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Please help! cylinder not firing??

 
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Old 10-25-2012, 02:56 AM
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Please help! cylinder not firing??

Hey guys. Bear with me please, kind of long but i don't want to leave anything out that might be useful information for what you will see in the video. I just bought this car a while back. Engine was just rebuilt like 2000 miles ago by a member keeganmorgan on here, was surprised to find a build thread of the car. It has been giving me some issues and i'm really stumped here. And i'm low on funds because of this car and my high maintenance gf... otherwise i would just replace all that i question about the car, so i'm coming here in hopes of someone giving me some of their knowledge on this issue.

And BTW i don't consider this a idle issue.. because i was replacing some suspension components and while i was waiting for parts on order to come in(and them to give me the right parts after making 4 trips out) the car was sitting so i decided to clean the Throttle body, EGR, and IACV because of a fluctuating idle when not moving. There was tonnage of carbon built up on the screen of the iacv when i took it off, egr and throttle body weren't bad. So i was like "oh of course that's the problem right there" right. There was like a 16th of a inch of room around the carbon for the air to get by the screen.. and i used this less harsh than throttle body type of cleaning spray that a guy at auto-zone recommended for what i was doing, cannot remember what it was called. So once i get it all cleaned up i let it all dry, put it back together and start it up. And man did it run rough.



Theres a link to youtube because the site said i have a bad security token or something so it won't let me attach things. 20 to about 25 seconds in i was gasing it to get it running. It honestly feels, and smells like a cylinder(s) is not firing. The smell of fuel overwhelms you when it runs and it spits out of the exhaust when you let it run for a while.

Codes p0170, p0171. Which is running lean, and it had this code when i bought it. Upon searching i found that it is a bad O2 sensor. Don't know which one it is but the guy at auto-zone talked me into buying the lower one that is on the cat. Replaced that when working on suspension. Went in fine. Code is still there but i really don't expect it to go away until whatever is going on now is ironed out and it gets to run for a bit.

Then code p0401. EGR insufficent flow. This is a new code that popped up upon starting it for the first time after all of this. Which if i didn't smell fuel i wouldn't question. But i do, would the EGR being clogged(even though i just cleaned it) cause this?? EGR is almost 200 bucks, that's why i don't want to jump right into buying it if its not the problem.

My buddy and I's theory is that it is bad wires and/or plugs. We pulled wires and they are all corroded, some more than others where they attach to the plug. And its over 100 bucks for all of that, soooo. What do you guys think?

Thanks,

Last edited by Crewchief1; 10-25-2012 at 02:59 AM.
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Old 10-25-2012, 04:20 PM
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Re: Please help! cylinder not firing??

i would pick up new plugs, wires, cap and rotor especially if they are beat up. i usually get parts from rockauto, go with ngk or denso for plugs/wires. imho
the code wont go away unless you clear it with a scanner or disconnect the battery for like 30min i believe. someone correct me if im wrong.
there is a good egr cleaning video in the tech section that drills out some additional ports as well as spraying the egr valve, watch it
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Old 10-31-2012, 08:14 PM
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Re: Please help! cylinder not firing??

Alright, thanks for the reply. And sorry to sound dumb, but what's a cap and rotor?

Cleared all the codes and after running for a bit nothing came up. But the cart is obviously running super rich. Like so rich that it will die if i don't get on the gas so it had more air to play with.

My wires and plugs came in today so i just installed them and now is firing in all cylinders but it is still running like crap. I was wondering if any of this can be caused by my bad temp sensor? Because my gauge doesn't work.. And i haven't seen my fan run yet. So what if the engine thinks its super cold because of the sensor? Thus flooding the engine to try to compensate for the temp it thinks it is. And since it thinks its cold the fan never turning on. Does that sound possible?

And I'll go into a little more detail about this temp sensor later and why i don't just replace it. But heres a picture. I don't think its stock.. But until then what do you think about my diagnosis of the problem? I'm hoping that's it.
Thanks,
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Old 11-28-2012, 04:27 AM
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Re: Please help! cylinder not firing??

Alright so i got the problem with the engine misfiring fixed. The car actually had more codes than i thought it did, i just didn't let it run long enough for the computer to pick them up. Long story short it was misfiring in all cylinders because of a bad upper gasket on my intake manifold. And the picture of the sensor that i put up in my last post is called a thermal fan switch i found out.

Now the engine runs pretty well. Always starts right up no problems and gets going, but the problem that's bothering me now is that the idle is fluctuating. Usually when cold. But it will do it when its hot too, it just doesn't happen very often. I cleaned all the above stuff i talked about in the first post^^^^. But some more searching on the problem talked about the fitv being bad. So i watched some YouTube videos on problems with them and usually it seems that people just need to clean it up and screw it in more. So I cleaned it all up and bottomed it out where it goes in the throttle body, and it seemed to help a little bit. But it still fluctuates.



And the rattling in the video is something in the glove box that didn't want to quit bouncing around. And as you can also see in the video is that my temp gauge does not work.. I replaced the thermal fan switch and the engine temperature sensor. And no difference. Is there a different sensor that controls the gauge?? I found 2 different looking "temperature sensors" at different websites that i have no idea about in the car. Here is pictures of them. Hopefully one of these is the gauge sensor??..
http://i.imgur.com/zaJPj.jpg
http://i.imgur.com/ow5vs.jpg

And my engine codes are p0401- egr insufficient flow. p0130 and p0131 primary heated oxygen sensor (sensor 1) low voltage. p0171- fuel mixture lean. And the biggest one of all p0505- idle control system malfunction. Because i think that may be my idle problem. Is it talking about the Iacv or the Fitv? I pretty much have them looking like new. So i guess one of them is straight up broken..

thanks for any help guys. I really need it now

Last edited by Crewchief1; 11-28-2012 at 05:15 AM.
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