***blown MOTOR?*** - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

streetdreams5520 · 02-22-2015, 10:51 PM

hey i normally check the these forums but im mostly on ctsvowners but im having an issue i cant fix. hopefully u guys can help me out

so for past 2 weeks car started to feel like it would hit some sort of boost cut, shudder or misfire. i thought it was because i had br6 plugs and that they were crapping out. i then bought ngk br7 plugs and drove to my tuner to check them out. he started to check the car out and stated the hptuners said there was a misfire in bank 1. He swapped the plugs(old plugs were good no oil etc, looked fine) = SILL MISFIRE then swapped the coils= SILL MISFIRE. He then came to a conclusion that it may be rocker arms springs etc. And he sees no indication of blow by. BEFORE i give him the go ahead to check the head, is there anything i should check?

is it possible it can be the head and why?
THANKS

checked the valve train on bank 1 looks good.

im thinking i have to do leak down test...maybe its the bottom end but at 40k? and 500whp(mustang dyno)?

mmarx82 · 02-23-2015, 07:23 AM

Sounds fishy to me, I would still suspect the coils. When you say he swapped the coils did they swap the coils around that were already on the car or did he put a new coil in?

We had one guy here who had a similar issue, His plugs looked melted. I know you already switched yours but can you post a picture of them?
http://www.camaro5.com/forums/showthread.php?t=391419

What mods do you have and any other pertinent information you could provide that we could use to help you?

3400 · 02-23-2015, 08:22 AM

sounds like he narrowed it down to cylinder 1, you are going down the right path the next step is narrow it down more, remove the valve cover and verify the rockers - springs rotocoils - lifters - Cam etc are intact etc... then a leakdown/compression test would be the next step if the above check out.. possible that you could have a burned valve or broken ring...

question - does the miss fire noise only appear in the exhaust? or can you hear a pop in the intake?

streetdreams5520 · 02-23-2015, 08:43 AM

thanks guys really needing some help here.he said it was BANK1=all 4 cyl but ill verify in a few
put new plugs in and he swapped all 4 coil packs from passenger side to driver side and problem persisted.
that is how he ruled out coils.... maybe wires? but doubt it

took off bank1 valve cover pushed down on the springs no movement i watched bank1 while car was idling for few seconds everything was moving nicely.

leak down test now?
what else would cause this? nothing else i can check?

thanks for help guys im trying to figure this out before i have to take it into a shops

Stephen12ZL1 · 02-23-2015, 08:44 AM

check vacuum too. Compression/leakdown test to verify the rings are sealing. If the engine is "blown" one of these parameters will not be in the normal range.

streetdreams5520 · 02-23-2015, 08:47 AM

btw my plugs are very normal looking i should've taken pics ....but im sure they are good

my problem come on when i give the engine load(boost) etc

Stephen12ZL1 · 02-23-2015, 09:05 AM

probably not blown then. Make sure all of the plug leads are fully clicked in. Take them off and reinsert. It is easy to get the boot on and the lead is not clicked. Double check the plugs to make sure the porcelain is not cracked somewhere. This is the most likely scenario.

97ChameleonTA · 02-23-2015, 09:09 AM

So, what you are saying is he is seeing misfires for cylinders 1, 3, 5 and 7? And your plugs all look okay? Have you compared them to the bank 2 plugs? I would suspect something loose in the coil harness connection for that side if that is the case. Or, possibly an O2 sensor issue that is causing that side to run too lean.

HDRDTD · 02-23-2015, 09:43 AM

I know this may sound strange, but what about a blown/clogged cat on that side?

NicKey · 02-23-2015, 10:00 AM

Check your plug wires on bank one, before you do anything else. You checked plugs and coils but not what is in between them.

streetdreams5520 · 02-23-2015, 10:49 AM

The tuner hasn't been picking up the phone so I can find out if it was one particular cylinder.... but he made it seem like it was all of bank 1. How likely are all the wires bad on that side? Or how likely is that whole side of engine is bad?

My mods are
cat delete,
Full exhaust
63 lbs injectors
15 lbs of boost
(Upper and lower)
I have the lingenfelter 650 kit
I got it retune I made 500/510 mustang dyno

streetdreams5520 · 02-23-2015, 10:50 AM

I'll check the wires but I would need to get new ones as I have efi live and supposedly it doesn't detect a miss fire like hptuners

Redlineviper · 02-23-2015, 11:16 AM

My buddy had a similar misfire and it ended up being an injector plug that did not have good contact.

kgendron71 · 02-23-2015, 11:31 AM

Check all connections for moisture.

02-22-2015, 10:51 PM	#1
streetdreams5520 Drives: 11 cts-v coupe Join Date: Dec 2014 Location: nj Posts: 31	*blown MOTOR?* hey i normally check the these forums but im mostly on ctsvowners but im having an issue i cant fix. hopefully u guys can help me out so for past 2 weeks car started to feel like it would hit some sort of boost cut, shudder or misfire. i thought it was because i had br6 plugs and that they were crapping out. i then bought ngk br7 plugs and drove to my tuner to check them out. he started to check the car out and stated the hptuners said there was a misfire in bank 1. He swapped the plugs(old plugs were good no oil etc, looked fine) = SILL MISFIRE then swapped the coils= SILL MISFIRE. He then came to a conclusion that it may be rocker arms springs etc. And he sees no indication of blow by. BEFORE i give him the go ahead to check the head, is there anything i should check? is it possible it can be the head and why? THANKS checked the valve train on bank 1 looks good. im thinking i have to do leak down test...maybe its the bottom end but at 40k? and 500whp(mustang dyno)?

