amysunkist

need help with this code and description please...thank you very much

chiph9

A P0300 is a misfire that isn't related to any one cylinder. If you're getting P030x codes for other cylinders, investigate those first.

Common causes include low fuel pressure, which agrees with what your scanner is telling you. Investigate things like fuel rail pressure, fuel filter, fuel pump (check pressure from it), and no gas in the tank.

If all that is good, go onto things like a compression test.

Also - how old are your spark plugs?

Chip H.

MrJason

That launch scanner should have 2 ways to read the vehicle.... “obd” and “scan”...

like what was said... p0300 is “random misfire”... this generally is accompanied with a cylinder misfire code. The codes al ways correlate with the cylinder number... P0301, cyl 1... P0302 cyl2.... and so on.

Just a P0300 code is generally set by aging plugs, fuel filter, or just bad fuel.

Is all the maintenance up to date?

amysunkist

I have changed the spark plugs and coils already. Just recently bought this 2nd hand car from family unsure of the maintenance on it. only got it last year july. could be the fuel I just gas regular unleaded but someone told to gas premium on it would that have changed, car down since months already.

dblshock

any fuel related issues on other engines? using the same fuel? you probably figured that out but I'd also try running TC-W3 oil in good fuel for 100 gallons or more.

chiph9

There's no technical reason to put premium in the GX470. It will run fine on regular.
However you might have gotten some low-quality gas if this started pretty soon after filling up.

Chip H.