Causes and Fixes Chevrolet P0300 Code: Engine Misfire Detected

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Күн бұрын

How to troubleshoot and fix a Chevrolet P0300 engine code: Engine Misfire Detected
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How to Check for Engine Spark Video
• Engine Not Starting Is...
Read here for more information on a Chevy P0300 engine code: www.backyardmechanic.org/caus...
One or more cylinders are not firing correctly.
Possible Causes of Chevrolet P0300 Code:
⦁ Ignition system problems (Spark plug, spark plug wire, weak coil)
⦁ Fuel delivery issues (Weak fuel pump, clogged fuel filter, fuel injectors)
⦁ Air Intake (Clogged air filter, Bad MAF Sensor)
⦁ Vacuum leak (Damaged or loose hose or a leaking intake manifold gasket)
⦁ Clogged Exhaust
How to Troubleshoot a P0300 Code:
⦁ Are there other codes?
⦁ Check intake air filter
⦁ Find which cylinder or cylinders are not firing.
⦁ Check for spark
⦁ Check fuel pressure
⦁ Check for clogged exhaust

Пікірлер: 51

@t-boneshamanjones1033 8 ай 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

@jerryseinfeld6283 2 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

@KXTA007 Ай бұрын

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

@zacharysummerlin3383 6 ай бұрын

Super helpful! Very educational! Love it!

@FATMAC_365 7 ай бұрын

EXCELLENT DETAILED INFO!

@richardmoore1133 4 ай бұрын

Great information!!

@ZGDX_Smiling_ 6 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?

@davidacosta8060 3 ай бұрын

thank you

@michaelgaeta3151 3 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

@johnsamuels6021 2 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 2 ай бұрын

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

@johnsamuels6021 2 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 2 ай бұрын

Currently driving mine and it’s flashing

@steelersnation4L 3 ай бұрын

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

@alexislayne1521 3 ай бұрын

I got the PO300 and PO172

@VMDelapaz 2 ай бұрын

Im getting a p0305 p0300and p0420. Any ideas?

@josh8518 7 ай 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 7 ай 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....

@ericsheehan1521 21 күн 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 21 күн 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.

@BMC-dr9bz 3 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 3 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 🤦🏻‍♂️😂

@reeeeeeeman8792 10 ай 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 10 ай бұрын

A bad fuel pressure regulator can cause low fuel pressure.

@rosskennedy1960 3 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.

@winfree95 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 Ай бұрын

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

@winfree95 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 ?

@georgemack1395 6 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 2 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 2 ай бұрын

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

@unknowsecurity9694 7 ай бұрын

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

@mmorgan901 2 ай бұрын

Did u ever figure it out

@unknowsecurity9694 2 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 2 ай бұрын

P0300 is random misfire. Regards

@mmorgan901 2 ай бұрын

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

@unknowsecurity9694 2 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

@user-th7im1fy6z 19 күн бұрын

What about bad 02 sensor..i have bad one

@HVAC_Mechanic 18 күн 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.

@marcjohnson9270 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 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 Ай бұрын

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

@samuelfrodge4988 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 Ай бұрын

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

@user-cx3iw7xx6p 9 ай бұрын

i need help i have a 2007 chevy corvette with p0300

@AustinOutdoors. 28 күн бұрын

Did you ever figure it out?

@DanielSunday-pt1xu 3 ай бұрын

Hello

@richstrovers71 5 ай бұрын

I have PO300 as well as PO174 and PO171 too lean on bank 1 and 2

@ethanlaresser6118 5 ай бұрын

I do too did anything work for you? Still trying to figure out mine

@modus_operandi2508 Ай бұрын

Corroded wires on the ECM 90% of the time

@Crv-05 7 ай бұрын

I have a 02 tahoe with code p0300 previous owner install bosch sparkplugs with preset .040 gap, this engine need .060 gap, will that cause p0300?