P0300 FIX And A Blinking Check Engine Light

[@M.Ladydub]

You're awesome🤣 Thanks for the info. I enjoyed the sarcasm and humor def needed that because this 💩 is stressful. I got my spark plugs, my wires with booties and a coil pack from auto zone recently 🥴 I mildly attempted to replace them myself...however F that! Not for the faint of heart especially in the bitter cold of winter, so... Today I will be taking my 02 Ford explorer sport with it's blinking check engine light (by tow truck) to the shop and politely asking the mechanic to please tune her up. She is very angry and scaring me. I will NOT be driving her. She throwing me misfiring codes for cylinder 3 & 5. 😁 I'm hoping with the info u provided me the mechanic won't be attempting to get over on a woman by assuming I don't know what's up. Because I CONFIDENTLY DO (now) thanks to you 😁 Before watching I was 80% sure this was the problem but the massive attitude displayed from Big Red (my explorer) it seemed like it would be more complex to fix. Well🤞🏻this is all I need. Thanks again! P. s. Cute dog 🐕

[@WrenchSense]

Very glad to help. Thanks for the comment. Glad you liked the video. Most people are afraid of our dog Drogo. I will tell him that you think he is cute.

[@detroitjohn4724]

so what happened ?

[@putheflamesoutyahoo1503]

@@detroitjohn4724 fix or repair daily

[@dellaangel]

Thank you. New mechanic at the shop we used for decades sold me a "good well maintained" 05 Jeep renegade, i took it home, and found out hes a damn liar. Seems it sat for years untouched until he tweeked it to sell it. I washed the vehicle to find rusted passenger doors bondo & painted over, junkyard backend still has blue paint on it (visible after carwash) Hoses dryrot. Etc. I get new codes just days after every repair. Replaced power steering pump & hoses after it broke & leaked on highway at 70mph. radiator & coolant hoses exploded in a snowstorm, Just spent a couple grand to rebuild the transmission last week, now o2 sensor p0152 & p0300 w flashing engine light. I wish i was DONE but i Put so much money in to this piece of crap, i cant afford another car 😭 thanks for the educational video. U definitely earned a follow!

[@alx.8721]

😂

[@debrawilson-oi6cg]

Dude this seriously helped me out!! My check engine light has been blinking for over a month now!!?! I have changed out all 3 ignition coils, all spark plugs and wires, AND the ignition control module and the dang light is STILL blinking! 😭😭 You gave me some EXCELLENT ideas just when I was feeling stuck and didn't know what else to do!

[@WrenchSense]

Right on. Glad to help. Thanks foe the comment!

[@dwightlongchallon424]

Check oxygen sensors.

[@juanjuventino570]

Did you fix the problem?

[@billycoger85]

Amazing. I've listened n tried so many other people's thoughts. Now. U alone have given the most knowledge that is perfectly explained. I salute u...now enough w blowing smoke up your a#&....I have two 2000 jeep 4.7. One 4wd. N one is two wheel. My wife's two wheel has issue still n trans not wanting to shift until high revs n hard n sometimes slips. Just spent 1800 on the trans n installation. But this is what's happening. N gear shift off. Over drive is neutral. I'm doing the advice u gave on throttle body. N brand new coil packs. X 8. N plugs x 8. Ran perfect. For 100 miles at 110 mph. Let off gas. Just little. N started missing bad. But just at times. So there's my story n I'm working on it at 4 n am. Butter cold. On the street. ..4wd. I rebuilt the engine total top n bottom. Cuz. The notorious knocking at purchase. It wasn't lifter or rocker but after replacing all those I rebuilt it. Laying on ground. N street. N front my house. ....it runs perfectly lots lower. But hard start n stalls after few mins. Ether6stRts it. After I blue. Cover across street n two fires later. ...any suggestions

[@jasonrogers9169]

Awesome! Please go on all the other KZbin channels that try and explain this but don't really know and to the comments that try to correct it when they don't know either and praise the one or ones that actually know what there talking about and tried to explain it only to be told we don't know what we're talking about. So I had came across two 4.2 Chevy's with cracked egr valves that coded 0300 no egr code. Was unnoticeable until cleaned and gasket surface buffed when it showed and they were rather large going nearly around the valve. One 5.7 with similar but different situation where the metal tubing running from the front to back on driver side head off egr had split about an inch long on inside wall. Also 0300 no egr. Just throwing it out there in case.

[@myisonu4639]

thank you for the breakdown. I am actually working on my truck and have gained additional knowledge with your video. LOL, just wanted to respond to what you said about a boring topic, it's only boring till it happens to you.

