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Author Topic: cyl #4 misfire....?  (Read 2522 times)
Chris Green
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cyl #4 misfire....?
« on: February 22, 2006, 01:01:39 AM »

I had a high idle problem for a little while, and my buddy helped me out and noticed someone had put a little section of vaccum hose over that little metal stopper for the throttle cable.   

Now it idles fine, but throws a P0304 cylinder #4 misfire and idles kind of rough.  any common solutions to this?  I don't get how it was not showing misfire while idling high but it shows now...??

Chris
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Darktengu
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Re: cyl #4 misfire....?
« Reply #1 on: February 22, 2006, 01:07:40 AM »

Check your plug and wire on the 4 cylinder.  If that's fine put some injector cleaner in your tank, run it.  Maybe a fuel injector problem.  Reset your computer and see what happens.
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Chris Green
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Re: cyl #4 misfire....?
« Reply #2 on: February 22, 2006, 06:00:51 AM »

computer reset won't work, and I already ran some of the NAPA pass DEQ/hardcore injector cleaner stuff through it.


you can only feel it miss at idle if that helps, I swear it feels just like it did before it threw the code once you get going.


already tried swapping to a different set of wires so I will see what is going on with the #4 plug and post results,

Thanks,

Chris
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Chris Green
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Re: cyl #4 misfire....?
« Reply #3 on: February 22, 2006, 07:08:23 AM »

they looked fine, i put a new set in and it did nothing....
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Cellfae
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Re: cyl #4 misfire....?
« Reply #4 on: February 23, 2006, 01:30:15 AM »

when that happened to me, I replaced the plugs, and looked for any vacum leaks, that worked for me. Try that? Mine needed an entire tune up, because of the misfire.
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Chris Green
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Re: cyl #4 misfire....?
« Reply #5 on: February 24, 2006, 03:44:36 AM »

Checked compression to see if anything serious was wrong and because I was curious:

Cyl 1    175
Cyl 2    175
Cyl 3    173
Cyl 4    175

So does this mean all is well and it is some electrical gremlin causing my misfire?

Chris
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Darktengu
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Re: cyl #4 misfire....?
« Reply #6 on: February 24, 2006, 03:55:56 AM »

You said you swapped the wires, but what about the plug?  Otherwise it's probably a sensor, or your (eeeek) ECU
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Re: cyl #4 misfire....?
« Reply #7 on: February 24, 2006, 05:06:00 AM »

It has new plugs, wires, IAC valve, valve cover gasket, throttle body gasket.

I'm gonna try a new coil-pack..

Also, what is the thing on the right front side of the valve cover?  seems like a sensor that has oil pass through it?  It looks like its leaking right there... is this my problem possibly?

Chris
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Darktengu
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Re: cyl #4 misfire....?
« Reply #8 on: February 24, 2006, 07:05:13 PM »

Its your cam position sensor, and yes it could be a problem.
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Re: cyl #4 misfire....?
« Reply #9 on: February 24, 2006, 11:58:38 PM »

Cool, and I guess oil does not pass through it lol.  It just got leaked all over until I got the valve cover gasket changed.

So I took it off and cleaned it up as best I could but the male connector that plugs into it is also covered in oil... I'm not an expert but my cam sensor is not getting good readings because of this, correct?

I doubt my ECU is broken, its just kind of weird how it did not detect a misfire until I fixed the high idle.

Thanks for replying to all of my posts Darktegu  Grin

Chris
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Darktengu
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Re: cyl #4 misfire....?
« Reply #10 on: February 25, 2006, 12:00:44 AM »

I like to help, and like it more to find out what's wrong.  It's possible that the oil was messing with it, but not real likely.  Yeah it's possible that the owner before you put that vacuum hose on there because of the misfire.  How high were you idling at?
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Derek
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Re: cyl #4 misfire....?
« Reply #11 on: February 25, 2006, 03:25:37 AM »

I'm going to guess about three grand... that's my final answer.
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Darktengu
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Re: cyl #4 misfire....?
« Reply #12 on: February 25, 2006, 03:38:21 AM »

Yeah that's no good.  A shotgun slug is a good fix for just about anything though.  I guess we'll see how it works when you get the Cam position sensor cleaned up.
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Chris Green
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Re: cyl #4 misfire....?
« Reply #13 on: February 25, 2006, 09:36:42 AM »

Idled between 1,300 and 2,000 (real erratic)

I took the section of vaccum hose off the stopper for the throttle and now its real steady 900-1000

Cleaned the CAM sensor but it didn't make a difference, maybe because the connector for it is still covered in oil?

Chris
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Darktengu
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Re: cyl #4 misfire....?
« Reply #14 on: February 25, 2006, 08:11:38 PM »

if you have an air compressor, shoot some air in there and try and blow out all of the oil.  If you don't take it to a shop and ask them to blow it out.
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