Compatible spark plugs

2014 MAZDA 5

154,000 MILES • 2.5L • 4 CYL • 2WD • AUTOMATIC

JONSOLOW13

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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

Mar 16, 2020 at 8:40 AM

ASEMASTER6371

CERTIFIED EXPERT
52,796 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

Mar 16, 2020 at 9:00 AM

JACOBANDNICKOLAS

CERTIFIED EXPERT
110,175 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

Image (Click to enlarge)

Mar 16, 2020 at 9:05 AM