[@WrenchSense]

Glad to help

[@MrNickelodion]

Congratulations, I resend this file to a coworker who is beginner on mechanic staff, but your video is pretty graphical and easy to understand even for me. Thank u so much!!!!

[@WrenchSense]

You bet! Thanks for the comment and share.

[@shadowfan1642]

Dude this is sad idk if what you say is gonna work or not but mechanics in my family said a lot of stuff to try and if this works you are a saint to me and also thank you for the advice I'm glad you made this video.

[@LegflexUtube]

Good advice, thank you. My p300 and p304 ended up being a bad injector, just in case others run into this. Cheers!

[@retiredsnowbunnyhunterx5106]

Did you replace all your injectors or just one?

[@LegflexUtube]

@@retiredsnowbunnyhunterx5106 I replaces all of them. The OEM injectors where i live (Cancun) are pretty affordable for all 4 of them. I think I paid about $120 USD for all four injectors. I also noticed that the fuel rail was very dirty inside when I removed it. NOTE: I also replaced the PCV valve that was a bit suspect. The car has been running great. Good luck.

[@Lightning7474.]

I watched the whole video...very helpful! My light has blinked & now it's not. You help me figure out the areas where I can diagnose the problem. Thanks, much respect.

[@stephenmoore8715]

You are awesome and saved me some money by far if i followed you right. The misfire is only in the #2 cylinder i will follow your advice and change wires and plugs and see if it fixes the problem ....i just had the engine light flash on me today i will have it scanned in the morning to see.if there is a change it had misfired before but engine light did not flash thank you again for the fantastic input

[@brackpritchard2215]

Thank you, it was driving just fine this morning, went to go to the store in the afternoon and it's running rough and blinking check engine light on, started up Normal but I got a couple of blocks away from the house and the check engine light comes on and Starts blinking, turned around immediately and parked it, now I am trying to figure out what has happened

[@everydaylife2843]

03 dodge ram 1500 5.7 I have 4 out of 8 coils cracked, my truck died going 75 would start idle hard for 15 secs then die again with code p0300 with a flashing engine light. Coils show up tomorrow so fingers crossed I appreciate this video

[@hyperATVS]

Was it your coils

[@tedwilson3137]

My 2001 Chev Silverado 1500 wasn’t used for about 4 months. Started it and runs a little rough with blinking po300 code. Not driving it for a few months, is the first thing to check the spark plugs and wires??? Great video and personality!

[@5up422]

Fuel filter

[@stephenscott9271]

2002 ford taurus se wagon 3.o v 6 243567 Mike's have code po 304 po305 po306 replace spark plug check engine flashing replace coil pack replace spark plug same problem what to do thanks steve

[@gearhead3500]

2003 Toyota Tacoma 2.4 has a p0301 changed spark plugs an swapped coils an sprayed around the intake for vacuum no vacuum leaks .

[@theresachiaverini9325]

What a blessing this was so very helpful; I have codes PO300; PO301; 302; & 303 Gonna have a tune-up right quick Thank you!!! 👍 Will recommend this to everyone 🤗

[@dw4940]

Did you figure it out?

[@princegkee4699]

Very elaborate video, you exhausted every point.

[@atmosrepair]

1999 tahoe, codes were p300 p301. Check 1 cylinder plug, swapped out no change. Reading plug (all new platinum 2 summers ago) and it looked like rich mixture. Tested PCV valve good. Then looked at fuel pressure regulator, it was missing completely out of the box. Went to 3 different auto stores, ordered one napa. Got it, put it in no change. Tested fuel pressure rail, it was at 50, book says should be 55 to 62. So tomorrow I am going to replace fuel filter (also only couple years old).

[@julianmartinez4479]

That's the kind of valuable info that works man !

[@catfishgardens743]

Thanks man I'm miss firing ive changed out all my plugs and wires my engine light stopping flashing for about a month and now its flashing again so I'm clueless

[@chadrickcummings4319]

battery check

[@zerg1011]

I got the blinking CEL while I was doing 120 km/hr and noticed absolutely no difference in power nor heard a difference in RPM. Got another blinking p0300 code today while doing 65 km/hr, again noticed absolutely nothing wrong with the engine whatsoever. After doing some research and watching your videoI'm going to attribute this to the fact I'm running a straight pipe exhaust with no catalytic converters or o2 sensors. She idles like a trooper and purrs like a kitten when you feed it some of the good stuff.

[@shawna7975]

Did you take the o2 sensors out? I alao have no converter/straight pipe👍 @The bOss if you took o2 (both) out or just 1 at a time?

[@zerg1011]

@@shawna7975 Yeah, no cats = no need for O2 sensors because they aren't going to read worth shit anyway. Originally had 1 cat removed because it blew out, then I got the other side done. Haven't had the blinking engine light come on since. Might of taken some time for the ECM to figure it out, who knows. All I know is it works and I love the noise.

