SOHC_civic_si

Hey,

I'm having this problem where my engine will misfire when I start it up, but ONLY when it's cold, or hasn't been running for awhile. As soon as it's been running for a little, it will not misfire and run completely fine. It's basically misfiring at idle when cold. I have changed the distributor cap and rotor, along with the plugs and wires. It's bizarre because it only does it during cold starts? The motor also at this point feels like it doesn't want to start and very slowly turns over and starts up. After it's been running for awhile, if I shut it down and start it up, it fires up no problem. It is throwing codes for misfiring if that helps. Please guys, and help?

SOHC_civic_si

I checked the gap on my spark plugs and they were a little off but not by much. Any help guys?

Former User

Regarding the slow cranking, it sounds like the battery is low. Start by cleaning the connectors and terminals and charging the battery.

Regarding the misfiring, you might want to try cleaning the IACV.

SOHC_civic_si

You think it could be the battery even after it starts after not been running for 3-4+ hours? I have read about trying that but I am a little scared. Where is it even located? And how would I clean it?

SOHC_civic_si

BUMP. come on guys I need help

SOHC_civic_si

.....

SOHC_civic_si

??

fastrc2

how long, like timewise, does it actually misfire when cold? and if you run it till its hot and good, and then shut it off for 5 or ten minutes, and restart, does it still miss?

Civic_07

He just said it misfires when it's cold...the iacv is located on the back of the intake manifold, theres a faq on how to do do it just search it up. But I don't know what that has to with misfire...but who knows right, worth a try!

Honda-Pilot

You need to do a compression check. Do a search on how to do it.
You might have a weak battery, but it's not your miss fire problem.

fastrc2

civic o7 the reason why i asked if its only when cold, or also when it site for a few minutes, is becuase if the injector is leaking, then when he shuts off the car, fuel dribbles out very slowly, and slowly cayuse on cyilender to miss, and gopes away after a minute of running, and thats why i asked, please dont but in to restate the obvious, that i was already questioning, i asked how long does it misfire, and per my above reasoning, you should see my question was justified. so also we can know if it could be fuel pressure leaking down fromt he injector, or if its only been happening for a little while, and he is concerned, and this is all on the same tank of fuel, then it could be water int he fuel, and when its been running, the currents int he tank of return fuel, are mixing it up the the water is no longer on the bottom and the miss stops.

SOHC_civic_si

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fastrc2 &raquo;</TD></TR><TR><TD CLASS="quote">how long, like timewise, does it actually misfire when cold? and if you run it till its hot and good, and then shut it off for 5 or ten minutes, and restart, does it still miss?</TD></TR></TABLE>

It misfires for about 5 minutes I would say when I start it up cold. Maybe A little longer if it's really cold outside. If I run it till it's at operating temp, shut it off, then start it back up, no it doesn't misfire, it runs perfectly normal.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honda-Pilot &raquo;</TD></TR><TR><TD CLASS="quote">You need to do a compression check. Do a search on how to do it.
You might have a weak battery, but it's not your miss fire problem. </TD></TR></TABLE>

How would compression affect this?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fastrc2 &raquo;</TD></TR><TR><TD CLASS="quote">civic o7 the reason why i asked if its only when cold, or also when it site for a few minutes, is becuase if the injector is leaking, then when he shuts off the car, fuel dribbles out very slowly, and slowly cayuse on cyilender to miss, and gopes away after a minute of running, and thats why i asked, please dont but in to restate the obvious, that i was already questioning, i asked how long does it misfire, and per my above reasoning, you should see my question was justified. so also we can know if it could be fuel pressure leaking down fromt he injector, or if its only been happening for a little while, and he is concerned, and this is all on the same tank of fuel, then it could be water int he fuel, and when its been running, the currents int he tank of return fuel, are mixing it up the the water is no longer on the bottom and the miss stops. </TD></TR></TABLE>

So you think I could have a bad injector (s)? And no it's been happening for about a month now. Not just on one tank of gas.

SOHC_civic_si

...

fastrc2

no everything i suggested is not traceable or related to engine compression, what i want to know now, is which cylender is missing, and the easiest way that i can explain to tell, is run the motor while it has the miss, and pull each ignition wire out of the valve cover a LITTLe, while listening, and you should be able to hear the "pop" of the arc when its trying hard to jump a huge gap from the boot to the plug, and either once you pull it back alittle or when the popping of the arc stops, the engine should get even worse or more rough, if that cylender was contributing to the running of the engine, do this to all 4 and let us know what cylenders have no change when you pull the wire off. if you do identify a cylender thats out, take note if you didnt hear popping like the others as you removed the wire, if the spark on that cylender seems doubtful, then shut it off, take the plug out, and take a length of wire from a good ground, to the threads of the plug, and put the plug intot he wire it was on fromt he ignition wires, and start the car, watch and note the coler/intensiy of spark you may or may not see jumping the plug. also, a quick way to verify your pickups, and injectors elctrically, is to take a long screwdriver, place the blade ont he metal of the injector body, and put the handle on your ear's ExternalAuditory Meatus thats the hole/ little nub that sticks out, and listenm to eh injectors click, how it clicks, and the volume, and compare all cylenders, if you dont hear it click on one cylender, then either the injector is jammed, or its not getting signal. do all of this and please report your results back

gerbs94integra

... im having the same problems! i read the codes. today it said i am missing in cylinder 1. i dont know what to do ether...