4.2 Vortec motor getting error code P300

JoeB
Posts: 1
Joined: Fri Dec 28, 2012 8:59 pm

4.2 Vortec motor getting error code P300

Unread post by JoeB » Fri Dec 28, 2012 9:05 pm

I have a 2007 trailblazer with a 4.2 vortec motor with 4 wheel drive. I am getting a funny noise from the motor and the engine light came on. I had the codes read and it came up with a P300. Can anyone give me any suggestions on what this can be.

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wildman
Posts: 49
Joined: Tue Aug 03, 2010 10:00 pm

Re: 4.2 Vortec motor getting error code P300

Unread post by wildman » Sat Dec 29, 2012 2:40 am

Here is the site link for engine codes :: https://www.greatautohelp.com/dtc/pcmdtc.html

300 on the list is engine misfire.

With a "funny noise" coming from it, could you describe it in more detail.
Like, does it sound like it's missing, whining noise, clicking, chirping, or etc.

The cause might be anything from dirty fuel injectors, a vacuum leak, low fuel pressure, a weak ignition coil, bad plug wires, or compression problems. Saw once or twice a broken distributor cap cause it. Even more serious would be worn timing.

That's why I'm interested in what type of noise you have

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