Misfire consequences

Can anyone tell me what happens if a misfire is ignored for an extended period of time? Thanks.

Kaboom!

What are you serious? Can you define kaboom?

Just replace the plugs, problem solved. You won't have to worry about what happens then. Best $10 you could spend.

I was being sarcastic about the kaboom haha..

But doesn't misfiring build up a ton of back pressure, and slowly deteriorates the inside of your engine? I'm sure one would be okay.. but definately should not be ignored (better safe than sorry). It's only if it continuosly happens, will it harm your engine in so many ways, I guess. I could be wrong about the whole thing, but I'm sure your engine won't go "kaboom".

You need to give us more details. Is the misfire happening in the low-end when opening the throttle, or in the high-end?

In general a minor misfire in the low-end (RPM) should not cause damage, you'll just expierience a rough ride. These misfires are usually (95% of the time) caused by bad plugs and/or wires, the rest of the time it's usually a bad coil/distributor. A high-end(RPM) mis-fire causes engine damage 99.9% of the time. Probable causes for high-end mis-fire are your running to lean, or the cam timing is off.

Damn, you kinda scared me, Blue.

The misfire is felt at the low-RPM range. I've had misfire readings for over a year. But I've never relaly been able to feel them. But ever since I got my car back, the engine has been real rough at idle. The idle speed has dropped alot too. I've changed the plugs before so I think that it's the wires.

I just wanted to make sure that nothing will really happen to the engine because I usually ignore the misfires. They eventually screw up the cat, right?

dude, i had like random missfiers for like 3 weeks, and i didnt care, one day i parked my car to go to work, after work, the car wouln't stay on for longer than 2 secs, it would shake and all i heard was like "clink, clink" i took it to the dealer "mitsubishi", the took my engine apart, and found like a metal piece indside my cylinder "the missfire was in cylinder 1", in cylinder 1, the wall was scratched up and the head was damaged.
i had to get an engine "a block and head" total was like $4,000

Damn, you kinda scared me, Blue.

The misfire is felt at the low-RPM range. I've had misfire readings for over a year. But I've never relaly been able to feel them. But ever since I got my car back, the engine has been real rough at idle. The idle speed has dropped alot too. I've changed the plugs before so I think that it's the wires.

I just wanted to make sure that nothing will really happen to the engine because I usually ignore the misfires. They eventually screw up the cat, right?


Dude. Really it is like ten bucks for some sparkplugs. Why would you want to drive around with it all fucked up when you can just fix it?

Also, if you are getting the RM CEL, the ECU is going to dump you into limp mode to protect the engine and the car will run like crap.

Best advice....fix your car.

Dude. Really it is like ten bucks for some sparkplugs. Why would you want to drive around with it all fucked up when you can just fix it?
Because I've already changed the plugs twice since it happened. And I just now got my car on campus so I have to wait until I have some time to go out and get plugs and wires.

Thanks for all the advice.

Did you make sure they were gapped correctly, or did you just throw them in? Makes a big difference.

Did you make sure they were gapped correctly, or did you just throw them in? Makes a big difference.
I'm pretty sure they were gapped right. I had the car taken in early on, but idk if they knew what he was doing or not. He said that it was just the plugs too. I plan on changing the plugs and wires soon.

Assuming someting was done is where problems start. Take them out yourself, gap them to .045"-.050", you have to play with it a little bit to find the sweet spot. It's different with every car. It's really not that hard or time consuming, maybe 20 min. at most if you've never done it before.

Dude, im having a crap load of problems from this Mis fire thing. Ive changed the plugs=nothing,gapped them=nothing,msd wires=nothing,checked timeing=nothing,vacuum leaks=nothing. if i were you i would take it to a mechanic that new more about DSMs. Mine is in the shop right now checking. I think mine may be the coil. But you need to get that check, it can blow your motor

One damage it could do is make your car run rich if that cylinder starts running again. That could damage an O2 sensor or the cat.

Holy Thread Revival! Last post was from 11 years ago, Are you serious? LOL