Causes and Fixes Chevrolet P0300 Code: Engine Misfire Detected

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Күн бұрын

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@t-boneshamanjones1033 Жыл бұрын

Seems like you covered all of the possibilities, explaining clearly what to look for possible causes multiple codes etc. Now I gotta get at it & check it out again. Thanks

@robertzollars2083 3 ай бұрын

My 1998 silverado replaced the distributer and camshaft sensor all new wires, spark plugs, distributer cap and rotor. Shortly after puller a po1345 camshaft to crankshaft correlation code. Cleared the code and then it went to a misfire code on cylinder 6. i ended up replacing the crankshaft position sensor and then did a reset on the ecm using alligator clips. Removed the negative battery cable and hooked one end of the clip to the positive cable still connected to the battery and the other end to the unhooked negative battery cable. Let it set for about 10 to 15 minutes. Now it runs like new and no more codes. Originally it idled good but when you got up in higher rpms it would shutter and misfire. This took care of the issue thank goodness.

@cameronbachelor4066 21 күн бұрын

I've got a 1996 c1500. Reman motor with less than 2,000 miles. Started out with a cylinder 7 misfire, cleaned the plug, that turned into p0300 multiple misfires. Now, new plugs, distributor, retimed, EGR, pcv, and fuel filter. Still throwing p0300. Any ideas?

@robertzollars2083 20 күн бұрын

@cameronbachelor4066 since you replaced the distributor the camshaft sensor was also included, I would go ahead and replace the crankshaft sensor and reset the ecm. The two sensors communicate with each other.

@jerryseinfeld6283 6 ай бұрын

Thanks man, your video helped a ton. Pulled all the plugs and was able to diagnose the issue and get up and running again

@Blue-Blazes 6 ай бұрын

You are extremely informative. And to the point. Thank you

@ZGDX_Smiling_ 11 ай бұрын

After watching this video many of times, I will just blow off or vacuum the dirt on my air filter, my MAF sensor is still good because I made sure that the air filter is securely on it. I have to check spark plug again and maybe use my old ignition coils that I kept when I replace with the other new ones. It is always good to keep old ignition coils that is known to work. I watched another video saying dumping HEET Bottle anti-freeze water evaporator into the gas tank driving it for a while will work. Clogged Exhaust I know I do have because P0420 came up before P0300 and I know I have to replace my rear catalytic converter. In a forum said that if you replace the rear catalytic converter, you will have to replace the two front catalytic converters as well. The one by radiator and the one against the firewall. Without changing the rear catalytic converter for so long, that maybe my spark plug been burning so much, and the gap has widened on its own?

@johnsamuels6021 7 ай бұрын

Don’t forget bad gas! Water in the fuel will absolutely give you a P0 300. Also, don’t drive the car If the check engine light is flashing! It doesn’t take long for it to ruin the catalytic converters.

@mmorgan901 6 ай бұрын

What would be good for treating bad gas? And how did you fix yours

@johnsamuels6021 6 ай бұрын

Dry Gas/Gasline Antifreeze. (It’s alcohol). It mixes with the water and allows it to be burned up. I also used a good quality gas/diesel additive

@lordserpentine8246 6 ай бұрын

Currently driving mine and it’s flashing

@liampacatte4867 2 ай бұрын

Depending on your state you don't have to worry about catalytic converters

@ghozty_2162 Ай бұрын

Im thinking it was bad gas i put it was some cheap gas brand i usually put shell and this time my lazy as just pump on the closest gas station… also i put a new throttle body the day the code showed up

@herbertlockukjr493 Ай бұрын

I have a brand new 2024 GMC Sierra with engine code P0300. Some times at first at start it looks like it misfires but when it warms up it run fine.

