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Cylinder 5 misfire UPDATE Broken valve spring

K

Kasey

New member
UPDATE NEAR THE BOTTOM




Ok so I romped on it a few days ago and right after it ran really rough. Like it was completely missing a cylinder. When I first scanned it I had a bunch of different codes. (pic will be below). SES light is blinking. Now its saying cylinder 5 but I checked the wire and the plug and looked and it had a good spark. So any help with my problem would be appreciated guys. Thanks.

First scan
2011-08-31204803.jpg



Second scan as of now
2011-09-01212853.jpg


If this gives any info.
2011-09-01212926.jpg




video of how shes running
video-2011-09-01-21-24-48.mp4 video by CBRingKasey - Photobucket
 
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Re: Cylinder 5 misfire, very rough, with vid

Try switching the wire with another. If you still have a #5 miss then it's obviously not the wire. I'd try switching coil packs then.
 
Re: Cylinder 5 misfire, very rough, with vid

That P1362 on cylinder 2 bugs me. 5 and 2 are on the same coil pack. Swap coil packs with another and see if the misfire moves
 
Re: Cylinder 5 misfire, very rough, with vid

it takes 2 seconds to swap a wire and/or coil pack so try that. typically when i have a light blink at me while driving, its fuel issue or really bad spark and with the given codes i would try the spark stuff first.
 
Re: Cylinder 5 misfire, very rough, with vid

Googling 1362 and 1361, you have what appears to be a bigger issue than just a coil, plug wire. Maybe a bad ICM or wiring. I'd want to look at the diagnostic aids in Alldata or GM ESI to see what they suggest these to be caused by.

Should be a simple fix once we see what those are.
 


Re: Cylinder 5 misfire, very rough, with vid

Ok, so I switched the plug and wire and still nothing. I see it has great spark and it smells like it has plenty of fuel so im still kinda stumped. also switched the coil packs and the misfire stayed at 5.
 
Re: Cylinder 5 misfire, very rough, with vid

BillBoost37 said:
Googling 1362 and 1361, you have what appears to be a bigger issue than just a coil, plug wire. Maybe a bad ICM or wiring. I'd want to look at the diagnostic aids in Alldata or GM ESI to see what they suggest these to be caused by.

Should be a simple fix once we see what those are.
Click to expand...

Reread this.

If you need the GM ESI, its on GPONA, register if you haven't yet, its at the top of the page under "service manual".
 
Re: Cylinder 5 misfire, very rough, with vid

Hey man I cant find how to get to GM ESI? any help? Im at the service manual part
 


Re: Cylinder 5 misfire, very rough, with vid

So I swapped out the ignition control module, still nothing. Im troubleshooting everything else including shorts right now.
 
Re: Cylinder 5 misfire, very rough, with vid

How did the old spark plug look? Worst case scenario you popped a ring land on that piston. The other possibility is you have a bad fuel injector on that piston. Since everything electrical checks out that's all I got
 
Re: Cylinder 5 misfire, very rough, with vid

the codes im getting say its something electrical. I think its running in bypass mode or whatever it is and thats why it will run but real ****ty.
 
Re: Cylinder 5 misfire, very rough, with vid

i ususally lean towards injector too but those have their own codes along with if those injectors are having electrical problems.
 


Re: Cylinder 5 misfire, very rough, with vid

I ohmed out the injectors. All of them checked out good.


Anyone think I could have a clog in my exhaust system?
 
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Re: Cylinder 5 misfire, very rough, with vid

the clog would be in ur cat and i kind of dont think you would get only 1 cylinder thats misfiring.
 
Re: Cylinder 5 misfire, very rough, with vid

So turns out theres no pressure coming from no 5 cylinder. Im going to look for the reason now but if anyone wants to jump in go ahead.
 
Re: Cylinder 5 misfire UPDATE no pressure in cyl

pull the valve cover and check to see if the rockers are on and working. could be a bent push rod, busted valve, chipped piston, whole bunch of different stuff could be wrong. start with the valve cover and rocker inspection.
 
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