[@shawna7975]

@@zerg1011 thanks!

[@luischavarin5873]

What i got random and every cylinder as well 2007 5.7l Toyota Tundra. Changed spark plugs coils. Injectors pvc valve fuel regulator. Compression test came out good. Within 10 psi every cylinder. About to do a fuel pressure test. Waiting on special adaptors this Tundra does not have a schrader valve to connect to. I think I see a leak and might be losing coolant. I thought it might be the valve seals. Since the spark plug threads come out with fresh oil on them. But I will try to do a compression test on the radiator see if I see anything. And possibly a block test. Coolant does not look Toyota pink. Might have never been changed and has become acidic. Look more orange a lil tainted. Any guidance welcomed. I’m misfiring on all cylinders on cold start once it reaches drink temperature I can erase the codes. And they won’t come back till it’s cold again.

[@lorifish2034]

Love this video, very helpful, and humorous! Thanks!

[@WrenchSense]

Glad you liked it! Thanks for the comment!

[@dc8061]

Check the battery first. My engine light was blinking, car was hesitating, it took long to shift gears and when it did the car jerked. I changed the battery and now it runs fine.

[@jamiegoodson950]

Have a 2003 Silverado 4.3 runs fine until pulling a steep hill Example: Steep graded highway mountain scenic highway. Between 60 and 70 mph when passing gear engages check engine light flashes then goes off. Only once read a code of unburned fuel in cylinders. New rotor button /distributor cap/wires &plugs fuel filter and map sensor. Still occurs. Only under the conditions previously listed. Haven't checked for vacuum leak but will that next. New air filter also OEM. Had truck 3 months 140,341 miles. Any suggestions would be appreciated. Great video!!!

[@timothybailey2335]

5.7 vortec Chevy express 3500 engine light blinking at 55 and I already changed plugs,wires,cam shaft position sensor? Help???

[@m3vt2seffn]

About two weeks ago I just replace the intake manifold because any fries was going into cylinder seven and eight well I replaced cylinder seven and eight with brand new spark plugs and a brand new coil it still says eight cylinder needs to be replaced are the mechanics say yes it's a vacuum leak or a cam sensor that I need to change so do you have any vise to share with

[@kangokidkidd4037]

I had a misfire on cylinder one ...so I replaced spark plugs and all 6 coils and now and now my check engine light is blinking...the check engine light was on BUT now it's blinking so it got worse oh and I also changed all 4 oxygen sensor....so what the hell is wrong...thanks for your video.

[@rapvault98]

Did you ever figure it out? I’m having the same problem

[@kyleboynton874]

You ever fix your issue

[@ericoz650]

Why this code appear only during driving? Cuz when car not move on N position everything is ok. Plus on LPG no codes, but if use gasoline thrn its appear.

[@jackjones9460]

Good info any funny too. I’ve got a P0300 so looking for a general cause; not expecting each cylinder to have the same problem. 2002 Odyssey

[@eduardomontanez4661]

I have the diagnostic trouble code P0 300 on a 2004 Silverado 4.8 I replaced the coils and spark plugs spark plug wires and I still have the P 300 also did a fuel pressure test which it reads 62 pounds at idle and 58 pound PSI‘s with key on.& new intake gasket only thing left is fuel injector & last a compression test ?😂

[@arturodiaz4106]

Would a oil leak be connected to a p0300? I don’t know where exactly it’s coming from but it’s small and I’m having to add oil to the engine. I have already changed plugs and wires. I guess my next step is to check for vacuum leak and change fuel filter.

[@jarroddurant2407]

Absolutely love video omg I have check engine light blinking gas smell I can smell it on driver side valve cover 6 cylinder engine I almost went bought a sensor saw this video idk wtf is going on but gas smell exhaust omg its strong why is my car not catching fire? I will start with plugs coils I need code reader I think really screwed myself thanks dude hit thumbs up subscribed

[@jarroddurant2407]

I'm baffled but more educated with your video

[@shawna7975]

@Jarrod Durant same! Gas smell after driving around 10mins, rpms drop bad going uphill

[@jarroddurant2407]

@@shawna7975 hey yea u know what i did couple days ago i replaced all 6 ignition coils all 6 spark plugs 2 gaskets my problem went away misfire gone check engine light shut right off car running mint only took 3 days for the old oil to burn off muffler lol car 2003 running brand new

[@shawna7975]

@@jarroddurant2407 thats awesome! All that was done on ours was replace coil, and new waterpump. Check Engine light flashes now at stop light in idle

[@jarroddurant2407]

@@shawna7975 u still have misfire i u may wanna check all your coils make sure in right plugs flashing light usually from bad coil