@michaelgaeta3151 8 ай бұрын

Bad o2 sensors possible? Im having all kinds of issues on this used 09 2500 hd it has been beat and abused so im finding problems every day but specifically this misfire issue

@nopejhonson958 3 ай бұрын

would have been nice if you described when the problem happens to what is happening, p0300 code on my chevy, check engine lights intermittently but only on the highway at 60+mph, prett sure its spark plugs but it could be gasket issues

@georgemack1395 10 ай бұрын

I have a 2000 Camaro 3.8 with a PO300 code only. I have replaced MAF sensor, fuel injectors, ignition coils, control module, fuel pressure regulator and fuel pump, Cam sensor and crank sensor. New fuel filter also. Still have the code. If it was just 1 plug bad, there would be a code for that if I'm correct.

@johnsamuels6021 7 ай бұрын

@georgemack1395 - Did you figure it out? I’m working on my wife’s 2012 GMC terrain V6, and I’m leaning towards the ECM or the PCM.

@elcomandante9299 6 ай бұрын

@@johnsamuels6021leaning the wrong way. Dont be a parts changer.

@cliffordjasway6817 Ай бұрын

Be a parts changer don't hafta fix that part later or be on the road broke down later 😂 saying should just replaced it all

@zacharysummerlin3383 11 ай бұрын

Super helpful! Very educational! Love it!

@KarolinApollo 2 ай бұрын

You explained that real good

@unknowsecurity9694 11 ай бұрын

I’m only getting P0300. Nothing else so what would that mean code 1/1

@mmorgan901 6 ай бұрын

Did u ever figure it out

@unknowsecurity9694 6 ай бұрын

Yes it started with the Engine coils from there the spark plugs and since then everything has been good another thing invest in the device called fixed it really helps 👍🏾

@user-2uf2kr2c 6 ай бұрын

P0300 is random misfire. Regards

@mmorgan901 6 ай бұрын

@@unknowsecurity9694 I did all that and injectors.. I'm still getting a code.. I have the fixed it by the way

@unknowsecurity9694 6 ай бұрын

There can be a few things honestly another thing my spark plugs had to be spaced correctly other than that it can be one of these A weak ignition coil Contaminated fuel injectors Excessive carbon build-up on the intake valves Low fuel pressure due to a faulty fuel pump A vacuum leak An exhaust leak A faulty camshaft position sensor A clogged catalytic converter Compression loss Hope this helps hope you get it fixed

@FATMAC_365 11 ай бұрын

EXCELLENT DETAILED INFO!

@winfree95 5 ай бұрын

Along with the P0300 mine is showing B2961 which I found out is the BCM. Should I change BCM first to see if that works? Also I changed the plugs about 2 months or so ago. Thanks Greg

@HVAC_Mechanic 5 ай бұрын

The BCM usually only affects components located in the body, not the engine, unless there is a wiring issue.

@winfree95 5 ай бұрын

@@HVAC_Mechanic after sitting up for over 7 years when you crank it all the lights on dash come on. Will changing the BCM help with that ?

@BMC-dr9bz 8 ай бұрын

I have an 03 Silverado I’ve done everything but the air filter. If it’s that I’m going to be upset with myself 😅

@potoae2691 8 ай бұрын

Check the crankshaft position sensor, had to fix mine. Went underneath and seen the wires leading to sensor exposed, fixed the wires and got a new sensor. I went through a lot just to find out that everything from fuel pump, fuel filter, spark plugs and spark wires, to the distributor cap you name it… all that to find out it’s just the damn CP sensor and it only takes under 5mins to fix 🤦🏻‍♂️😂

@ericsheehan1521 5 ай бұрын

Ok I have a 06 trailblazer 4.2 litre I changed out the fuel pump /injectors /coils/plugs/o2 sensor/checked the cat in it that was clear all new gaskets on intake and throttle body and it still has the code and I did a compression check and there all the same there all over 200 so I have no idea I even checked for vacuum leaks with my machine and nothing I’m stumped any ideas on what else to check ? Or could cause this ?

