is there something else I need to check.

I havent had any issues with coils or anything prior to this code coming on. Also I got the code P1402, the EGR valve, but was told that thats being tripped by the P0300 code?

Any Help?
Friday, June 4th, 2010 AT 4:58 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0300 Random misfire is normally caused by vacuum leaks and bad fuel.
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Friday, June 4th, 2010 AT 5:51 PM
Tiny
96INFINITII30
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  • 21 POSTS
I dont think it is a vacuum leak nor bad fuel.

When putting on the new valve cover gaskets, I did notice they were much thicker than the gaskets I pulled off.

Is it possible the gaskets thickness is limiting how far down the coils go on the plugs?

***** I read that you should only use NGK or bosch plugs with platinum tips. I have the champion platinum plugs. Would that really cause random misfires?
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Friday, June 4th, 2010 AT 7:32 PM
Tiny
RASMATAZ
  • MECHANIC
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Wrong type of plugs and improperly gapped will cause misfires
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Friday, June 4th, 2010 AT 10:42 PM

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