Engine Misfire Code P0301?

GARCIA40

MEMBER
2016 FORD F-150
5.0L
V8
4WD
MANUAL
175,000 MILES

I replaced the VCT solenoid on my truck listed above and it fixed the issue. However, I started to get a cylinder misfire (P0301) after replacing the solenoid. The check engine light turns off sometimes and comes back on with the same misfire. The code wasn't there before.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,959 POSTS

It is common for the ignition coil/spark plug to fail and they need to be replaced on the number 1 cylinder. Here are the instructions in the images below to show you how, once completed, clear the codes to recheck. I would consider doing the remainder of the spark plugs and coils as well. Please let me know what happens.

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Thursday, February 23rd, 2023 AT 10:52 AM

GARCIA40

MEMBER
2 POSTS

I replaced the spark plug, the coil, and the fuel injector already.

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Thursday, February 23rd, 2023 AT 4:06 PM

KEN L

MASTER CERTIFIED MECHANIC
42,959 POSTS

Okay, then the next step is to check compression on the #1 cylinder please use this guide below and you can rent a gauge at the auto parts store for free or cheap. should be about 135 PSI or higher.

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

Remove the fuse # 45 in the main junction block (right rear of engine) to disable the PCM. Please report back with the readings. If the reading or okay let's do a vacuum leak check when the engine is cold.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please go over these guides and report back.

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Friday, February 24th, 2023 AT 12:15 PM