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Compatible spark plugs

Tiny
JONSOLOW13
  • MEMBER
  • 2014 MAZDA 5
  • 2.5L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 154,000 MILES
I should have checked with you guys first. But, stupidly, I went out and bought four NGK 7090 BKR5EGP G-Power plugs for my car listed above.

Are they compatible?

I'm having random misfires when I drive. Engine code is P0300. YouTube mechanics say to first check for water in the gas (I'll put in a can of sea foam), then go to the spark plugs.

I had a slight misfire (I think) before they new plugs were put in. Now it's more noticeable.

As you know, I had previously reported a P0455 code. We checked hoses for leaks, they are fine. Next we are going to run a smoke evap test.

Your thoughts on the spark plug question?

Thanks,

Jon
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Monday, March 16th, 2020 AT 8:40 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The first thing I would do is check the actual fuel pressure. That is the main cause for the 300 code, not plugs.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Those plugs are fine to use.

Roy
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Monday, March 16th, 2020 AT 9:00 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Honestly. Use the OEM type plug. I suspect the misfires are the result of the plugs you used. Here is all the specifics as far as OEM spark plugs.

2014 Mazda 5 L4-2.5L
Mechanical (including Torque)
Vehicle Powertrain Management Ignition System Spark Plug Specifications Mechanical (including Torque)
MECHANICAL (INCLUDING TORQUE)
Gap

Spark plug gap (L3Y2 18110)
Standard. 1.25-1.45 mm (0.049-0.057 in)
New spark plug (reference). 1.25-1.35 mm (0.049-0.053 in)

Spark plug gap (LFJD 18110)
Standard. 1.25-1.35 mm (0.049-0.053 in)

Torque

Install in the reverse order of removal.

Tightening torque. 10-14 N-m (102-142 kgf-cm, 89-123 in-lbf)

________________________________

The code you listed indicate a leak or blockage. The first thing I would do is exactly what you are trying, smoke test. If no leaks are found, then we will break it down and start checking things. I attached a picture of possible causes of the code. Take a look through it and see if it helps.

Let me know what you find.

Joe
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Monday, March 16th, 2020 AT 9:05 AM

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