Rep Power: 304

History: Car threw CEL when i was sitting in it at after school to head home. I reset the ECU and it went away. Next day, I started it up and as i was sitting there, it came back on...so here today:

So I borrowed the scanner from AutoZone, and I checked why my car was throwing the CEL

turns out these 4 codes showed up:

P0301: Cylinder 1 misfire detected
P0302: Cylinder 2 misfire detected
P0303: Cylinder 3 misfire detected
P0300: Random/Multiple Cylinder misfire detected

...I remember reading about another member having similar codes...timing belt anyone? I just want your guy's opinions before I have it worked on...

timing belts expensive right?

.....................

please see post #4.

 
Rep Power: 304

well i came back to my car after heading to work to pick up something i left behind...and when i restarted my car...the cel was gone..............

 
Rep Power: 0

You should start with replacing your spark plugs first. What is the milage of your car?

 
Rep Power: 304

well i checked the spark plugs as recommended...

and i pulled the coil out and found the third one to be brown and smelled like gas and exhaust...

pictures are attached...what should i do? replace it? bigger issue? safe to start it up?

i'm asking this now in hopes of having answer tomorrow morning before i fire it up

 
Rep Power: 246

Just out of curioscity what year is your car? I hope my 05 donstn start acting up!

 
Rep Power: 304

mines an 02

 
Rep Power: 300

mine came on after i started boosting, but after i put my mechanical o2 sensor on it stoped.

 
Rep Power: 314

I have posted to every one of these "MISFIRE" threads. No one case seem to diagnose it... From what I "HEAR" it's gona be a prosess of elimination for ya! I'll subscribe just to see what the admins says. This was the last one I subscribed to...http://www.7thgencivic.com/forums/sh...=247146&page=3

But this probily wont be the last post on this PROBLEM. O' I have an 02 with 55,000 MI and a misfire code every single day! Thanks to my OBD2 code reader I just erase the code and read these threads... My injectors look like that also but mines on cylinder 4 not 3...

 
Rep Power: 0

Mine was caused by a blow head gasket. I replaced it and the misfiring went away.
I changed the plugs, I cleaned the injectors, I tested the coil packs. It was the headgasket. Is your civic boosted buy any chance, or are you running an emanage?
from my experience if the emanage is hooked up not using the dezod harness, I have noticed alot of people with random cylinder misfires.

 
Rep Power: 304

my car's completely stock. i replaced the plugs last night and was hoping it would go away. but the coils came out brown like the pictures above.

how hard is it to replace the head gasket?

 
Rep Power: 314

see no advise is ever givin'... It's the phantom problem

My head gasskit is fine, I have new plugs and, my injectors are fine I think

 
Rep Power: 304

my friend said oil could've gotten in there...he said a head gasket would've spread to all cylinders. he's leaning towards a piston ring. but he said my best bet is to have honda look at it. so i've got an appointment tomorrow to have them take my left leg off so they can look at my car.

 
Rep Power: 314

Keep up posted PLEASE!!

How could you tell if your headgasket was blown?? No smoke is comm'in out of my exhaust, no oil is any where , nothing is diffrent?

 
Rep Power: 304

yeah well my CEL went away so i didn't bother to bring it to honda this morning. i'm planning on picking up another one of those coil packs to see if the discoloring will show back up after some driving.

i hope this was just a one-time fluke.

 
Rep Power: 314

It's not a fluke YOUR CEL WILL COME BACK IMO... I throw a misfire code every day and it comes back. Bet yours will too.

 
Rep Power: 0

OK, I've read all the thread and the ones that were associated and I came up with a conclusion that the timing belt might be slipped for one or two dents. But in this case, you should feel a slight loss of HP.

 
Rep Power: 812

mine was also head gasket. check the coils with a multimeter to see if they all have similar resistance. mine are all brown and smell like gas (and they all work fine). but stuff like headgasket shouldn't be happening.

 
Rep Power: 304

well the car's at honda. we'll find out what they want

 
Rep Power: 304

well apparently they couldn't tech the car with the "aftermarket" plugs i put on there from wal mart. anyway, they asked if i had them, because if i didn't they were gonna charge me a very cheap price of $21 per oem plug.

well my car was throwing 1,2,3 misfires only...when they did it, 1 through 4 was reading. so i bring the stock plugs back there and they put them back on, road tested the car for 15 miles and then no more codes.

it's been about a week now and no codes...what'd they do? i was wondering if they just deleted the code. if they just delete the code will it show up again if it's misfiring?..or because they deleted it, the ecu doesn't bother throwing the CEL anymore.

weird.

 
Rep Power: 314

No wait a week... it will be back! keep us posted!!

 
Rep Power: 304

see thats the thing. it has been a week and it's not coming back on. what could they have possibly done to keep it from not throwing anymore...cuz if it's still throwing the code but it's just being suppressed, then i want to know.

my friend said reset the ecu and see if it comes on again, should i?

 
Rep Power: 314

Every time I change my plugs (changed them 3 times under 60,000miles) it helps for "X" amount of time then one average day out of the blue "****" CEL is on

The only help I got was from (streetglower) I think that's his screen name . He told me it would be a process of elimation! Plugs, coil pack, valve adjustment, fuel, etc...




good luck!

 
Rep Power: 812

try copper ngk v-power plugs.

 
Rep Power: 314

Hmmmmmmmmm^^^^^