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Misfire at idle

 
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Old 03-09-2011, 10:57 AM
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Misfire at idle

I've been searching over the internet and I hate this crap. I'm sorry in advance lol

In the past my CEL has come on and flashed at me randomly after long distance drive or heavy load, after I come to a stop and let it idle. Would drive again and the flashing would stop and would not continue.

So now, the other day I turn my car on, it has a rough idle, not uncommon. But this time it starts flashing at me so I pull out the reader.
1491
300
301
302
303
304
1399

I start driving, it takes off rough but once I'm rolling it smooths out and the CEL stops flashing. Everything is normal until I return to a stop again and the engine idles. CEL starts flashing again. To my understanding this is because of the damage to the cat.

1491 is EGR, correct? About a year ago I was getting these codes before. It turned out to be the EGR was messed up. It was causing the misfire. I unplugged the sensors and, although the CEL was on, there was no misfire. Attempted cleaning it, but it didn't fix anything. So now I drive aroung without a functioning EGR. That's why that light is on.

When this was causing me issues I did change plugs, wires, distributer, checked the injectors. So it's not like I haven't replaced them in some time. I'm annoyed at the thought of having to do them again in such a relatively short period of time.

Due to the fact that it's only at idle I was thinking of some kind of idle air control sensor. But if this were the case wouldn't it be throwing it's own code???

At this point I'm desperate. I dread having to replace everything again just to single them out. And I know if I have someone else look at it they'll tell me to start there and charge me a rediculous amount for something simple.
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Old 03-09-2011, 11:34 AM
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Re: Misfire at idle

first off let me tell you that if your cel starts to flash, turn the car off immediately, when the cel flashes that means that the misfire is bad enough to actually cause damage to the engine, so don't run it or drive it if thats flashing. but if you are misfiring on all of your cylinders the problem is going to be something that affects something all the cylinders have in common. check for spark, check for good fuel pressure, and check your timing, and also there could be a vacuum leak somewhere. i've seen the cel throw a code for random multiple cylinder misfire because there was a massive vacuum leak, and that will affect all the cylinders because it messes with the air/fuel ratio to the point where the car doesn't even want to run. so check all your connections for your hoses too. what year, and model is yours?
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Old 03-09-2011, 11:45 AM
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Re: Misfire at idle

a p1491 is a code for insufficient egr valve lift, which means that the egr valve is probably almost stuck closed. the egr takes exhaust gas and routes them back to the intake and that lets them be "reburnt". if that valve is stuck closed you could be getting some nasty carbon deposits built up in your intake as well. you could just get a block off plate for the egr if you didn't want to get another one.

Last edited by vtec9998; 03-09-2011 at 11:48 AM.
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Old 03-09-2011, 03:44 PM
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Re: Misfire at idle

its a '99 SH.

Back when I was checking the EGR i had the fuel filter and pressure regulator replaced. I completely planned to block off the EGR, bought everything for it, except now I cannot get the nuts off, and don't know how to get them off. Every time I try the socket just pops off, slowly rounding it.

Someone said to me it may be the cat itself. Like it's getting clogged? I don't know anything about this.

At this point I've changed the plugs, can't find a store with the wires. Replaced the cap and rotor.

All have spark. Even though it runs rough, it isn't a true misfire.
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Old 03-09-2011, 05:53 PM
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Re: Misfire at idle

if you are having a problem with your cat it should set a code fairly quick, you should get a p0420 which a catalyst efficiency below threshold code. however i'm not saying that isn't a possibility that it could be getting clogged, but if it's bad enough to make the engine miss i would say it should have a code if its the cat. most of the time that code will set before you can ever notice anything about the drivability due to the cat. now the nuts on your egr are kinda hard to get to i know, get some PB blaster (its basically liquid wrench but better) you can find it at advance or auto zone or o'reilly's and spray that on the nuts and let it soak in for about 10-15 minutes, try to get them off after that with a swivel socket. to me it really sounds like a vacuum leak or a fuel pressure problem, if you're sure you have good spark then i would test my fuel pressure. i know you said you had the regulator replaced but if you're pump is going out you won't have good pressure.
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Old 03-09-2011, 08:31 PM
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Re: Misfire at idle

Don't know how to do compression and fuel pressure tests so I took it to Honda and they told me the compression is low in cylinder 1 and that the injector isn't functioning right. Plus they said they'd clean out the EGR system and take car of that for me.

I told my brother these things and he said the compression has nothing to do with the injector. I can't say one way or the other because this isn't something I've come across on my own to know.
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Old 03-09-2011, 09:11 PM
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Re: Misfire at idle

well you got codes listed up there that are for a misfire for all 4 cylinders, so I wanna know why they didn't tell you what was wrong with the rest of them...I would have told you the same thing about the possibility of low compression on one cylinder or a fuel injector if you had a misfire on just cylinder 1, but you had multiple misfires. i dunno what they're doing but i hope they aren't messin you up. let me know what you find out and good luck
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Old 03-09-2011, 09:21 PM
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Re: Misfire at idle

Me too.. I hate taking my car because I can't trust anyone, but in this aspect I can't do it myself and don't know anyone who can either.

They said they stethoscoped all the injectors and only found the first to be off. They're all getting replaced though.. so.... who knows.

I find myself eyeballing the ws6 ram air TA on a dealers lot....
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Old 03-13-2011, 01:24 PM
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Re: Misfire at idle

Above are mostly correct. The codes are for misfires in all cylinders, not just cyl #1. I would request what the compression numbers actually were and post them here. Most likely engine is loosing compression and needs rebuilt.


Your brother is wrong on the injector not causing low compression. If the injector is sticking open and washing down the cylinder it can ruin the piston rings. I have a newer F150 with the 5.4L engine in it that had that problem. One of my injectors stuck open and I drove it 30 miles to dealer cause they refused to tow it. In the 30 miles I washed down the cylinder wall enough it was scored, and bent the rod in that cylinder. Ford had to replace the engine engine under warranty for it($8,000). So, yes a bad fuel injector can cause low compression, depending on how the injector is bad.


Let us know what Honda says about it.

Yes, the WS-6 is a nice car. I owned several of the 1997-2002 Camaro SS's(sister car to the WS-6).
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Old 03-20-2011, 09:37 PM
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Re: Misfire at idle

Well Ive had the car back for a few days now and figured I'd tell you what happened. They replaced all injectors and all misfire codes disappeared. They cleaned the EGR ports but it didnt stop the insufficient valve lift code so I had that replaced and now all is well. No CEL or ATTS lights.

Since mentioning the WS6 I haven't seen it on the lot :(
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Old 03-21-2011, 07:48 AM
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Re: Misfire at idle

Welp, I completely jinxed myself. Both lights are back

And now they're gone again... I don't get it.

Last edited by CrudeLude; 03-21-2011 at 10:05 PM.
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