[@HowardHill-yy7sv]

I have a 99 Dodge Ram 1500 with a 5.2 magnum. It's showing codes po300-302-303-304. I replaced plugs wires fuel pump and also checked for vacuum leaks, nothing doing. Any advice

[@macminn18]

Great video, well done! Informative, precise, and to the point. I'm not a big wrench on cars guy, but helping my daughter out whose 2013 Outlander threw that code. Wasn't starting at all. Plugs were pretty fouled. Cleaned them, still wouldn't start. Getting fuel, plugs were wet. Cleaned them again the next day, it started. Replaced them, now time will tell if that's all that it was or not. The code reader showed P0300 P. Does that trailing "P" mean anything? I am a little concerned that there's more issues than just the plugs. It seems to be throwing some smoke out the exhaust. I'm not sure what's normal for that car (she's not a big help telling me either!) Thanks again for the great information.

[@WrenchSense]

Glad you liked the video and thanks for the comment. It helps my channel more than people realize. I am not familiar with a "trailing P" It could just be a trait of whatever scanner you are using. I have never seen it on any of the Snap-on scanners. In general the P before the code indicates a powertrain issue. For example, there are B codes which indicate a body issue. Is the smoke from the exhaust only occurring at start up or is it there after driving? In general smoke at start-up that goes away after warm is a valve seal issue that allows oil to enter the combustion chamber while it sits. Smoke after warm indicates bad piston rings which would show up as low compression on one or more cylinders. Could also be caused by a faulty PCV (positive crankcase ventilation) system.

[@frisqy8273]

I bought a genesis coupe, came w new engine from dealer, it’s been a 2 months since i’ve had it, & there had the work done back in february. i noticed i got a CEL, got the p0300 code, went to auto zone scanned the variable camshaft solenoid? i’m not sure if that’s as you mentioned where they try to profit off you. instead i popped the hood and went thru the whole car and made sure all plugs and hoses were ok w no leaks. the cel came off all of a sudden

[@virtualax2k626]

I had a quarter tank and the car was running fine. I went to fill it up and down the road, it started misfiring and threw the blinking check engine light but it went away after about 3 minutes of driving. It’s been running fine ever since, but I don’t let it get close to quarter tank. What could that be? Fuel pump? Idk.

[@johnfink9020]

Mine just did the exact same thing 2 days ago. Bought it, drove ok then stopped to put bout 1/2 tank in it. Bam, engine light, rough af idle, loss off 90% power etc. Changed both cats, all 4 O2 sensors, now im having complete coil pks, wires, and plugs. If that doesnt fix it, on to fuel regulator, fuel pump, fuel filter. My last 2 guesses would be mas or shift 1/2 solenoids. As of this typing im $2600 into repairs to locate this bullshit p300. Smfh Ive heard could also be a vacuum leak from intake. Who knows at this point. Truck is a money pit. '05 GMC Sierra

[@virtualax2k626]

@@johnfink9020 I changed the fuel pump and that seemed to fix it. It looked as if the original fuel pump was still in the car and the car is about 18 years old.

[@forrestfuller6359]

​@@johnfink9020 you can use water to find large vacuum leaks and starting fluid to find large and small vacuum leaks. Starting fluid can be more risky than water but it's a lot easier to notice the change in your engines rpm when spraying it lightly over components that create vacuum

[@bowhunter10167]

Thanks for your help in the process of troubleshooting my 03 silverado with the p0300 code .

[@xan_carman4216]

What’d yours end up being

[@haziel4922]

What about a bad battery(weak)? How likely?

[@hyperATVS]

Very likely…. I’m hoping this is my issue. I had a friend ask me if it’s my battery. I didn’t even know that could cause a missfire. Sure can though, his car was idling real rough and would barely run.

[@ahmed-guitar-music]

thank you very much, very informative and helped with the problem I have with my car

[@sergioramos2413]

I need help, my 2012 jeep patriot have a code for #4 cylinder, I already changed the spark plugs and I switched the same used coils from differents numbers and I still have the same code for cylinder #4, i I did a compression test and the results are there #1=185 #2=190 #3=160 #4=190 and also my engine light keeps flashing. Any ideas? Thanks

[@captainsview3303]

Great video and presentation. Thanks for the help!

[@christophergreen3585]

Question my 13 Toyota Camry will at random engine light will come on also trac light I’ve replaced all plugs and coils and it’s still doing this and recently the engine light came back on and off blinking and which made car sputter then turn engine off no lights and car running fine I’ve reset it and able to drive no lights and bam out of no where engine light comes on along with trac light why does it do this at random

[@buggiekids5559]

Dodge ram people make sure you disconnect your negative side of your battery. When you change your spark plugs or coils, it will cause your crank sensor to go out on you. That’s what happened to me. I change my spark plugs, and the thing started misfiring. I thought it was the coils so I put a new coil pack on there same thing P300 it ended up being the crank sensor because I didn’t disconnect the battery.

