Problem after vvt cam install - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

hammdo · 05-08-2019, 07:35 PM

Recheck all your grounds — especially the ones from the passenger head to the body and the grounds on the passenger head by the exhaust...

-Don

InFiD3ViL · 05-08-2019, 09:22 PM

Quote:

Originally Posted by hammdo

Recheck all your grounds — especially the ones from the passenger head to the body and the grounds on the passenger head by the exhaust...

-Don

Listen to this man ^^^

HooliganZ · 05-09-2019, 04:01 PM

Checked wiring, connections and grounds at least half a dozen times now. Installed a new battery and car still won't start. Cranking is erratic and not on a cadence like I'm used to hearing. We're going to take the timing cover off Saturday and make sure something didn't happen with the timing chain and make sure we're still dot to dot at tdc. Beyond that, I don't know what else to check. Log shows commanded afr while cranking is 3.5 and injector pulse width around 25. Not sure what could be causing that.

hammdo · 05-09-2019, 05:37 PM

Did you pull the heads? If so, there are grounds on the back of the heads. You'll want to be sure of those...

-Don

hunter1660 · 05-09-2019, 06:14 PM

Did you check the shrader valve on fuel line for pressure?

HooliganZ · 05-09-2019, 08:34 PM

Quote:

Originally Posted by hammdo

Did you pull the heads? If so, there are grounds on the back of the heads. You'll want to be sure of those...

-Don

Yes, heads were pulled to install new lifters. Those grounds have been checked as well.

HooliganZ · 05-09-2019, 08:35 PM

Quote:

Originally Posted by hunter1660

Did you check the shrader valve on fuel line for pressure?

Yes, shows between 50-60 psi

InFiD3ViL · 05-09-2019, 11:04 PM

Quote:

Originally Posted by HooliganZ

Log shows commanded afr while cranking is 3.5 and injector pulse width around 25. Not sure what could be causing that.

Well obviously that's not in the tune, so all I can think of is sensor failure or open circuit on a sensor?

May have to pull out a multi-meter and test every relevant sensor.

HooliganZ · 05-10-2019, 08:56 AM

Quote:

Originally Posted by InFiD3ViL

Well obviously that's not in the tune, so all I can think of is sensor failure or open circuit on a sensor?

May have to pull out a multi-meter and test every relevant sensor.

Is there a write-up somewhere on how to do that?

HooliganZ · 05-11-2019, 11:36 PM

Turns out it's hurt alot worse than I thought. Did a compression test and 5 cylinders had 0 compression. 2 had 180 and 1 had 150. Gotta pull the heads again and replace the bent valves. While I'm at it, I'm just going to delete vvt and go with an LS-3 cam. In the log we took while driving, there was a downshift from 6-4 under light acceleration accompanied by a commanded timing advance of 33 degrees. Best we can tell is the timing advanced too far which resulted in pistons contacting valves. Don't know why that would have happened because we installed the phaser limiter and followed the directions to the letter. I don't want this to happen again, so I'm just going to delete vvt and be done with it.

John_C · 05-12-2019, 01:12 AM

Did you put in the new cam phaser tables in the tune for that cam?

HooliganZ · 05-12-2019, 10:52 AM

Quote:

Originally Posted by John_C

Did you put in the new cam phaser tables in the tune for that cam?

Ryan at GPI sent me the tune, so I'm sure he did. It's their cam.

InFiD3ViL · 05-12-2019, 01:04 PM

Damn, this sucks. I would really have Ryan take another look at that tune. Mistakes can be made.

HooliganZ · 05-12-2019, 11:15 PM

Found the problem. When I installed the phaser sprocket on the cam, I didn't get it fully seated on the cam dowel. There is a deep groove all around the back of the phaser from where the dowel dug into it. Also ground the dowel about half way off. All 8 intake valves are bent. Expensive mistake for sure. Since I would need a new cam and phaser anyway, I'm just going to do the vvt delete and go with a TSP 225/236 LS3 cam.

05-08-2019, 07:35 PM	#15
hammdo 'It's an experiment' Drives: [COTW 2/09/15] '11 GPI LSA SC Z/LE Join Date: May 2014 Location: Dallas TX Posts: 8,694 View My Garage	Recheck all your grounds — especially the ones from the passenger head to the body and the grounds on the passenger head by the exhaust... -Don __________________ 747 RWHP 794 RWTQ "Horsepower sells cars, torque wins races." - Enzo Ferrari See My Build: http://www.camaro5.com/forums/showthread.php?t=385577

