Bent/Stuck valve?? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Morgan.13 · 07-25-2017, 08:22 PM

So the other day I was taking my father for a ride and I turned on a back road and decided to give it the beans. Went from first gear to second and then missed 3rd and accidentally put it back in first

Well shortly after, i got the stabilitrak service light and a CEL. Luckily enough i was only a mile or two from home. I scanned the CEL and got a P0305(misfire 5th cylinder) well after changing all the plugs and moving the coil pack around i still got a code for a misfire. Ive verified that i am getting strong spark. So that leads me to believe that i over-reved and possibly damaged a valve? Has anyone else experienced this?

2011 Camaro 1ss, long tube headers, flowmaster exhaust, CAI, hurst short shifter,Skip-shift eliminator, tuned.

miller8907 · 07-25-2017, 08:49 PM

pull the valve cover and the rockers on cylinder 5. I just had the same thing happen. Not missing a shift but the symptoms you described. Turned out to be a bent pushrod.

miller8907 · 07-25-2017, 08:52 PM

This is what i found. And a cracked lifter guide tray.

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Morgan.13 · 07-25-2017, 09:13 PM

Was it pretty obvious what was wrong when you initially removed the valve covers?

Morgan.13 · 07-25-2017, 09:33 PM

I got this far tonight, had to take care of some other things. Going to pull the rockers tomorrow and check the pushrods.

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frankwjr · 07-25-2017, 10:36 PM

The Wall...how high were the rpm's in 1st? you hope the p/r is just bent...also you still have the yellow beehives, you can upgrade to the GM blue or go PAC/PSI for additional future peace of mind...what is the mileage on the motor?

miller8907 · 07-26-2017, 01:45 AM

Quote:

Originally Posted by Morgan.13

Was it pretty obvious what was wrong when you initially removed the valve covers?

The rocker with the bad pushrod had some slop to it because the pushrod bending created some slack.

Morgan.13 · 07-26-2017, 05:17 AM

Quote:

Originally Posted by frankwjr

The Wall...how high were the rpm's in 1st? you hope the p/r is just bent...also you still have the yellow beehives, you can upgrade to the GM blue or go PAC/PSI for additional future peace of mind...what is the mileage on the motor?

I couldn't tell you exactly what rpm, it was just a pretty hard down shift. I'll look into the upgraded valve springs. Just passed 36,000miles the other day.

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Morgan.13 · 07-26-2017, 05:18 AM

Quote:

Originally Posted by miller8907

The rocker with the bad pushrod had some slop to it because the pushrod bending created some slack.

Okay. I'm going to feel around when I get home from work today.

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Morgan.13 · 07-26-2017, 01:19 PM

When removing the rocker, does the piston need to be at a certain point? Tdc? Or does it not matter?

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frankwjr · 07-26-2017, 04:44 PM

try to rotate the motor where both intake and exhaust look like they are full up...less spring pressure...only need to worry if pulling the springs...good luck take your time..

Morgan.13 · 07-26-2017, 06:48 PM

Instead of pulling the rocker, I ended up checking compression and doing a leak test. I ended up with 0psi in cylinder #5 and for comparison I did #3 and got 120psi. This was done with the engine cold. I then did the leak test on cylinder #5 and I can hear it leaking from the intake valve. I checked #3 and it's air tight. So looks like I'm going to be pulling the head off.

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Morgan.13 · 07-27-2017, 08:34 PM

Well found my problem tonight, looks like a bent pushrod. Very minor, thinking I can get away with replacing pushrods.

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chuckie669 · 07-27-2017, 08:51 PM

Dont even have to roll that across the table to see it ain't straight

07-25-2017, 08:22 PM	#1
Morgan.13 Drives: 2011 camaro 1ss Join Date: Jul 2017 Location: Wisconsin Posts: 92	Bent/Stuck valve?? So the other day I was taking my father for a ride and I turned on a back road and decided to give it the beans. Went from first gear to second and then missed 3rd and accidentally put it back in first Well shortly after, i got the stabilitrak service light and a CEL. Luckily enough i was only a mile or two from home. I scanned the CEL and got a P0305(misfire 5th cylinder) well after changing all the plugs and moving the coil pack around i still got a code for a misfire. Ive verified that i am getting strong spark. So that leads me to believe that i over-reved and possibly damaged a valve? Has anyone else experienced this? 2011 Camaro 1ss, long tube headers, flowmaster exhaust, CAI, hurst short shifter,Skip-shift eliminator, tuned.

