Code 300 means you have a random miss that is not serious enough to pick one cylinder. The computer measures RPM on each cylinder as the plug fires. So it is not that a cylinder is not firing but rather that it is not producing enough power.
Other causes are vac leaks and lack of fuel.
Testimonial: "ok so while I was driving the check engine light came on and I got the code PO301 so I changed coil number one cause it said missfire on number one cylinder and once i did that PO301 no longer appeared it was PO300 So Im thinking that maybe cause its hard to get to that maybe I didnt place it right what do you think? I need this fixed asap and dont really have to money to take it to the shop. But I pretty much do all my mechanic work myself anyways. So any advice?"
SOURCE: 05 Colorado - New Spark Plugs, Rough Idle
Sounds like you got two wires mixed up. Check your firing order. If not that, then you dropped a spark plug and flattened the gap. If it's a V6 the firing order is 165432. If it's an 8, it's 18726543.
SOURCE: Engine misfire, EGR replaced still rough idle!
First, check the passageway to the egr valve to make sure it is clear (often plugs up with carbon) second, make sure that the egr control is working. Also a good idea to have any codes checked and old ones cleared.Computer may need to cycle a few times to "learn"new parameters.
In general, it is good to shut down your engine when check engine light comes on...The next step after that is to determine why the light came on.
If the cause is an oil related or coolant related item, you should drive no further 'till it's corrected...However, there are numerous sensors that can turn it on with no disasterous results if you continue to drive One example is the light coming on because a gas cap has not been put on correctly...On many vehicles this will turn on the light and set a code, but the car will suffer no damage if you drove to your destination before correcting it.So, if the light comes on and it is not overheating and you have good oil pressure, and you hear no noises from engine, have it looked at but don't put yourself in danger on the side of a major highway for a nonsense code.
Most major parts houses will read codes free...take advantage of that service and get yourself a basic repair manual, so you have an idea what all the stuff under your hood is and does.
Good luck with your car!!
SOURCE: service engine light blinks,code read out of po300
Code p0300 is the code for "random missfire detected". The "check engine" light is flashing to warn you that severe damage is being done to the catalytic converter.(very expensive)..
SOURCE: I HAVE A 2001 CAVALIER
The P0172 code is a rich code most likely caused by the P0300. The P0300 is a random/multiple cylinder misfire code. Replace the plugs and wires.
SOURCE: I have a 2003 silverado
Pull the vac hose going to fuel pressure regulator and see if it has fuel in it. If it does replace it. Just fixed one with multiple misfire codes.
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STEPHEN:
ok so while I was driving the check engine light came on and I got a code of PO301 so that when I changed coil number one cause it said missfire one number one cylinder and once i did that PO301 no longer appeared it was PO300 So Im thinking that maybe cause its hard to get to that maybe I didnt place it right what do you think? I need this fixed asap and dont really have to money to take it to the shop. But I pretty much do all my mechanic work myself anyways. So any advice?
Yes that is possible but it could be something else too. Even spark plugs that are borderline, or dirt in the fuel line. You may have to wait until you get a code for a specific cylinder to proceed.
Code 300 means there are more than one cylinder that is not producing the expected amount of power. But yet enough to keep from setting specific cylinder codes.
I had a code P0304. I bought my 04 Trailblazer used and decided to replace all coils and spark plugs. Pretty easy task, but ended up with a code P0300. I went back to check my work and found two coil connections not seated properly. I made sure all the connections were locked in place. Runs like a champ!
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