02-23-2015, 07:23 AM	#2
mmarx82 Drives: '12 ZL1 #1609 Join Date: Feb 2010 Location: Georgia Posts: 1,762	Sounds fishy to me, I would still suspect the coils. When you say he swapped the coils did they swap the coils around that were already on the car or did he put a new coil in? We had one guy here who had a similar issue, His plugs looked melted. I know you already switched yours but can you post a picture of them? http://www.camaro5.com/forums/showthread.php?t=391419 What mods do you have and any other pertinent information you could provide that we could use to help you? __________________ Life is too short to drive cars that suck. My build Thread

02-23-2015, 08:44 AM	#5
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,809	check vacuum too. Compression/leakdown test to verify the rings are sealing. If the engine is "blown" one of these parameters will not be in the normal range. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

02-23-2015, 09:05 AM	#7
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,809	probably not blown then. Make sure all of the plug leads are fully clicked in. Take them off and reinsert. It is easy to get the boot on and the lead is not clicked. Double check the plugs to make sure the porcelain is not cracked somewhere. This is the most likely scenario. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

02-23-2015, 09:09 AM	#8
97ChameleonTA Drives: 2013 ZL1 Convertible Join Date: Oct 2013 Location: Valrico, FL Posts: 515	So, what you are saying is he is seeing misfires for cylinders 1, 3, 5 and 7? And your plugs all look okay? Have you compared them to the bank 2 plugs? I would suspect something loose in the coil harness connection for that side if that is the case. Or, possibly an O2 sensor issue that is causing that side to run too lean. __________________ 2013 ZL1 Auto Convertible - BRM Best: 10.829@127.15 FI Interchiller, Roto-Fab CAI, Big Gulp & Res, 9.1/2.5 Pulleys, PB&S, DeatschWerks 1500cc, Fore triple pump, Pfadt LT's, RD HX, MT DR's New times to come with E85 2016 2SS Auto - Hyper Blue Metallic Roto-Fab CAI

02-23-2015, 08:22 AM	#3
3400 Drives: 2013 2LT/RS Join Date: Oct 2012 Location: Wa Posts: 191 View My Garage	sounds like he narrowed it down to cylinder 1, you are going down the right path the next step is narrow it down more, remove the valve cover and verify the rockers - springs rotocoils - lifters - Cam etc are intact etc... then a leakdown/compression test would be the next step if the above check out.. possible that you could have a burned valve or broken ring... question - does the miss fire noise only appear in the exhaust? or can you hear a pop in the intake?

02-23-2015, 08:43 AM	#4
streetdreams5520 Drives: 11 cts-v coupe Join Date: Dec 2014 Location: nj Posts: 31	thanks guys really needing some help here.he said it was BANK1=all 4 cyl but ill verify in a few put new plugs in and he swapped all 4 coil packs from passenger side to driver side and problem persisted. that is how he ruled out coils.... maybe wires? but doubt it took off bank1 valve cover pushed down on the springs no movement i watched bank1 while car was idling for few seconds everything was moving nicely. leak down test now? what else would cause this? nothing else i can check? thanks for help guys im trying to figure this out before i have to take it into a shops

02-23-2015, 08:47 AM	#6
streetdreams5520 Drives: 11 cts-v coupe Join Date: Dec 2014 Location: nj Posts: 31	btw my plugs are very normal looking i should've taken pics ....but im sure they are good my problem come on when i give the engine load(boost) etc

02-23-2015, 09:43 AM	#9
HDRDTD Drives: 2013 Triple Black ZL1 Vert M6 ECF Join Date: Mar 2011 Location: Trenton, Michigan Posts: 7,047	I know this may sound strange, but what about a blown/clogged cat on that side?

02-23-2015, 10:00 AM	#10
NicKey Drives: Nickey Super Camaro Join Date: Nov 2008 Location: Loves Park, Illinois Posts: 1,668	Check your plug wires on bank one, before you do anything else. You checked plugs and coils but not what is in between them.

02-23-2015, 10:49 AM	#11
streetdreams5520 Drives: 11 cts-v coupe Join Date: Dec 2014 Location: nj Posts: 31	The tuner hasn't been picking up the phone so I can find out if it was one particular cylinder.... but he made it seem like it was all of bank 1. How likely are all the wires bad on that side? Or how likely is that whole side of engine is bad? My mods are cat delete, Full exhaust 63 lbs injectors 15 lbs of boost (Upper and lower) I have the lingenfelter 650 kit I got it retune I made 500/510 mustang dyno

02-23-2015, 10:50 AM	#12
streetdreams5520 Drives: 11 cts-v coupe Join Date: Dec 2014 Location: nj Posts: 31	I'll check the wires but I would need to get new ones as I have efi live and supposedly it doesn't detect a miss fire like hptuners

02-23-2015, 11:16 AM	#13
Redlineviper Drives: 2013 ZL1 Join Date: Jan 2015 Location: Orlando Posts: 936	My buddy had a similar misfire and it ended up being an injector plug that did not have good contact.

02-23-2015, 11:31 AM	#14
kgendron71 REDHOT_ZL1 Drives: 2014 Red Hot ZL1 M6 Join Date: Dec 2014 Location: Gainesville, Fl. Posts: 194	Check all connections for moisture.