Code P0300 is not a timing code at all , it is a "Random Engine Misfire" code. Timing is computer controlled and no adjustment is required or provided for by the way. Follow the link for more info on the fault code P0300
https://www.obd-codes.com/p0300
SOURCE: engine starts,reaches high rpm,then slowly returns
Vacuum leaks. Check all hoses and intake bolts. Leaking EGR or plugged PCV valve. Air filter plugged. Leaking head gasket. Worn timing chain. Camshaft lobes worn. Valves burned or leaking. Fuel idle control system or sensor. Good luck!
SOURCE: 97 galant low idle in park or in gear at stop
double check your vacuum hoses, fuel filter, plugs and wires and air filter.
SOURCE: Buick Century 97 runs rough and stutters when cold and gas applie
start by replacing the plugs and plug wires, this is esp true if car has over 100,000 miles on it. damp air can make the problem worse.
Testimonial: "helpful"
SOURCE: u i have a 97 ford escort that idles rough so i
Often, on the Escorts of this vintage, rough idle can be due to a leak in the vacuum system. With the engine running, listen closely for any tell-tale hissing sounds coming from any of the vacuum hoses. Check that they are all securely in place and the end-clamps are all tight. Also check that the PCV valve and the hose connecting it to the manifold are securely in place. Another possibility is the Idle Air Control (IAC) valve. If it is clogged or sticking, it can cause rough idle. Refer to a service manual to diagnose the IAC valve. Other things to check: make sure that the air intake is unobstructed and clean. You might consider cleaning the manifold and throttle body. Check the air filter and replace if necessary. Let me know if you have any other questions.
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Coded pcm p0300
Awesome. ..thanks so much Yad :)
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