[@kaliforniagudari]

Thank you! 2001 s10 going crazy over here lol

[@regalbowman3143]

I've subscribed...your information is detailed and accurate/ helpful..good content.

[@moebarakat7895]

I have Cadillac Escalade ESV 2018 I did all the steps and I still have P0302 it is so frustrating . Spark and spark cable coil injector still have issue any recommend please

[@shrimp8004]

The first 2 wiresi pulled off at coil didn't change tune of the engine this means both coil r no good right is this possible

[@luismelendez1761]

Excellent information, that's what I called great video, thanks for having the time to help me to find the problem and to fix it, God Bless you.

[@lennyskippen]

If i have a exhaust leak before the 1st oxygen sensor, can that cause a p0300 and all kinds of things to go wrong?

[@WrenchSense]

Sure can if it is severe enough.

[@danysaade2286]

I have misfire p0300 p0172 p0175 on my 2022 suburban 5.3 Change 16 lifter camshaft spark plug and wires still the same. Cylinder number 3 injector keep dumping fuel Any idea

[@adamandrews2681]

Yo!!! I just picked up a 2003 Eddie Bauer expedition 5.4 (2 VALVE) .. AND I drove it about half hour or more with blinking light ... Also it only has 140,000 miles on it.. think i burnt up the cats??

[@rickiebrooks3707]

Hey...great info...my 2006 Ranger was running rough then hit some high water after a really good rain. Well having poor accelleration and power loss, especially going up hill. Going to do the plugs and wires first. But I was thinking it might be the crankshaft sensor since it is low in the front

[@ArmandoRodriguez-yv6el]

That might your fuel pump... Losing power going uphill is one of the symptoms of a failing fuel pump.

[@whitemorn]

Good advice. Your character impersonations were funny ... maybe do some community theater?? It's fun!

[@goldiegoldenbear7282]

I was driving in some hill country today and started my cruise control and then I noticed to check engine light come on and was blinking. I immediately turned the cruise off and it went away. It was only on for 3 seconds. Do you think this is still a concern? I drove for 25 miles and no engine light and the Silverado wasn’t driving rough at all. I plugged in my obdII and it had maybe a stored code of P0300- pending And if it didn’t give a cylinder number , aren’t the chances very low of it being a cylinder misfire? Thanks for the video and help! New sub

[@lynnmerritt8873]

You have me quacking up! But I do understand what you are talking about.

[@anthonyreddy2834]

Very helpful 👍 301=bank 1, 302=bank 2 not cylinder 1 or 2 😉

[@chanceevans8958]

You got that backwards buddy

[@marktinnin69]

Have PO300 on a Pontiac Sunfire with cylinder 2&3 no spark 1&4 has spark have replaced all

[@andreacraig9540]

2015 Chevy spark So when I push the car to fast to hard chech engine light and tcl blinks. I have had plugs and wires and coil packs changed but still getting a random miss fire code. So what do u think it could b?

[@lizard944]

P0300 is frequently a bad O2 sensor. If it runs good from a cold start then idle gets lumpy and exhaust starts smelling rich after a few minutes (closed loop), then it's probably an upstream O2 sensor.

[@shawna7975]

@lizard944 ours is REAL bad, engine light flashing whole time driven with misfire sounds, exhaust smell!! All started with leak from reservoirs tank onto them getting them wet

[@lizard944]

@@shawna7975 Yes, antifreeze on the spark plug wires can cause a misfire. You can check the wires at night for shorts. Go to a place as dark as possible, not inside of a garage...LOL. Make sure your headlights are out. Let your eyes adjust to the darkness for a few minutes. Run the engine and if you see sparks "fireworks" all over your wires, then they are shorting. With the engine off you can use warm water sprayed into the engine bay to rinse the coolant off of the wires. Let it dry then you can wipe the plug wires with a rag soaked in WD-40. Good luck

[@shawna7975]

@@lizard944 wow! Will try, thank you so much!

[@nazareta6541]

Lizard, how sure are you of this? This sounds EXACTLY like my issue. I have ONLY P0300. Check engine light and P0300 code comes on after cold start about 20-25 seconds (as it starts to lower RPM/idle) and car/engine starts to shake noticeably. Pretty hard to drive in this condition. If I leave car running for about 2 minutes, it will begin to smell of eggs/sulfur. Pls advise?

