P0300 P0301 P0302 P0303 P0304

 

P0300 P0301 P0302 P0303 P0304

Now nowadays we are speaking approximately a misfire code so we're going to pass over some of various things to study such as the injectors which stay proper beneathneath right here we're going to communicate approximately the coil packs and the spark plugs we're going to do a compression check so there may be some of the various things you could do I'll start out with the very best after which shifting alongside to matters which might be a bit greater complicated now step one is Pinpointing which cylinder is misfiring you could inform there may be a misfire if the motors surely horrific idle it is shaking you'll absolutely understand if the auto is misfiring even without the test engine mild on so that is an experiment device in case 

you do now no longer have an experiment device simply visit your neighbourhood vehicle mobile elements and save a variety of instances they will examine the code without spending a dime and let's have a look at what we are managing right here so in my case I've p30 one it is a cylinder one Misfire so allow's pass beforehand and notice what is happening with cylinder one now the primary cylinder in my case is at the left-hand aspect or the passenger aspect so I actually have cylinders one 3 and 4 now I actually have plastic portions right here that I want to take away so we're going to first take away this phase and we're going to additionally take away this phase and get clean get admission to all of the elements that we want to 

paintings on now those are simply ten millimetre fasteners conserving on those plastic covers now the Flip aspect is you'll be wondering how do I discover cylinder one on my automobile or anything cylinder trouble you've got you can attempt Google Images a variety of instances you could quick dig up diagrams displaying all of the cylinder numbers in your automobile additionally go to a discussion board that offers especially together along with your automobile simply do some studies and normally you could have fulfilment as a substitute quick now allow me simply quick give an explanation for what you are looking at the proper lower back right here those are coil packs These are related immediately to the spark plugs which you 

will see in a second so that is coil per cent for cylinder 1 cylinder 2 cylinders three and cylinder four a bit ahead we've the gas injectors so if we've an injector for every cylinder primary cylinder quantity 3 and quantity 4 so the primary component and the very best component is swapping out the coil packs now the cause why I need to do this is I need To see if there may be a trouble with the precise coil per cent for cylinder one so what I'll do is simply take away cylinder quantity the coil per cent region it right here after which take this per cent and region it right here and begin the automobile now if the test 

engine mild comes lower back on displaying you've got got a misfire 4p 302 or cylinder then I understand the per cent is horrific and I want to update it so it is the quickest component you can do a variety of instances we've a problem code for Robin a misfire Just a coil going horrific however once more it can be some of the different matters so I'm simply doing away with this fastener which takes place to be a 10 millimetre after which there may be an electrical connection proper right here proper in which my thumb is there may be a tab which I must have eliminated first, however, it is k urgent the tab do that right here we pass after which and pull this out and that is your coil per cent now the opposite component you could quickly do 

because we are right here is test the Spark plug and in case you in case you've in no way achieved that earlier than that is only a spark plug elimination socket and the cause in the back of that is you need to look the situation of the spark plugs and at the give up of the socket is a magnet and there may be your spark plug and as you could see this one could be very very smooth now in case you take away the spark plug and it is all gunked up with oil particles it can simply be the spark plug additionally desires to get replaced But meaning you've got trouble maximum probable withinside the cylinder and we're going to communicate greater approximately that one whilst we do a compression Chuck so I've reinstalled the spark 

plug and I simply need to change out this injector now this coil per cent will region in cylinder primary k and that is the coil per cent from primary that turned into right here earlier than we're going to the region it proper right here so we're going to simply reconnect the whole thing begin the automobile and notice if There's an alternate withinside the problem code so that you pass for a check force you return back proper lower back and also you test the engine code or the problem code and if it tells you currently they have got a problem at cylinder 2 which might be 302 you then definitely understand the coil per cent desires to get replaced buy a brand new one and you are achieved nicely shall we embrace you do that check and you continue to have a 

the trouble with that identical authentic cylinder is what is the subsequent step k so now we are lower back below the Hood and do not be alarmed if those seem like I changed the form of an addiction of mine I simply grabbed a few crimson energy and simply smooth the whole thing up once more it is only an addiction I've been doing all the time however that being stated the subsequent component I need to confirm is that there may be energy attending to this coil per cent this can be a form of far-flung in different phrases I need to make certain that the wiring is in proper form this may additionally test the relay a variety of instances you've got relays that run those Coil packs and I simply need to confirm the whole thing is in proper form to 

