Code P0300?

JACOBPAULSEN

MEMBER
2003 MITSUBISHI GALANT
2.4L
4 CYL
2WD
AUTOMATIC
130,000 MILES

I messed with the ignition coils now car starts then shakes. Then when put in drive moves 50 feet then shuts off.

Thursday, September 15th, 2022 AT 5:19 PM

6 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Yep, this is a random engine misfire code, which can be one of two things, either you have a weal fuel pump or the MAF sensor is going out. Let's start with the fuel pressure which you get rent a gauge for at the auto parts store. This guide can help you see how to do the job with diagrams below to help as well:

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

Fuel pressure

ITEMS .................... STANDARD VALUE

Vacuum hose disconnected .................... 330 - 350 kPa (47 - 50 psi) at curb idle
Vacuum hose connected .................... Approximately 270 kPa (38 psi) at curb idle

Check out the images (below). Please let us know what you find.

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Friday, September 16th, 2022 AT 11:08 AM

JACOBPAULSEN

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The car worked fine until I pulled the ignition coils out and put them back in. So, you don't think that the code has anything to do with that.

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Friday, September 16th, 2022 AT 12:55 PM

JACOBPAULSEN

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64 POSTS

Also, the car runs super rich.

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Saturday, September 17th, 2022 AT 10:07 AM

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Yes, it could take apart the coils again and looks for bad connections. Also, if you can upload a short video of how the engine runs, I can tell you what's going on. Try to unplug the MAF sensor to see if it changes.

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Monday, September 19th, 2022 AT 3:31 PM

JACOBPAULSEN