[@nyonyoziprim]

I recently changed my oxygen sensor and the problem persisted

[@Gmackk]

Spark plugs changed, radiator changed, egr valve replaced. Ignition coils replaced. Throttle body replaced. Map sensor, pcv replaced. camshaft sensor changed, only codes popping up up or bank 1 o2 sensors a bank 2 o2 sensors. Cars starts an idles fine but as soon as the gas is pressed down check egine light blinks for abt 45 seconds?

[@upnclouds7428]

I recently decided to do a tune up on my 04 silverado 5.3 vortec. Before I began I had no issues and no check engine light. So I replaced all 8 spark plugs and went with 4 iridium and 4 double iridium because I'm impatient and didn't feel like waiting for the store to order more regular iridium. ( let me know if this was a bad idea) so I replaced all spark plugs wires and coil packs, I also replaced my ect sensor because I noticed the connection was broken. So after all that, now I'm getting a blinking check engine light and p0300, I have taken off all the new parts and put them back on over and over and cannot figure out what is causing the misfire. Any advice?

[@roseevans8440]

Big problem here. Idk if you can help but plz if you can think of anything else I would appreciate it we had code 305 changed plugs, coil twice ect. Ran through your video check the vacuum fuel pressure and still has flashing engine light and reads code 305 any suggestions would be helpful thank you

[@brendagordon206]

Same thing with my car, funny thing though, my car is not overheating or loosing coolant

[@leejensen7550]

I have a friend who has a 2004 Chevy Impala with p300 and I tried all of these tests and we were still unable to figure out what was going on with it.. my last thing I was going to inspect was the cat to see if it was clogged.. but I kinda gave up on it .

[@ryankansa8498]

2004 nissan 350z had camshaft bank 2 and we replaced it also we replaced all spark plugs and igntion coils and still having p0300 and check engine light flashing when driving car for 3 minutes and car has no power

[@SUMO31364]

I have p0101-p0104 it happened after i changed the coil packs on one side of the engine (i drive a subaru wrx 2004) i never touched the other side and im not sure why thats throwing a missfire now

[@ammoncumberledge4547]

On a 2014 Hyundai sonata where is the knock sensor .where can I find it.

[@judetherrien9359]

thank u thank u thank u this my first time here txu txu txu your good in explaining things . video'ing your up close face brillant

[@ScottyfromCO]

Great video! Would a misfire cause limp mode?

[@eddiecoronado1300]

Did you ever find out ??

[@WhiteDoveSam]

I do believe that a misfire can cause your vehicle to go into "limp mode" (which is basically the cars way of protecting any severe damage from happening to the engine or catalytic converter). So, if you're only running on 3 cylinders; for example, it doesn't have full power and wants to protect itself. This happened to me recently and my car was in "limp mode". I was also getting the "injector circuit open" code along with the misfire.

[@WandaLofton-qm3mt]

Cool dude really good video but I did everything and still nothing could plugs cam crank fuel pump o2s all them map and it will run like shit then it will run great but if its runing good and I get on road to get up speed it will start it again p0300 I'm at a loss it's very clean oil every 3k never missed all man done even diff trans transfer case it just started out the blue and got me stumped idk want to do next any input would be good

[@stephaniebourget8339]

If I end up with a missfire and it's got a skip my first step is start pulling each wire one buy one . If it runs route, move on till you pull one that has no change. Then try an figure if it's the wire bad or plug or coil. You can spray the wire with water or left the hood at night for any sparking usually youl feel it anywhere hahaha then check for spark Frome coil buy stuffing a screwdriver in the end of plug wire trying to cross it over something meatal to check for spark if all is good with a nice blue spark Nott 🍊 that's bad or weak spark then check the plug. Shit adds up quick exspetioally if the car is worth 500.00 . I hope your doing the checking or work. If all is good not an itidmitting spark that can happen if unshure put the screwdriver in another plug good one. An get an idea what it looks like usually just pulling off a little bit you can tell buy the sound. you should hear the sparking anyway if you get lifted doin this I suggest changing your wires hahaha. Kinda like having your buddy stick his finger in the lawnmower plug wire to check for spark hahaha. Anyways don't buy shit till the basics are figured out. Pull the wires dry if unshure start the car up at night and wet them a little to see if you can see visible spark this is best at night. This is a good start . Make Shure the engine is cool before attempting . Best of luck.

[@AM-sq5ut]

Old School Stephanie!! I love it! Blast from the Past! Wish I could afford an older car/truck that had the older ignition systems. They end up being $$$ pits. They were much easier (and funner LOLOL) to work on. Thanks!

[@brianboyd9891]

I've had so many problems on my canada made 97 gmc jimmy should I just scrap it where do I get parts most discontinued is it just junk after the parts are used up?