05-09-2019, 04:01 PM	#17
HooliganZ Drives: 2011 2SS/RS A6 Join Date: Jan 2008 Location: Texas Posts: 153 View My Garage	Checked wiring, connections and grounds at least half a dozen times now. Installed a new battery and car still won't start. Cranking is erratic and not on a cadence like I'm used to hearing. We're going to take the timing cover off Saturday and make sure something didn't happen with the timing chain and make sure we're still dot to dot at tdc. Beyond that, I don't know what else to check. Log shows commanded afr while cranking is 3.5 and injector pulse width around 25. Not sure what could be causing that. __________________

05-09-2019, 05:37 PM	#18
hammdo 'It's an experiment' Drives: [COTW 2/09/15] '11 GPI LSA SC Z/LE Join Date: May 2014 Location: Dallas TX Posts: 8,694 View My Garage	Did you pull the heads? If so, there are grounds on the back of the heads. You'll want to be sure of those... -Don __________________ 747 RWHP 794 RWTQ "Horsepower sells cars, torque wins races." - Enzo Ferrari See My Build: http://www.camaro5.com/forums/showthread.php?t=385577

05-09-2019, 06:14 PM	#19
hunter1660 Drives: 2011ss/rs camaro Join Date: Sep 2011 Location: florida Posts: 1,261	Did you check the shrader valve on fuel line for pressure? __________________ . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners

05-11-2019, 11:36 PM	#24
HooliganZ Drives: 2011 2SS/RS A6 Join Date: Jan 2008 Location: Texas Posts: 153 View My Garage	Turns out it's hurt alot worse than I thought. Did a compression test and 5 cylinders had 0 compression. 2 had 180 and 1 had 150. Gotta pull the heads again and replace the bent valves. While I'm at it, I'm just going to delete vvt and go with an LS-3 cam. In the log we took while driving, there was a downshift from 6-4 under light acceleration accompanied by a commanded timing advance of 33 degrees. Best we can tell is the timing advanced too far which resulted in pistons contacting valves. Don't know why that would have happened because we installed the phaser limiter and followed the directions to the letter. I don't want this to happen again, so I'm just going to delete vvt and be done with it. __________________

05-12-2019, 01:12 AM	#25
John_C LSx FTW!!! Drives: 2010 Camaro 2SS RS Join Date: Jan 2017 Location: TN Posts: 767	Did you put in the new cam phaser tables in the tune for that cam? __________________ 2010 2SS RS A6 781rwhp on E85 Stage 2 ProCharger D1X Circle D 3400 Triple Disc Kooks Jet Hot Headers Kooks Full 3in exhaust Trick Flow GenX 255's Polished PAC .660's & Ti-retainers TSP VVT 3.2 cam kit w/DoD Delete Smith Bro's Trunnion kit AEM X-Series OBDII Widebands FIC ID1300x Injectors GM ZL1 High Output Fuel Pump DSX Tuning Flex Sensor DSX Auxiliary Fuel System Tim King Stage 4 Max Effort CTSV 6L90 DSS 1 piece aluminum driveshaft JRE 6L80E / 6L90E Dipstick NGK Iridium IX spark plugs #7 heat range Mighty Mouse Camaro 5 Wild w/-12an and Billet Black HP Tuners VCM Suite

05-12-2019, 01:04 PM	#27
InFiD3ViL Drives: 2010 CGM 2SS/RS LS3 Swapped A6 Join Date: Sep 2016 Location: Spring Hill, FL Posts: 4,575	Damn, this sucks. I would really have Ryan take another look at that tune. Mistakes can be made. __________________ 2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4, 7º overlap) on CamMotion 8620 core, BTR Platinum .660" Dual Spring kit w/titanium retainers, CHE bronze trunnion upgrade, stock heads milled @ .015, Melling HV 10296 oil pump, TSP 1-7/8" long tube headers (W/Catless Off-road Pipes), Corsa Xtreme 3" Catback, GPI Ported/Rod Mod Intake, Stage 2 Ported Throttle Body, Vararam OTR CAI, Mike Norris Gen 2 catch can + GM 1LE clean side separator, 160º thermostat - Megan Racing adjustable coilovers (lowered 1.75"), MRR M017 10/11" wheels-Tuned by Ryan @ GPI

05-12-2019, 11:15 PM	#28
HooliganZ Drives: 2011 2SS/RS A6 Join Date: Jan 2008 Location: Texas Posts: 153 View My Garage	Found the problem. When I installed the phaser sprocket on the cam, I didn't get it fully seated on the cam dowel. There is a deep groove all around the back of the phaser from where the dowel dug into it. Also ground the dowel about half way off. All 8 intake valves are bent. Expensive mistake for sure. Since I would need a new cam and phaser anyway, I'm just going to do the vvt delete and go with a TSP 225/236 LS3 cam. __________________