07-25-2017, 08:49 PM	#2
miller8907 Drives: 2014 1SS/RS LS3 Join Date: Jul 2012 Location: Wisconsin Posts: 621	pull the valve cover and the rockers on cylinder 5. I just had the same thing happen. Not missing a shift but the symptoms you described. Turned out to be a bent pushrod. __________________ 2014 1SS/RS LS3 AGP TT, Custom TSP Cam, 4L80E Swap 1/4 mile- 9.53 @ 145mph

07-25-2017, 10:36 PM	#6
frankwjr Drives: 2010 SS 2SS M6 Join Date: Aug 2016 Location: Smithsburg, Md. Posts: 2,445	The Wall...how high were the rpm's in 1st? you hope the p/r is just bent...also you still have the yellow beehives, you can upgrade to the GM blue or go PAC/PSI for additional future peace of mind...what is the mileage on the motor? __________________ 2010 SS 2SS M6 - Tune by RDP dynoSteve!(Woot) - Daily Driver - *150K!* - All work by me...

07-26-2017, 04:44 PM	#11
frankwjr Drives: 2010 SS 2SS M6 Join Date: Aug 2016 Location: Smithsburg, Md. Posts: 2,445	try to rotate the motor where both intake and exhaust look like they are full up...less spring pressure...only need to worry if pulling the springs...good luck take your time.. __________________ 2010 SS 2SS M6 - Tune by RDP dynoSteve!(Woot) - Daily Driver - *150K!* - All work by me...

07-25-2017, 08:52 PM	#3
miller8907 Drives: 2014 1SS/RS LS3 Join Date: Jul 2012 Location: Wisconsin Posts: 621	This is what i found. And a cracked lifter guide tray. Sent from my SAMSUNG-SM-G920A using Tapatalk __________________ 2014 1SS/RS LS3 AGP TT, Custom TSP Cam, 4L80E Swap 1/4 mile- 9.53 @ 145mph

07-25-2017, 09:13 PM	#4
Morgan.13 Drives: 2011 camaro 1ss Join Date: Jul 2017 Location: Wisconsin Posts: 92	Was it pretty obvious what was wrong when you initially removed the valve covers?

07-25-2017, 09:33 PM	#5
Morgan.13 Drives: 2011 camaro 1ss Join Date: Jul 2017 Location: Wisconsin Posts: 92	I got this far tonight, had to take care of some other things. Going to pull the rockers tomorrow and check the pushrods. Sent from my iPhone using Tapatalk

07-26-2017, 01:19 PM	#10
Morgan.13 Drives: 2011 camaro 1ss Join Date: Jul 2017 Location: Wisconsin Posts: 92	When removing the rocker, does the piston need to be at a certain point? Tdc? Or does it not matter? Sent from my iPhone using Tapatalk

07-26-2017, 06:48 PM	#12
Morgan.13 Drives: 2011 camaro 1ss Join Date: Jul 2017 Location: Wisconsin Posts: 92	Instead of pulling the rocker, I ended up checking compression and doing a leak test. I ended up with 0psi in cylinder #5 and for comparison I did #3 and got 120psi. This was done with the engine cold. I then did the leak test on cylinder #5 and I can hear it leaking from the intake valve. I checked #3 and it's air tight. So looks like I'm going to be pulling the head off. Sent from my iPhone using Tapatalk

07-27-2017, 08:34 PM	#13
Morgan.13 Drives: 2011 camaro 1ss Join Date: Jul 2017 Location: Wisconsin Posts: 92	Well found my problem tonight, looks like a bent pushrod. Very minor, thinking I can get away with replacing pushrods. Sent from my iPhone using Tapatalk

07-27-2017, 08:51 PM	#14
chuckie669 Drives: 2011 ss Join Date: Sep 2015 Location: E-TX Posts: 764	Dont even have to roll that across the table to see it ain't straight