[@norbertocastillo8551]

That's what I'm talking about good .muy bueno

[@emcv29]

This helped a lot! Thank you.

[@texasgonzo67]

It took me exactly 38 seconds to realize this guy is more worried about acting a dork than fixing anything.

[@kaliforniagudari]

This is the best p0300 video that you will ever find.

[@reyvicente5261]

Very helpful for me was one miss fire cylinder

[@WrenchSense]

Glad it helped

[@Pibs2525]

Hello, I got a p0304 code then changed out all the spark plugs now I got a p0300 code and it shakes even more. I also changed all the coils, wires and even cleaned the mass airflow sensor and throttle body, have any clue what may be the issue? I have an 07 GMC Sierra 5.3

[@rapvault98]

ON THE SAME BOAT RIGHT NOW!!! Did you fix it??? And if you did, how???

[@Pibs2525]

@@rapvault98 it was my lifters on cylinder 4 I changed out the lifters and put non dod lifters with a new cam and flashed the computer

[@rapvault98]

@@Pibs2525 camshaft sensor that is? Did you have a code for the camshaft sensor? I do not

[@rapvault98]

@@Pibs2525 what is a lifter exactly? What should I search up for my 07 Mercedes s550? A lifter?

[@Pibs2525]

@@rapvault98 that could be one of the problems but since yours is a Mercedes’ I’m not too sure how to diagnose that car. Mine was a gmc sierra

[@Blossannova]

I have a 4.6 3v in my mustang and it has a check engine light flashing. I replaced plugs,coils, compression tested it, smoked it, replaced a fuel pump, but the car only misfires when there is a load like for example when putting it into drive and it’s only cylinder number 5 that misfires no one knows what’s wrong with it and I’m stumped anyone have this issue before that can help?

[@AM-sq5ut]

Is your engine Fuel Injected or carbureted? Have you had the Fuel Pressure tested? Plugged/Pinched fuel line?

[@Blossannova]

@@AM-sq5ut yea I even replaced the little plastic clips for them that connect to the fuel injector cause it’s crap plastic and still nothing

[@darryljacobs4090]

I have tried/replaced/ checked everything on your list, what's you opinion on the upstream 02 sensor causing random intermittent misfires?

[@josephatherton2781]

Thankyou for the good helpfull information .

[@johngibson9191]

My p0300 code has something to do with emissions in 2015 silverado what's that about sir

[@mysticalsevyn8156]

My car dings check engine light blinks 40 seconds later dings again and goes off what does that mean?

[@medsimvallejo]

Fantastic video!!! Well done!!! Thanks!!!

[@jaysonpotter4549]

I’ve got a cylinder 4 misfire code changed everything I can think of including the head and intake manifold, coils, plugs,wires, injector. Still have same issue????? Any thoughts?

[@WrenchSense]

Try a compression check. If compression is low on that cylinder you will get a dead misfire.

[@jaysonpotter4549]

@@WrenchSense after changing everything, I went from 65- to now 170 compression

[@Force1Com]

Changed your cam with the head?

[@Force1Com]

You sure the injector is getting a signal?

[@deliciousness8183]

Crank sensor relearn

[@Saratuttle90]

What if your code reads for camshaft position sensor will that cause shaking

[@stephaniebourget8339]

Usually not. it just might not start one day when it gives out completely. like a crankshaft sensor. . But wrong timing can cause misfiring it's calibrating your timing . So it could very well case rough idle skipping an lean air an fuel mixture usually not good either way

[@todd4952]

What if random misfire only occurs on acceleration and not on idle

[@StricklyCryptic]

here I've got a good one for you, 2006 Cadillac Escalade I've done everything besides the injectors and the coils the coils test positive with a bench test under load I'm experiencing zero misfire however I'm getting a flashing p0300 random misfire I looked at my fuel trims everything is normal My catalyst system is working properly truck has 174,000 mi on it factory catalyst system still within spec however above 70 mph I get the check engine light flashing I drop down to 60 mph it goes away completely not even on the dash

[@StricklyCryptic]

Not to mention I had stainless steel brake lines put on the truck from master all the way back The guy was supposed to get into the check engine light for me said he couldn't replicate the problem and that all cars especially 20-year-old ones now will always have a check engine light on as a mechanic I took this as an insult but went on with my business because I didn't have a lift to do my own brake lines and depended on somebody else to do it for me so I couldn't speak on his hypothesis.

