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help: misfire

 
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Old 04-12-2011, 09:28 PM
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help: misfire

so i originally thought it was just 2-3k hesitation from the egr valve/ports, but recently my car started throwin a cel for a cylinder 1 misfire. it idles rough but runs pretty smooth other than that besides the occasional hesitation, i just did plugs and wires and a seafoam treatment about two weeks ago. anybody have ideas on wat it could be?
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Old 04-12-2011, 10:09 PM
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Re: help: misfire

How many miles are on the car?

If over or around 120k than it's time for your EGR to be cleaned.
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Old 04-12-2011, 10:12 PM
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Re: help: misfire

almost 170k, i know it needs cleaned but would it cause just one cylinder to missfire and the check engine light to be blinking(i know blinking means misfire).it idles really rough
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Old 04-12-2011, 10:52 PM
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Re: help: misfire

Yes, everything you have mentioned is an exact match as to what happens when the EGR needs to be cleaned (if it's never been done before).


at least 1 cylinder missfire, typically cylinder 1 or 3
higher / rougher idle
check engine light


Be sure to have new iridium spark plugs ready if you've not replaced them yet. The entire process isn't that bad if you have the proper tools to do it yourself.
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Old 04-12-2011, 11:39 PM
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Re: help: misfire

would blocking it off be just as effective?
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Old 04-12-2011, 11:44 PM
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Re: help: misfire

Depends on how your inspection is.

I'm honestly not too familiar with blocking it off since I'm required to keep it for inspection. I would think the ports need to be cleaned either way though?
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Old 04-12-2011, 11:49 PM
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Re: help: misfire

ok i think i know how to do it so its easy to unblock for inspection but idk bout the ports needing to be clean still, thx for the help
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Old 04-13-2011, 12:07 AM
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Re: help: misfire

You need to actually clean your EGR ports, not just the valve.

ENG: Cleaning EGR Valve/Ports video
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Old 04-13-2011, 12:24 AM
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Re: help: misfire

i know that, i was wonderin if blocking it off would be just as effective as cleaning the valve and the ports cuz its alot easier
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Old 04-13-2011, 09:35 AM
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Re: help: misfire

Im curious as well. I've heard of people having good luck with engine efficiency by eliminating emission controls and such. I have no inspections where I live.
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Old 04-13-2011, 01:46 PM
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Re: help: misfire

Well, too see if the EGR is causing the problem. Unplug it. WOW, that was hard right? If unplugging it helps, you've solved your problem, if not, then looks somewhere else, like the ignition coil or module.




To help answer nevrdun's question, I'm providing some basic EGR knowledge. Take it or leave it.

The EGR valve is there to reduce Nox Emissions (oxides of nitrogen that form at temperatures above 2500 degrees).

It does this by recirculating some exhaust gas (which is inert and therefore cannot be burned) back into the cylinder with your air/fuel charge.

Circulating exhaust back into the cylinder reduces NOx emissions by keeping cylinder temperature DOWN. This is because the exhaust gas cannot be burned again, making for a cooler burn. Removing the EGR will cause combustion temperatures to go up, which can cause overheating and spark knock. However, I don't know of too many Preludes with blocked off or disabled EGRs that have this problem. Why? Because we use 93 octane gas, which has a much lower spark knock index than many other vehicles running 87, which also equates to cooler combustion temps.

The EGR also helps to alleviate pumping losses, which is the amount of time it takes for the A/F charge to enter the cylinder. Thats because 6-10% of the cylinder is being comprised of exhaust gas, so it takes less time to fill with fresh A/F charge.


Also keep in mind that the EGR valve is only open (letting in exhaust) during CRUISE and LIGHT LOAD conditions. It is closed and therefore not working during IDLE and WOT (including heavy load conditions). Do you really need 100% A/F charge and maximum power when you're cruising on the highway?

And as to whether or not it will help with engine efficiency, you need to be more specific. Will it increase VE (volumetric efficiency)? Well yes, as you will be getting more fresh A/F charge in the chambers, which will give you more power under certain conditions. Will it be more gas efficient? Hell no.
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Old 04-13-2011, 02:08 PM
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Re: help: misfire

Very very informative. Thank You!
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Old 04-13-2011, 02:43 PM
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Re: help: misfire

Yup. Sorry if its a bit...clustered. I haven't been able to write a straightforward or coherent thing all day.
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Old 04-13-2011, 02:44 PM
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Re: help: misfire

May I direct you toward the "drunk check in" thread lol!
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Old 04-13-2011, 10:19 PM
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Re: help: misfire

thax for all the info. so wat you are tellin me is that my extremely rough idle isnt due to the egr valve cuz the system isnt in use at idle?
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Old 04-14-2011, 10:49 AM
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Re: help: misfire

no that isn't what im saying. under normal conditions it is not in use during idle. yours may be, which would cause problems. i'll have more information later when i'm on a real computer and not busy.
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Old 04-14-2011, 10:53 AM
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Re: help: misfire

If your EGR valve is stuck 'open' is causes a vacuum leak which will cause a sh!tty idle.

You should do yourself a favor and read this thread very carefully.
the FINAL idle problem thread!!!!!
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Old 04-17-2011, 11:59 PM
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Re: help: misfire

Idle problem could be from the EGR or you could always try pulling off the IACV (idle air control valve) it will be causes of rough idle, bounce idle, etc.. Heres a link about it.

*** How-To*** Clean Your FITV aka Fast Idle Thermo Valve - Honda-Tech
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Old 05-01-2011, 10:05 PM
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Re: help: misfire

Quote:
Originally Posted by hall756 View Post
so i originally thought it was just 2-3k hesitation from the egr valve/ports, but recently my car started throwin a cel for a cylinder 1 misfire. it idles rough but runs pretty smooth other than that besides the occasional hesitation, i just did plugs and wires and a seafoam treatment about two weeks ago. anybody have ideas on wat it could be?
Do a search click on in title only Type in " Top engine clean " that will take are of it there are videos somewhere in that thread I had the same problem. It is too much carbon build up on the top of the valve and its not allowing the valve to seat properly and that is where your misfire is. Mine took two treatments not one right after the other period of a month or two between. But since I am no longer having misfire issues. I always run 93 octane too so it will take something as drastic of this to fix it. Run the seafoam thru the power booster line believe me it works.

Top Engine Clean

Ah there is the link,, good luck
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