Code P0300 (muliple misfires)

[starfish]

started up car and started driving all of a sudden started misfiring like crazy.pulled a 300 code multiple misfiring.Any Ideas?

 

[DSMDriver69]

never heard of it, but im gonna guess you need to change your plugs and wires. Try that and get back to us.

 

[starfish]

just dropped in bosch wires and iridium plugs getting same misfiring.can a bad ignition switch cause code 300(multiple misfiring)?Ive been having problems with that but never made it misfire before.

just tried another coil pack,wires and plugs still nothing.starts up but wont run for shit!cant get any more codes out but the lite blinked once than 3 times then 5 times then 5 more times want kind of code coud that be

 

[starfish]

Would bad gas make a code 300(multiple misfiring) come up?I pulled in for gas,got $30 worth,and got about 1/4 mile when the trouble started.

 

[VelocitàPaola]

Please don't start multiple new threads on the same topic. I've merged your previous two here.

 

[starfish]

Are you trying to tell me that bad gas is related to my first problem?Thanx for the help!

 

[VelocitàPaola]

Are you trying to tell me that bad gas is related to my first problem?Thanx for the help!

Both of your threads concerned possible causes for "code 300 (multiple misfire) [sic]." I didn't mean to imply anything else.

 

[starfish]

how would bad gas make the motor do?Would it cause it to misfire in every cylinder?What could cause every cylinder to misfire?Anyboby have any Ideas?

 

[VelocitàPaola]

OBD-II Trouble Code: P0300 Random/Multiple Cylinder Misfire Detected

 

[starfish]

thanks for the help.that code side really gave me alot of options to figure this out.But unfortunatly I cant try any of those things on that site because I brought my ECM for a core exchange at a mitsubishi dealer.$450 for a reman from mitsubishi.It would of been nice if you gave me that information a day ahead of time and I wouldn't of even taken out my ECM.But I guess it was more important to play boss and correct me on double threading.I'm not doin this on purpase,I'm just not to good with a computer.What the hell is a blog?

 

[Locke]

This is a forum, sometimes answers take time. You can't expect that everybody with the answer is on the forum waiting for you at all times. That aside, as a Moderator, Paul's primary responsibility is keeping the forum pruned and threads within the rules. Moderators are often very knowledgeable and many times extremely helpful, but they don't know it all.

It would of been nice if you gave me that information a day ahead of time and I wouldn't of even taken out my ECM.But I guess it was more important to play boss and correct me on double threading.

1. It is his job here to play boss.
2. Nobody here is forced to be helpful, and most people won't want to be helpful to somebody with that apparent attitude.

That said, I'd start looking for damaged wires, (check wiring along EGR pipe) and busted or unseated connectors. If you have a scope check that the output of your crank and cam sensors correspond correctly. Make sure that you are getting good power to your coil, if your spark is anything but bright blue (nearly white) then you may have a power issue; make sure the circuit leading from B+ on the coil all the way to the battery has solid, clean connections and that the ASD isn't gummy. Go down the list that Paul linked you.

 

[starfish]

Im still waiting for my ECM from the mitsubishi dealer right now,but I was thinking about the mornin all the trouble started.I did wash my motor with Engine bright(degreaser).I had alot of grease aroud the sensor that is on the side of the valve cover,on the driver side of the motor.could that have done something to that sensor that would make the car have multiple misfiring?

 

[VelocitàPaola]

It would of been nice if you gave me that information a day ahead of time and I wouldn't of even taken out my ECM.But I guess it was more important to play boss and correct me on double threading.

Oh, gee, I'm sorry... I'll be sure to do your legwork for you at least a day ahead of time from now on.

It's no one's fault but yours for jumping to conclusions and purchasing a part you probably didn't need. For future reference, always try this first:

http://tinyurl.com/yav3d3q

Im still waiting for my ECM from the mitsubishi dealer right now,but I was thinking about the mornin all the trouble started.I did wash my motor with Engine bright(degreaser).I had alot of grease aroud the sensor that is on the side of the valve cover,on the driver side of the motor.could that have done something to that sensor that would make the car have multiple misfiring?

What's more likely is that water got between the spark plug boots and the valve cover causing a misfire -- that happened to me once. The only thing to do is pull the spark plug wires and let everything dry. Compressed air, if available, will significantly decrease the amount of time it'll take for everything to dry.

 

[starfish]

I though maybe the ECM because when the key is turned on I heard a hum that I never heard before.Or maybe its suposed to hum I just didn't know it.All ready tried 2 differn't sets of wires ,plugs,coilpack.I'm still thiking about bad gas(not me the car).Sunday mornin My wife and I pulled into the gas station and purchased $30 worth of gas.I pulled out nice and easy normal driving about 35mph.I got about 1/4 mile from the station when in started stutterin and poppin.Would bad gas give you a 300 code? I'm just not sure about that.

Also when I got the car home I erased the code to see if it would come back again,but it wouldn't.so I tried the turn the key back and forth method and I got a 1255.I couldn't find anything like that on any of the code site or in my books.