[@isaachaller834]

What if the flashing light pops up and then goes away in about 45 seconds

[@forrestfuller6359]

I want to know this also

[@Jay.G_]

My buick verano got a p0302 code. Went and fixed the fuel injector (cylinder 2). Then it fixed the problem but the car ran for like 5minutes when this code apeared with a CEL in total before. Now I’m thinking since I got only p0300 now that my cat is broken or clogged. Normal idles for me, everything is normal exept when I use the throttle at about 50% +, the car start bugging and hesitating and the CEL starts flashing again for about 1 minute, then it stays on (The CEL) and the only code I get is a p0300 now. Feeling like it’s a dirty cat. Help?

[@Gmackk]

@@Jay.G_did u ever fix it?

[@Jay.G_]

@@Gmackk Yes I did, my car is fine. The initial problem was really the fuel injector. My car is a 2.0L Turbocharged 2015 buick verano. It is direct-injection therefore the car really can’t handle regular gas. Always put 91 or supreme if recommended. I’ve done some of research on that and the fuel injector probably stopped working because of ethanol. Where I live there’s always around ~10% ethanol in the gas, so that might explain it. The higher fuel grades are probably better than regular gas because they have more cleaning and better additives. I’ve used Lucas Oil about 7 times now, while always using 91-93 octane grade. This really cleaned all of my fuel injectors. And the reason I still had check engines like P0300 is because one of my spark plugs was cracked and broken (The new ones I’ve installed after then initial problem I’ve had) and I didn’t even noticed. Anyways feel free to ask me questions

[@lucasadamson5839]

@ Jay.G_ my car is a 3.5 vq35hr I have a po300 and I’ve replaced injectors and plugs and checked all coils the CEL blinks around 3000 rpm maybe eye valve of cat ? Anything helps

[@tombrady6697]

What do it mean when a code comes and go

[@jimmyhamm6041]

I SET MY GAP AT .60 FOR 96 SONOMA 4.3 4X4 NEW WIRE PLUGS CAP AND ROTOR ALSO SPIDER INJECTORS. THERE ARE NO LEAKS PRESENT AROUND THE MANIFOLD.

[@kierrajackson4226]

I have a 2003 Cadillac cts I have po300 301 303 305 all on the de bank any suggestions

[@cynthiahoward6153]

I have done everything you said and I still a misfire code.. have changed the spark plugs and ignition coils and still have a p0301..chevy malibu 2012. Please help. Thank you

[@deliciousness8183]

Have your done crank relearn?

[@enriqueorellana214]

Fuel injectors

[@imposter0shadow]

So I have a 97 3.8 firebird that runs great, but if I hit 2500 rpm and hold it there for more than 30 secs my cel comes on flashing with p0300 but instantly stops when I lower the rpm. Changed plugs wires and checked the coils, so I'm thinking fuel issue. Anyone else have the same issue? Car runs great and idles fine so can't be something major

[@kennywhitcomb1585]

Hello what about injectors ?

[@williamdaniels6943]

GREAT JOB PARTNER!

[@akrondon1]

I've got misfires on just one bank of a V-8 (Driver's side of a 2007 5.7 Hemi) and noticed that the fuel pressure test port was on the passenger side. Does that matter?

[@stephaniebourget8339]

The Dodges are notorious for this make Shure they are really good plugs I've replaced with cheaper plugs damn thing barely ran after thought the fuel pump was the issue nope cheap spark plugs. This was a durrango that this happened too. Did plugs wires an coils before trying new plugs againe. Thing has been fine since damn thing threw all kinds of codes before all this change out of sensors injectors all kinds of shit turned out it to be cheaper plugs than the original equipment parts.

[@smittyandthebaybayskids5231]

I have Changed spark plugs spark plug wires afraid to now change my fuel filter 04 Chevy impala shaking crazy flashlight my reader is saying cylinder four I change all of them

[@ummno8473]

Well said sir

[@memolaksta]

My engine light is on and blinking and while in park or idle it shakes. What could be the problem??

[@Ggg-ef6vb]

Same I’ve changed everything and still the same

[@Ggg-ef6vb]

@@amersal5952 yes apparently the coil pack harness was installed incorrectly

[@tomaslopez4322]

Man im going crazy, my g37 has a p0300 code and ive changed the plugs, coils and did the carb cleaning procedure and i didnt see a change on idle. Im getting back fires from my exhaust when doing a cold start, but wjen it settles it stops doing that and now my cel started blinking. Only mods ive done to my car is high flow cats, would that be the issue? May be bad o2 sensors?

[@cameron090895]

I have a Q50 3.7 and mines doing the same shit. I did spark plugs, coil packs, and all 4 O2 sensors and still nothing dude

[@tomaslopez4322]

@@cameron090895 mechanic found a vacuum leak underneath the intake plenum, changed gaskets and code was gone

[@InversePacman]

@@tomaslopez4322 yo I've got a g35 with this code and some shaking on idle. Found a tear in my intake PCV, patched it, hoping this solves it lol.