Cylinder 5 misfire UPDATE Broken valve spring

**Kasey** · 09-01-2011

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

Second scan as of now

If this gives any info.

video of how shes running
video-2011-09-01-21-24-48.mp4 video by CBRingKasey - Photobucket

**PurpleGuy** · 09-01-2011

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.

**OH4CompG** · 09-01-2011

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

**bps02gtp** · 09-01-2011

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.

**BillBoost37** · 09-02-2011

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.

**Explicit_Spade** · 09-04-2011

Originally Posted by BillBoost37

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.

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".

**Kasey** · 09-04-2011

Ill give it a try. Thanks

**bps02gtp** · 09-02-2011

i wish i had ALLDATA

**Kasey** · 09-04-2011

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.

**Kasey** · 09-04-2011

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

**Kasey** · 09-04-2011

think i got it

**Explicit_Spade** · 09-04-2011

The service manual is the GM ESI.

**Kasey** · 09-05-2011

So I swapped out the ignition control module, still nothing. Im troubleshooting everything else including shorts right now.

**OH4CompG** · 09-05-2011

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

**Kasey** · 09-05-2011

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.

**bps02gtp** · 09-05-2011

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

**Kasey** · 09-07-2011

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

Anyone think I could have a clog in my exhaust system?

**bps02gtp** · 09-07-2011

the clog would be in ur cat and i kind of dont think you would get only 1 cylinder thats misfiring.

**Kasey** · 09-11-2011

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.

**Scottydoggs** · 09-11-2011

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.