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  #1  
Old 09-21-2017, 11:45 AM
Jason1016 Jason1016 is offline
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1999 Pathfinder
 
Join Date: Sep 2017
Posts: 2
Default Please help! Qx4 300 code!!

I recently got a 300 code on my 99 qx4 Infiniti 3.3l. Cold start is fine. After that, it's a rough start with a rough idle. Please help!
  #2  
Old 09-23-2017, 10:22 AM
smj999smj's Avatar
smj999smj smj999smj is offline
Master Enthusiast
2006 Pathfinder
2003 Frontier King Cab
2003 Frontier KC SVE 4x4
 
Join Date: Jun 2012
Location: Prospect, VA
Posts: 1,866
Default

P0300 is random misfire. There are a lot of things that can cause that on a VG33E engine. You wan't to make sure your sparks plugs, ignition wires, distributor cap and rotor are all in good condition; it is important to read the old spark plugs for abnormalities, such as carbon fouling or blistering. Make sure there are no vacuum leaks or splits in the intake duct. Confirm proper fuel pressure and perform a fuel pressure leakdown test using a fuel pressure gauge. Check engine compression. Check ignition timing using a timing light. There are many cases where a bad distributor can cause this, but you need to start with the basics.
  #3  
Old 09-24-2017, 03:24 AM
Jason1016 Jason1016 is offline
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1999 Pathfinder
 
Join Date: Sep 2017
Posts: 2
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Thanks so much. I changed my plugs, cap and rotor and my code reader says emissions passed! No more bogging down.
 

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