try this I'm going to apply a virtual multimeter so that is what a multimeter seems like lots of you have already got any such in case you do now no longer they normally pass among twenty to twenty-5 bucks an absolute must-have in case you plan on doing all your personal vehicle mobile restore an awesome multimeter and an experiment device you could get plenty achieved so that being stated you've got some of the unique settings as you could see several various settings in this example we need the volts DC putting AC are family modern so that you do not need that make certain it is at the DC putting after which the multimeter has leads you've got got a black lead and a pink lead now black is floor this is going to an 

awesome metallic factor at the automobile now we're going to simply flip the ignition key to the on the role and confirm that we are getting energy right here so I'm simply going to show the ignition Don't begin the automobile simply flip it to the on role so I actually have the black lead going to floor the pink lead will visit the harness connector possibilities are you'll now no longer have trouble right here I'm simply doing this due to the fact perhaps your automobile turned into worried in a flood a collision perhaps you simply bought an automobile and if trouble constantly an awesome concept to test the wiring so allow testing the primary 

connection factor there may be no alternate once more we need to look 12 volts really well worth of energy Or battery voltage and there we pass so that verifies that we are getting energy to the coil per cent however in case you do that check you do not see an analyzing test the wiring you can or you'll have trouble with the wiring test additionally your relays especially the ignition coil relay now in case you're curious on in which the ignition coil relay lives normally they stay withinside the automobile and beneath neath the sprint so, for instance, I actually have a fuse some of the fuse places properly right here and if I Pulled off this plastic cowl I might see some of the unique relays so what I'll do in more than one days I'll 

comply with up on how to check an ignition coil relay however once more possibilities are you might not have trouble right here so we are on the factor in which we nevertheless have trouble with this primary cylinder we have got swapped out the coil packs that did now no longer remedy the difficulty you can even attempt swapping the spark plugs however in my case that spark plug turned into very smooth I understand that that isn't always an issue We understand that energy is attending to the coil per cent so surely ignition smart we are k however allow's attempt the gas or test the gas aspect of the equation so proper right here we've the gas injectors so that is the injector for primary so if I pull off this harness connector proper there as you could see we've prongs now I can check this injector with the multimeter so once more I actually have my multimeter now in this example I need to do ohms check that is a resistance check now

That's the Omega symbol on the multimeter okay so just hit my case I need the mode yes I did well maybe back past it yep there we go so right here that's the Omega symbol now I'm on that setting to test for resistance let me just try to set this up so everything is a 1 screenshot here just to make this easier let me grab some alligator clips ok so all that we're doing let me just zoom in here all that we're doing we're taking

The two leads from the multimeter and I will clean this up in a second and just touching the injector that's it and we should see it reading a good injector typically between 9 to 14 ohms and to make this easier on my end I tend to use alligator clips you don't have to use these but again just makes it easier but I do these videos to just hook up alligator clips so I'm just taking one end of the alligator clip directly to this guy this is really so you can see

Everything at once screenshot and then taking this guy to place it on the other end okay and again we should see 9 to 14 ohms let's see what we have okay so we have 12 ohms so that verifies that this injector is in perfectly good shape now in the past a couple years ago I did a video specifically on injectors and I had some comments that you cannot test injectors like this and in fact, you can this is what a dealer would do really back in the day before scan tools

Became so sophisticated but that being said if you don't trust this technique let me show you a different way now the flip side is you can test the injector while cranking the vehicle now what I mean by that is this fuel rail is attached to the engine with a couple of fasteners if I remove these fasteners this entire railing peels off and on the end of the injectors just an old ring to prevent any fuel from spilling on top of the engine so they come right off now

What you could do is a place that injector in a plastic bag zip tie the end of the bag and then just crank the engine now you don't want the engine to run so you can disconnect the coil packs so the vehicle won't start but you can just crank the engine and you should see fuel spill and really spit out of the injector you don't want it to leak it should be spitting out in a sense and if you don't see that the injectors bad well I will say these years

