Backfire in intake/air cleaner

Tiny
JESY HASWELL
  • MEMBER
  • 1993 NISSAN PATHFINDER
  • 3.0L
  • V6
  • 4WD
  • AUTOMATIC
  • 194,000 MILES
So I recently bought this vehicle knowing it had issues but cannot for the life of me figure out what is causing it. When I give it gas it makes a loud almost fart/popping noise that comes out of the air filter. Same if I rev it but if I slowly rev it it doesn't pop until roughly little over 2,000 rpm's. What could cause it to be doing this? Any suggestions on what would do it and what to fix?
Wednesday, February 27th, 2019 AT 7:08 AM

5 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
When I hear backfire I think spark timing and valve timing. How long since a tune-up? Here is link for backfiring:

https://www.2carpros.com/articles/engine-backfires-while-running.

Repair guides at top of page, check it out a lot of good information, different links. Spark timing, 15 degree btdc. As far as valve timing have to check timing belt. In the diagram you can see the alignment points for cam and crank. If you get a new belt, make sure the new belt has the proper shape teeth, evidently some belts have different shaped teeth and it makes a difference or there wouldn't be a service bulletin about it.
There could be other issues?
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Wednesday, February 27th, 2019 AT 9:47 AM
Tiny
JESY HASWELL
  • MEMBER
  • 3 POSTS
Timing belt was replaced ten thousand miles ago so still pretty new and done at a shop. Checked the spark plugs all are firing and in good condition. Still I played with the distributor to see if advancing or retarding it would fix the pop it didn't. I do not know if it is my MAS or a fuel pressure issue or a air fuel mixture problem.
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Wednesday, February 27th, 2019 AT 9:56 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Any applicable trouble codes that point to anything? Do you have good cylinder compression? Do you have proper fuel pressure? Without something to point in proper direction, it's hunt and peck for me. That backfiring caught my attention, so I wondered about valves and or fuel.
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Wednesday, February 27th, 2019 AT 10:32 AM
Tiny
JESY HASWELL
  • MEMBER
  • 3 POSTS
No, it throws 55 all clear for everything and no check engine light. I will check fuel pressure and do a compression test and get back to you.
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Wednesday, February 27th, 2019 AT 10:41 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Okay, let us know.
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Wednesday, February 27th, 2019 AT 12:24 PM

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