 

[VelocitàPaola]

I'm still thiking about bad gas(not me the car).Sunday mornin My wife and I pulled into the gas station and purchased $30 worth of gas.I pulled out nice and easy normal driving about 35mph.I got about 1/4 mile from the station when in started stutterin and poppin.Would bad gas give you a 300 code? I'm just not sure about that.

That would be exceptionally rare. Be sure to explore every possibility in that link I posted earlier. If you've replaced all of your ignition components, then look for EGR malfunctions, vacuum leaks, a bad catalytic converter, etc.

Also when I got the car home I erased the code to see if it would come back again,but it wouldn't.so I tried the turn the key back and forth method and I got a 1255.I couldn't find anything like that on any of the code site or in my books.

Nothing out of the ordinary there... Error code 12 means the PCM was lost battery power recently, and 55 signifies the end of the error code stream:

2GNT.com - PCM_Error_Codes

 

[starfish]

I don't think its my cat.Its a 3" Magnaflo and its only been on the car for three weeks.I have another EGR and tube from my original motor that I cleaned up real good.That might be the problem.the one on my motor was filthy so I cleaned all the grease off it with Engine bright.the morning that my car died.I also noticed behind my throttle body door was coated with thick black slug.So I plan on cleaning my original ITM real good and putting that one on.AS soon as I get my ECM ,I'm sure I'll figure this out sooner or later.Thanks for the help.If it is bad gas ,is there any thing that can be done with the station I bought it from?That never happened to me before.

 

[starfish]

$1200 and three days later I finally worked my way back to the fuel pump trying to figure this car out.So I pulled out my fuel pump and looked into my tank(which I filled the morning my trouble started).You can actually see 2inches of gas floating on nothing but water.I went and got a baster from my kitchen and sucked some from the bottom then sucked some from the top and put it in a clear glass.Looks like fuc--- salad dressing.So I when to the station and talked to the boss,and now I got to wait a couple days untill the inssurance guy comes to my house to tally up the damage.Unfuukin believable!!!$30 worth of water

 

[VelocitàPaola]

$1200 and three days later I finally worked my way back to the fuel pump trying to figure this car out.So I pulled out my fuel pump and looked into my tank(which I filled the morning my trouble started).You can actually see 2inches of gas floating on nothing but water.I went and got a baster from my kitchen and sucked some from the bottom then sucked some from the top and put it in a clear glass.Looks like fuc--- salad dressing.So I when to the station and talked to the boss,and now I got to wait a couple days untill the inssurance guy comes to my house to tally up the damage.Unfuukin believable!!!$30 worth of water

Again, please do not start multiple threads to discuss the same topic. I've merged your latest thread here.

 

[nuclearr]

I blew up a motorcycle that way. Only problem the guy who owned the station was the stepmothers borther-in-law. So I never persued getting it fixed.

 

[starfish]

I'm starting to make a list for the insurance guy for the things I already replace,but what else should I replace as far as the fuel system goes?

 

[VelocitàPaola]

I would replace at least the fuel filter and the fuel pump. Your biggest concern is making sure there's no water in the engine. I would at least remove the spark plugs to hopefully let any moisture evaporate.

 

[starfish]

The water wouldn't hurt the injectors?What I don't understand is the car would actualy run a little bit.there is only 2 inches of gas floating on top of a full tank of water.So just pull the plugs out?I want to leave the tank full untill the insurance guy comes.how about FMU,fuel lines,FPR

 

[starfish]

well I went to the station to get the inssurance info.the station was all blocked off.They were pumpin tanks.The company that delivered the fuel,delivered the wrong fuel.they filled the tanks at the station with METHANOL!!!Does any body know what kind of damage methanol can do to my motor?Today I have to call the claim person with the # I got from the station owner.My car is so screwed!

 

[VelocitàPaola]

I'm glad you're getting this sorted out. Like I said earlier, finding "bad gas" is exceptionally rare. Your insurance really shouldn't be footing the bill for any repairs you need, the gas station or its insurance company should.

Water or methanol shouldn't necessarily hurt the injectors. The FMU, FPR and fuel lines shouldn't be affected. I would definitely replace the fuel filter, but even the fuel pump might be okay.

 

[starfish]

The insurance guy from the gas station came to my house to look at the car.While he was there he called the mitsu dealer to se how much it would cost to flush out the fuel system and what would need to be replaced.After he came out of his car he showed me the paperwork.The insurance would pay for fuel system flush,replacement of filter,and labor$345.Fu--in rediculess!!!So I went to the police station and made out a full report,and decided to file a small claims case at the court house for the money that it costed me including loss of work 2 days,and the cost of a new ECM.I finally drained the tank and wiped it out real good.I went to another station and got 5 gallons of gas.After bleeding the fuel system real good,she finally started!I put some lucas fuel treatment in the tank also to help clean the injectors.The car just isn't the same.Stutters alittle and doesnt have the power like before.