Ago I had an 1890 300 Z and within 18 hours two injectors went bad I tested the injectors using a multimeter one injector had no reading the other one was something like 900 ohms is way off the charts and I had to replace those two objectives so you can use the multimeter if you don't trust that technique then again just remove it place it in a bag and see what you have going on so just like we did with the coil pack we want to verify there's 12

Volts worth of power getting to the fuel injector now Sharon Cesare at this point you've pinpointed where the problem is typically it's the coil pack or the injector maybe the spark plug is shot but at this point, if you still have trouble there are only a few more things we can really check so at this point let's make sure that this is getting power because if it's not the fuel injector cannot fire so again I have the negative lead of the multimeter going to

The ground I'm on the volts DC setting and we should see 12 volts worth of power and there we go so that verifies power is getting to the fuel injector now again if you do this test and you're not getting a reading here check the wiring make sure everything is in good shape the other thing is checking the relay there's a fuel injection relay and I'll follow up within a few days regarding the relays but you want to verify that power is getting here so we verified

That spark is good we verified that the fuel is good but now we have to check any mechanical failure inside the engine or in other words wear and tear the only way to really do that is with or by a compression Chuck now to do the compression check I want to stop any fuel from getting to the engine so what I could simply do is pull the fuse or the fuel pump so if I take off this fuse cover again and let's find the fuel pump which

Is right there 1 2 3 4 to 15 amp on 2 3 4 This is it here so what we'll do is start the vehicle it may start just for a moment then it will quickly die and then we can go on to the next step so we'll attempt to start the car it may not even start sometimes they may start for a moment but just crank it ok that's good now what I'm going to do is remove all four coil packs and remove the spark plugs now when you remove the coil packs try

Not to mix them up I tend to keep everything as it was Jegs this is what a compression tester looks like you could typically rent these from your local auto parts store Amazon I believe has them for like 30 bucks a cron for example I'll have a link for you guys in the description box below but that being said this is just testing the healthy health mechanically of your engine the Pistons the Rings the valves

Things like that so as you can see we have several different adapters all that this is doing is matching up the threads of the spark plug that's all that's doing so in other words we're going to turn this where the spark plug lives inside the cylinder head now I'm expecting this to be perfectly fine if you pull your spark plug and it's just completely blackened up looks disgusting it's not the car isn't running right in other words you

Could tell because if this is all gunked up with oil you have something going on inside your engine so you need this is a good idea certainly to check if your spark plug looks horrible my case I'm expecting is still looking pretty good I don't think we'll have a problem here but let's just plug this in okay so again I'm just taking that adapter from the kit and you just want to place it where the spark plug lives so in this case, we're checking cylinder number one

The last thing we need to do is just open the throttle and we'll crank the engine so again this just goes on top okay now to keep the accelerator down I just have a 25-pound plate to keep that on top of the pedal the flipside is if you have someone to help you have them hold down the pedal and crank the engine so we're just going to crank the engine and see what the reading is this is a very healthy reading and just a testament to Honda's well known

Reliability they make excellent four-cylinder VTEC engines but that being said let's say you do this test and you're within 60 70 80 psi what you want to do is check the other cylinders as well to see if you can get a comparison but typically if you're well under 100 it's not very good what you can do is a wet compression test and I'd show this on a separate video we did regarding a 240z and you can really diagnose if you have a problem with the Rings the valves and

So forth but this is very very good and a very healthy reading now let's say you perform all of those tasks and you still have trouble what else can you check when number one is the fuel quality maybe the fuel is old the car has been sitting for some time you need to drain that fuel and apply fresh fuel now we have a separate article showing on how you can pump that fuel out of the fuel tank using a wet/dry vac it's not hard now if that

Does not work the next step is checking the fuel pressure now you need a very specific gauge which I do not have unfortunately but really you just attach this to the fuel system you start the vehicle and you look at the pressure and if the pressure you should be around 50 psi but if it's quite low then you need to pull out the fuel pump check the filter and the fuel pressure regulator chances are if you have this trouble

It's either the coil pack or the injector but nonetheless, you can check these other things as well now very quickly you may be thinking why did I have the trouble coat on I did not I'm just doing this as a how-to in my case I just disconnected the harness connector so I can get that trouble code and show you the steps on how to test everything but again chances are the coil pack or the dr. but go through these steps you can

Pinpoint where the problem is so thank you for reading any questions or comments please leave them below we'll see you next