no compression - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

therigwelder · 08-26-2023, 05:56 PM

2011 camaro 3.6 with no compression, I initially believed it to be the timing chain however when I pulled the valve covers the chain was snug on the camshafts and turned with the crankshaft .the spark plugs had been firing perfectly, the plugs were a tan color, so i do not believe there to be any ring issues. Whatever caused the loss of compression was sudden. I dropped a borescope into the cylinders, they looked good. The reliefs cut in the pistons looked good with no visible sign of valve interference. if the valves were bent it would only affect a couple of cylinders compression not the entire engine, I think the 3.6 camaro engines have a factory forged crank and connecting rods, I should not have a problem there. I am stumped on the diagnostics to figure out what the problem is,help would be appreciated

morepowerjoe · 08-26-2023, 06:14 PM

If there was an instance where a valve got bent then they more than likely all got bent causing your no compression issue. Did you see any indents on the piston tops. Even if you didn't they would be hard to see.

hunter1660 · 08-26-2023, 06:18 PM

Relucter gear spun on crankshaft?

morepowerjoe · 08-26-2023, 06:20 PM

Since the 3.6 has vvt your cam phaser could be out of wack causing it to have interference with the pistons and the valves but I don't know how common this would be to be honest.

therigwelder · 08-26-2023, 06:44 PM

there are factory cut reliefs in the piston tops, the piston tops are not beat up nor any unusual scarring

morepowerjoe · 08-26-2023, 06:49 PM

Well the only other thing I can think of is the cam phaser is jacked up it will be out of time and have no compression.

therigwelder · 08-26-2023, 07:13 PM

https://photos.app.goo.gl/s34DgiG18Co7srxN7.i will do some research on the cam phaser.thank you

therigwelder · 08-27-2023, 08:43 AM

Should there be voltage KOEO to the VVT solenoids?

PaulsSS · 08-27-2023, 07:36 PM

1st thing is pull the valve covers and check for broken rockers-cam followers. Second carefully check the cam timing. Mu guess is the cam timing is off and it bent all the valves and may have broken the valve train.

08-26-2023, 05:56 PM	#1
therigwelder Drives: 2011 Camaro ls Join Date: Aug 2023 Location: Mississippi Posts: 24	no compression 2011 camaro 3.6 with no compression, I initially believed it to be the timing chain however when I pulled the valve covers the chain was snug on the camshafts and turned with the crankshaft .the spark plugs had been firing perfectly, the plugs were a tan color, so i do not believe there to be any ring issues. Whatever caused the loss of compression was sudden. I dropped a borescope into the cylinders, they looked good. The reliefs cut in the pistons looked good with no visible sign of valve interference. if the valves were bent it would only affect a couple of cylinders compression not the entire engine, I think the 3.6 camaro engines have a factory forged crank and connecting rods, I should not have a problem there. I am stumped on the diagnostics to figure out what the problem is,help would be appreciated __________________

08-26-2023, 06:14 PM	#2
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,128	If there was an instance where a valve got bent then they more than likely all got bent causing your no compression issue. Did you see any indents on the piston tops. Even if you didn't they would be hard to see. __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

08-26-2023, 06:18 PM	#3
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	Relucter gear spun on crankshaft? __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners

08-26-2023, 06:20 PM	#4
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,128	Since the 3.6 has vvt your cam phaser could be out of wack causing it to have interference with the pistons and the valves but I don't know how common this would be to be honest. __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

08-26-2023, 06:44 PM	#5
therigwelder Drives: 2011 Camaro ls Join Date: Aug 2023 Location: Mississippi Posts: 24	there are factory cut reliefs in the piston tops, the piston tops are not beat up nor any unusual scarring __________________

08-26-2023, 06:49 PM	#6
morepowerjoe Drives: 2012 Chevrolet Camaro l99 Join Date: Aug 2020 Location: Austin, TX Posts: 2,128	Well the only other thing I can think of is the cam phaser is jacked up it will be out of time and have no compression. __________________ DSS FX Forged Pistons, Eagle ESP L19 Forged Rods, ARP Head and Main Studs, TSP PRC 260 CNC Ported Heads milled .030, Cometic .040 Head Gaskets, GPI SS3 VVT Camshaft, GM Performance Racing Lifters, CHE Trunnions , Molly Pushrods, Melling 10355HV Oil Pump, Cold Air Inductions CAI, Fast LSXR Intake Manifold, Nick Williams 103 TB, TSP 1 7/8" Longtubes with 3" TSP Exhaust, ZL1 Fuel Pump, Mishimoto Radiator, Mishimoto Oil Cooler, Tru Cool 40k Tranny Cooler, 3600 Circle D Converter, Fluid Dynamics Balancer Build Thread https://www.camaro5.com/forums/showthread.php?t=609817

08-26-2023, 07:13 PM	#7
therigwelder Drives: 2011 Camaro ls Join Date: Aug 2023 Location: Mississippi Posts: 24	https://photos.app.goo.gl/s34DgiG18Co7srxN7.i will do some research on the cam phaser.thank you __________________

08-27-2023, 08:43 AM	#8
therigwelder Drives: 2011 Camaro ls Join Date: Aug 2023 Location: Mississippi Posts: 24	Should there be voltage KOEO to the VVT solenoids? __________________

08-27-2023, 07:36 PM	#9
PaulsSS Drives: 15SS Camaro Join Date: Dec 2020 Location: US Posts: 346	1st thing is pull the valve covers and check for broken rockers-cam followers. Second carefully check the cam timing. Mu guess is the cam timing is off and it bent all the valves and may have broken the valve train.