@HVAC_Mechanic 5 ай бұрын

Misfires can be hard to troubleshoot sometimes, since it is a P0300 code that usually means it's something that would affect the whole engine such as a sensor, fuel pressure, air intake. If the engine runs OK, it might be only an only 1-3 cylinders causing the problem. The spark plugs could be removed and matched to a spark plug burn chart to see which cylinders are having the issue.

@richardmoore1133 8 ай бұрын

Great information!!

@reeeeeeeman8792 Жыл бұрын

Do you think it could be a fuel pressure regulator because I know it is not the fuel pump or filter but has low pressure

@HVAC_Mechanic Жыл бұрын

A bad fuel pressure regulator can cause low fuel pressure.

@rosskennedy1960 8 ай бұрын

Have you looked at the TPS? this sensor can cause issues with your fuel/air ratio. Also make sure you clean your throttle body with throttle body cleaner as it could be sticking.

@joshuajohnson2823 Ай бұрын

Good job man, everything else that I watched, dodges what I need to know. This was to the point and on point.. I like that. Good *&^$

@jimmye3855 Күн бұрын

So I got P0300 with a P0172 can you help me pin point the problem

@HVAC_Mechanic 19 сағат бұрын

The engine is running Rich for some reason. Rich codes can be difficult to diagnose since so many things can cause it. I made a full video on how to troubleshoot a P0172 code. Here is a link. kzbin.info/www/bejne/pITOgKGNgct_p7s

@steelersnation4L 8 ай бұрын

I have a 03 Chevy Tahoe with P0300 code and P0134 any help ?

@josh8518 Жыл бұрын

i have a 02 gmc 1500 that has this code it starts hard but when it is running it runs great. Any ideas on this?

@alsaaidh Жыл бұрын

You can do the basics of checking your spark plugs and ignition coils..air filter if its dirty...but most of the time you get a misfire when the car is cold is because of a bad intake gasket...when the engine is hot you don't see leaks because everything expands....

@davidacosta8060 7 ай бұрын

thank you

@T_733 3 ай бұрын

What if I don’t have no other codes that popped up before and after I fixed my 02 sensors they don’t pop up no more just this code I’m thinking it’s my fuel pump I changed the spark plugs coils and injectors mass air flow sensor

@HVAC_Mechanic 3 ай бұрын

A P0300 can be hard to diagnose sometimes, especially when there are no other codes. Basically, all the components that can cause it need to be tested.

@VMDelapaz 6 ай бұрын

Im getting a p0305 p0300and p0420. Any ideas?

@kekomarquez932 2 ай бұрын

I have a silverado 09 1500 it has a very minimal failure when it is turned on and parked it feels that it shakes a little but very little, if it disconnects a coil it feels that it fails more, I can't identify, because the fault is very minimal it shakes very little, change spark plugs and cables

@marcjohnson9270 6 ай бұрын

How bout this scenario..... an P0300 code and check engine light. Repair done, includes 02 sensors (3 of 4), throttle body cleaned, one new coil pack, new fuel filter, EGR valve, air filter. Rough idle gone and CEL also gone but now has low RPM at idle (500) with some stalling. Would appreciate any help. Thank you. 2001 Suburban with 5.3 liter with 231K miles.

@HVAC_Mechanic 6 ай бұрын

The throttle body may need a Relearn. Usually, it will relearn on its own when being driven, but you can look up the steps to speed it up.

@marcjohnson9270 6 ай бұрын

@@HVAC_Mechanic Thank you, appreciate the help! Keep the vids coming.

@samuelfrodge4988 5 ай бұрын

Done all this and still p0300 code. 57psi fuel pressure. Plugs,wires,egr,pcv valve,rotor cap,o2 sensor,injectors,fuel filter. Still lost on this code

@HVAC_Mechanic 5 ай бұрын

If all the parts are good, it is likely in the wiring.

@KarenListo 5 ай бұрын

What about bad 02 sensor..i have bad one

@HVAC_Mechanic 5 ай бұрын

A bad 02 sensor will not let the engine go into a what's called a closed loop, which will cause the engine to be less responsive and possibly use more gas, but it won't cause a misfire.