DrewMD

iTrader: (1)

Hello... again.

<U>Today's topic is</U>: Random Misfire.

<U>Car</U>: 2000 Honda Civic EX, D16y8

<U>Symptoms</U>: Car randomly misfires in cylinder #1 and sometimes cylinder #3.

<U>Items Replaced</U>: Plugs, wires, cap, rotor, dizzy, traded ecu's.

<U>Setup</U>: Password JDM carbon fiber intake, Manual tranny conversion.

<U>Time</U>: Has been occuring for about a month, have been autoxing on and off.

<U>Compression Test Results</U>: Cylinder 1: 180 2: 185 3: 180 4: 185

I need help. Lmk what else you should know or any suggestions. thanks.

DrewMD

iTrader: (1)

jeez, come on people.

devney

Get the ngks drew, get the ngks. I'm j/k, wish I could help.

burnitdown

are your wires secure? they could be randomly hitting something causing an arc. i had this problem some time ago. stumped me

slowcivic2k

Check for water in the cap, that happens a lot when people power wash their cars. Might want to check the BLK/YEL + wire to your dizzy coil for rust, if this gets corrosion in it, it will have a mid to high load miss. (mid to high throttle)

DrewMD

iTrader: (1)

My wires are secure. I just changed the cap and there was no water. but ill check the wiring.

Libertariat

Check your ignition timing and all of the ignition components.

DrewMD

iTrader: (1)

I might take a look at my injectors tomorrow and switch a few around. If I pull the codes using a scanner will it tell exactly what caused the light to go on?

DrewMD

iTrader: (1)

I swapped the injectors around so we shall see if that helps.

iNfAmOuS_E46

when was the last time you changed the head gasket

DrewMD

iTrader: (1)

never, my compression test results were good from what ive heard. i haven't done a leakdown test yet though.

why do you ask?

95DxSi-R2

lol, so what happened when u switched injectors?
miles on said vehicular......recently cleaned your engine?

iNfAmOuS_E46

my misfires got so bad it was like i was driving an sti found out later my head gasket was slowly messing up more and more until it was hard to start

DrewMD

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 95DxSi-R2 &raquo;</TD></TR><TR><TD CLASS="quote">lol, so what happened when u switched injectors?
miles on said vehicular......recently cleaned your engine?</TD></TR></TABLE>

I haven't driven on the switched injectors much. It hasn't randomly misfired yet. the car has around 54k miles. just did an oil change. i have not recently cleaned my engine.

Libertariat

Did you take a look inside the rotor/cap?

Is it pointing the way it's supposed to?

stock99si

hmmm, by the looks of it, your engines misfiring...


solution: drop a ls1 in that bitch

tx_ej8_49

Maybe a bad coil and/or ignitor(ICM)....?
Honda coil=poop (but will still work for 150k+, just not like it should) $45 dollars at o'rileys with a lifetime. Make sure the connectors are on tight and not slipped between the plastic and metal. Adn you should prolly swap one at a time just to be sure everything is right.

I also had a random misfire code and cyl 1 2 3 4 at idle but ended up being a combination of things.
1.OBX alt pulley...12.1 volts is NOT enough
2.mis-adjusted throttle linkage to compensate for low idle(see above statement)
When i put the stock pulley back on and adjusted my linkage, i installed a blox intake mani, cleaned injectors(150k), hondata intake gasket and a honda pcv(maybe 150k). My miss has been gone for months now...its great.

DrewMD

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ek forever guy &raquo;</TD></TR><TR><TD CLASS="quote">Did you take a look inside the rotor/cap?

Is it pointing the way it's supposed to?</TD></TR></TABLE>

I recently changed out the cap and rotor, and installed it correctly.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tx_ej8_49 &raquo;</TD></TR><TR><TD CLASS="quote">Maybe a bad coil and/or ignitor(ICM)....?
Honda coil=poop (but will still work for 150k+, just not like it should) $45 dollars at o'rileys with a lifetime. Make sure the connectors are on tight and not slipped between the plastic and metal. Adn you should prolly swap one at a time just to be sure everything is right.</TD></TR></TABLE>

I switched out my dizzy for my known working brother's dizzy from the same motor type.

I know I adjusted the throttle cable when my throttle body plate was sticking. But the cord is loose, not taught.

Figgy1682

how long ago did you do the tranny swap. i been told by my guy at honda that the egr valve can cause random misfires. i dont know if this is true but its what i been told before.since there is no egr now maybe that could be the problem.

DrewMD

iTrader: (1)

I did the conversion back in october. No problems since about 1 or 2 months ago.

minime-civic

check the boot around the p[art of the wire that touches the plug. and see if it isnt arcin in there becuase thats what happened to me once

Hybrid96EK

Just wondering, how exactly do you know its a misfire in cylinder 1 and 3 specifically?

slowcivic2k

Probably codes 70-74, each code represents a cylinder number, and the 70 is a random misfire all together that does not exactly occur in a specific order.

Hybrid96EK

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowcivic2k &raquo;</TD></TR><TR><TD CLASS="quote">Probably codes 70-74, each code represents a cylinder number, and the 70 is a random misfire all together that does not exactly occur in a specific order.</TD></TR></TABLE>

Code 70 is clearly displayed in the Helm as being a code for the automatic transmission (aka transaxle). I'd like to hear from the OP how he determined the misfire on those two cylinders still and not your speculation however...

slowcivic2k

Was wrong on the code 70, because the obd2 code for this is P0300 (random misfire) and codes 0301 to 0304 correspond to cylinders.