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Exhaust pop sound with misfire

Tiny
SIMPLEONE
  • MEMBER
  • 2005 NISSAN BLUEBIRD
  • 1.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Hi, My car (Nissan Bluebird Sylphy) gives a continuous popping sound from the exhaust. This only happens when the car comes to the operating temperature. An engine miss is also associated with this.
* Changed the spark plugs, Ignition coil
* MAF cleaned, air filter changed
My guess is the ECU get a too lean signal after reading the articles here. Any lead into what to look for will be greatly appreciated. Thank you
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Sunday, January 27th, 2019 AT 7:52 AM

22 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning

Yes, it sounds like it is running lean. It will cause this type of misfire in the system.

Is this gas or diesel?

I need to know to further help you.

Roy
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Sunday, January 27th, 2019 AT 8:42 AM
Tiny
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Good Morning, It is running on gas (octane 92). Is there a possibility of a leak? There is a pop coming from the exhaust when the ignition is off after a trip. The pop frequency reduces to 0 within 30 seconds or so gradually.
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Sunday, January 27th, 2019 AT 8:47 AM
Tiny
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Thank you

I would start with a compression test. A burned exhaust valve will cause this issue.

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

https://www.2carpros.com/articles/how-to-test-engine-compression

Beyond that I would verify timing. If the valve timing is off from a worn belt or chain, it will retard the timing and it will backfire from the exhaust.

https://www.2carpros.com/articles/how-a-timing-belt-works

Roy
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Sunday, January 27th, 2019 AT 8:51 AM
Tiny
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Thank you for the reply. I will check the compression. That and the timing never crossed my mind because the car pulls great.
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Sunday, January 27th, 2019 AT 8:59 AM
Tiny
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Yep, but if the timing is off, it will backfire.

Roy
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Sunday, January 27th, 2019 AT 9:07 AM
Tiny
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Alright compression and the timing I will get checked from a shop. The guides will help me to tell them what to do. What about the pop when ignition is off?
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Sunday, January 27th, 2019 AT 9:10 AM
Tiny
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Fuel burn off in the exhaust after turning it off.

Roy
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Sunday, January 27th, 2019 AT 9:12 AM
Tiny
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Yes. That could be it. Thank you very much for the help. I will update here what fixed it for someone's future use.
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Sunday, January 27th, 2019 AT 10:29 AM
Tiny
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Your welcome

Always glad to help

Roy
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Sunday, January 27th, 2019 AT 10:33 AM
Tiny
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Hello, Still couldn't go to a mechanic. But captured a sound file of the engine.
https://we.tl/t-pOIHNNqKry (Audio file link)
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Wednesday, January 30th, 2019 AT 7:40 AM
Tiny
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Okay, sounds noisy.

When was the last time you had an overhead done?

Roy
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Wednesday, January 30th, 2019 AT 7:55 AM
Tiny
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Three years or so.
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Wednesday, January 30th, 2019 AT 10:06 AM
Tiny
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This is I am holding the phone over the engine block after fully warm up. It is not that noisy when the hood is closed. But it does sound like a diesel in the audio than a 1.5 liter gasoline. I am worried about that continuous ticking.
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Wednesday, January 30th, 2019 AT 10:08 AM
Tiny
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I would start with having an overhead done. The valves sound like they are asking for an adjustment.

Roy
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Wednesday, January 30th, 2019 AT 10:15 AM
Tiny
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Thanks. I will post an update.
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Wednesday, January 30th, 2019 AT 10:28 AM
Tiny
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Sounds like a plan.

Roy
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Wednesday, January 30th, 2019 AT 10:33 AM
Tiny
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Alright so got it tested with the mechanics. First they wanted to make sure the ignition coils are not leaking. Once that is eliminated, spark plugs were checked. Nothing wrong with that. Then cylinders and valves were cleaned by burning solvent through the PCV. After this engine became smoother and the misfire was reduced a lot. They advised to run for some time and see. If the problem doesn't go away, next is a throttle body cleanup and if not removing valve covers and deep cleaning.
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Thursday, January 31st, 2019 AT 2:15 AM
Tiny
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Sounds like they think it is carbon build up.

Roy
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Thursday, January 31st, 2019 AT 2:58 AM
Tiny
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I guess so. What do you think? They said if these cleaning won't do they'll get to the timing. Which you advised earlier in the thread.
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Thursday, January 31st, 2019 AT 4:38 AM
Tiny
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Yep, I would have done the timing first to confirm it.

Roy
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Friday, February 1st, 2019 AT 3:25 PM

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