How To Fix P0300 Random Misfire Codes In Your Car




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Mohamed Sharaf: i have chevrolet optra 2010 and i have package of errors
p0300-powetrain
random/Multiple cylinder Misfire Detected

p0341-powertrain
camshift position sensor "A" circuit range/performance(bank1 or single sensor)

p0342-powertrain
camshift position sensor "A" circuit low input (bank1 or single sensor)

p1403-powertrain
tap for multiple description when i press i see talk about
EGR exhaust gas recurculations

its automatic gear car 2010 model optra
when the car is on N rpm is like trying to be low
if i moved to D rpm come low and high then low its about to stop but not stop some time i push accelration but it some where repond slowly
after the car move its fine till i stop or go very low speed

Oscar Serrano rios: p.s. spark plugs were changed about 2 months pre gapped.

Oscar Serrano rios: Mr Scotty, I have a 06 4.7 durango and it gave several codes po300 (2x's), po340, po335 (2x's) I've changed the crank p.s., cam p.s., tps, and another sensor next to the throttle p.s. can't recall it's name, the truck doesn't over heat but runs hot and forced low fuel economy, I see no visible coolent leaks or disappearing coolent, the radiator, hoses, thermostat, cap, water pump, and fan clutch have been changed, also did a coolent bleed out. it has hesitated on acceleration, turned off and turned right back on, it has hesitated to turn on but will turn on, on a couple of times, the fuel pump/filter have been changed, the alternator/starter/battery tested good. will you please advise or suggest on something else I could do besides burning my truck down. please

yusuihang: Scotty, how can a battery cause random misfires? Isn't the alternator providing all the electrical power when car is running? I've been trying to troubleshoot P0300 and had ruled out the battery because of this. But I just got a Waekon tester and found that the spark arc isn't long enough. I'm starting to rethink about possible battery problem. But can you explain why battery would be involved if the alternator is supplying the electrical power during operation? Thanks.

christopher6388: did all these but 2005 impala wont start random misfire has spark fuel air just cranks car seems to keep trying to turnover even when key isnot been turned any longer
any help is much appreciated

Jason Mateus: hello Scotty, awesome videos! my 02 dodge durango started misfiring when Id hear the rad fan start at idle,then it would be ok after taking off. It did that 3 or four times. Last time it never came back. So far I have swapped and replaced coils to no avail. I changed the spark plugs, nothing. Changed the TPS today and at least it does not stall at idle now but still runs like crap. Also changed the battery and EGR today. When I changed the plugs I found they all smelled like unburned fuel. I noticed exhaust fumes coming out from behind the engine. I am thinking maybe the cat is clogged and the smokes come out through the flange or something but there is still smoke coming out of the exhaust. The hotter it gets,the worse it sounds. PCM? Cats? Fuel filter? Why would it come back to life a few times and not anymore?It happened so many times in my maximas I knew Id just have to change a coil and off I went. But not with my beautiful mudder..

oleefree: i can't find any thing in play list abut EVAP system .i trust you and i won't learn from you .... sorry if i make a mistek in language am not good at english

james krouse: Had a misfire p0300 code with poor running car. Car would start but ran poorly. Scotty, you're the only one of 10 other videos I watched, that mentioned bad battery. Got under the hood and noticed corroded pos terminal and the battery was 6 years old. whoa! Replaced battery. Car ran like new, no codes. Scotty, Thanks brother. Love your videos!

Stevo K Atkinson: Hi Scotty very much liked your video. I have a 2007 Renault megane cc. Realised today it has a problem with power. Diagnostic OBE 2 says PO300 . Also there a squeaky noise when driving. Can you advise me please?

Ultimate Reality: Scotty is right, check the plugs first. However, one of my plugs had a 'carbon trail' running up the side of the insulator, causing misfire codes (po300,301,302 and 304) on my 98 Honda CR-V and causing it to run like total hell and my converter was glowing cherry red trying to burn off the excess gas in the exhaust (and I just paid 170 bucks for that new converter so you know I was worried.) Thanks, Scotty.

lorri thompson: And did a compression test all cylinders good

lorri thompson: Oh and put in new 02 sensor also

lorri thompson: I have a 2005 1.8 turbo Passat . We have been getting random misfires on all cylinders and lean codes. We have had vacuum leaks fixed, put in a new Maf sensor, new spark plugs and new coils. Still is getting same codes. Car was running real sluggish so we changed fuel filter but still getting codes but car has more power. We tested the fuel pump and its reading .08 , and by what I have read it should read 1-3. I'm tired of spending money on this car😩

ScorpioVenom: My car has the P0300 and ended up being a blown head gasket. Still trying to decide if its worth the effort to change it or just junk the car.

MXSLICK: scotty my 2001 camry v6 got this p0300 after revving the engine trying to pinpoint exhaust leaks myself. often, when coming to an idle at red lights after sprinted driving the idle falls low and it feels like its misfiring, but i feel its setting a p0300 just because the idle falls way too low and engine stumbles. any ideas?

Zulema Silva: hi scotty i drive a 2003 honda civic 03 and i have been having issues with my car it sometimes doesnt seem to have power, the car would shake when i first turn it on the check engine light has came on and have took it to a mechanic and he said it was the coils but i changed the coils and still same problem i already checked the spark plugs and their fine anything you can give would be appreciated.

Oscar Veliz: scotty i got a 2000 jeep wrangler 4.0l has random misfire changed coil pack cam sensor fuel pressure is at 30 psi which is goog but when i step on the accelerator pressure goes down would that be a bad or dirty fuel filter?

Alex Mckenzie: Also I changed fuel filter.

Alex Mckenzie: HELP!!!! Any one? 🤔🤔🤔What if u had code p0300 and smoking, specially at start up or when u start moving after stopping? Any help? ( 2003 mural) I changed the plugs and sparks but it did not help at all.

mimi taylor: why can i spry water instead of carburetor cleaner does it make a difference?

EMT: Thanks! They sometimes skip corners and take the easy way. If they ever did that, I suggest you consult with a paralegal or lawyer. This way they won't be able to cheat you.
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