Engine sounds thrashy after Holley High ram and valley cover install - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

209camaross · 07-08-2020, 04:57 PM

so for the past few weeks I've been installing this holley high ram and just got the engine started the other day and it sounds weird to me, its hard to start, alot of valve train noise sounds thrasy, idle sounds off, mini backfires sounds inside the manifold when i push the throttle, im sure i lt needs a tune but my tuner says it sounds really off like pushrod lengths are off. The heads were never removed the only parts changed was the Holley high ram, valley cover with no pcv port, and valve covers. These covers are connected to a catch can so i can vent out the engine or do i need to still pull pcv from somewhere..i also extended the wires to the TB harness and Coil packs so imma have to check those again

xc_SS/RS · 07-09-2020, 01:37 PM

Check the coil pack wires. Maybe two are switched?

Also what radiator is that? Looks like the cap is off to one side

209camaross · 07-09-2020, 02:32 PM

Quote:

Originally Posted by xc_SS/RS

Check the coil pack wires. Maybe two are switched?

Also what radiator is that? Looks like the cap is off to one side

Yea this weekend imma check all the wires, this is a Afco radiator hooked up to a meziere water pump.. there's nothing wrong there

xc_SS/RS · 07-09-2020, 02:43 PM

Quote:

Originally Posted by 209camaross

Yea this weekend imma check all the wires, this is a Afco radiator hooked up to a meziere water pump.. there's nothing wrong there

Nah I didn’t think anything was wrong but I have been looking for a radiator with the cap/fill neck that’s off to the side so there’s nothing in the way of a OTR intake

joshnmn · 07-10-2020, 07:08 AM

I hope you figure it out... it’s lookin nice!

WHAMMO · 07-14-2020, 11:38 PM

I had a loose spark plug and the car was hard to start.. engine is clean!!
How is the car with the Holley? I am looking into a lsxhr Fast intake, maybe...

eLeSthree · 07-15-2020, 06:22 AM

I just installed the Holley low pro, and there was alot more valve train noise. It was really noisy.

Is that a stock TB? You'll definitely need a tune for a TB and intake swap. If its a 102mm you'll need to change the ETC scalar to 7380. It probably needs more Start up airflow and changes to the Base Running Airflow. If you havent updated the tune, I would start there.

One thing I noticed with the holley intake, you have to be very careful installing the injectors. The intake ports where the injectors sit are slightly tighter and shorter than the stock ones. You cant push in a circular motion or you'll scrape the injector nozzle inside the intake. I tore an oring trying to get one in, but I had spares. Just had to lube them well, and push straight in, but takes 10 times more force than a stock intake. Not sure if the Hi-Ram is the same, but if so, make sure you didnt tear an oring.

Bo White · 07-15-2020, 01:23 PM

Aluminum manifolds will change the sound compared to plastic and tunnel ram style manifolds will change the sound compared to runner inlets facing down.

1LEPanda · 02-21-2021, 04:28 PM

What did y’all done for the evap line that goes to the manifold???

1JEWLDSSRS · 02-21-2021, 06:02 PM

When we did the LOD install on mine we deleted the evap system for a nice clean look.

Bo White · 02-21-2021, 11:40 PM

https://www.ictbillet.com/purge-sole...rger-hose.html

07-08-2020, 04:57 PM	#1
209camaross Drives: 2012 camaro ss ashen gray Join Date: May 2012 Location: modesto ca Posts: 278	Engine sounds thrashy after Holley High ram and valley cover install so for the past few weeks I've been installing this holley high ram and just got the engine started the other day and it sounds weird to me, its hard to start, alot of valve train noise sounds thrasy, idle sounds off, mini backfires sounds inside the manifold when i push the throttle, im sure i lt needs a tune but my tuner says it sounds really off like pushrod lengths are off. The heads were never removed the only parts changed was the Holley high ram, valley cover with no pcv port, and valve covers. These covers are connected to a catch can so i can vent out the engine or do i need to still pull pcv from somewhere..i also extended the wires to the TB harness and Coil packs so imma have to check those again __________________ Last edited by 209camaross; 02-20-2023 at 11:17 AM.

07-09-2020, 01:37 PM	#2
xc_SS/RS Drives: 2010 Camaro SS/RS Join Date: Mar 2014 Location: somewhere in MD Posts: 4,883	Check the coil pack wires. Maybe two are switched? Also what radiator is that? Looks like the cap is off to one side __________________ 2010 2SS/RS Z/28 intake, NW, FAST 102, speed engineering LT's, some exhaust, ATI -10% pulley, GM flex fuel injectors, DSX flex fuel sensor, MGW shifter, HP Tuners, some suspension work, stickers and a little weight loss. 12.63 @113.53

07-14-2020, 11:38 PM	#6
WHAMMO Drives: 13' 1LE Join Date: Apr 2012 Location: Canada Posts: 2,646	I had a loose spark plug and the car was hard to start.. engine is clean!! How is the car with the Holley? I am looking into a lsxhr Fast intake, maybe... __________________ 13' 1LE Old setup: TSP 231-236/Tick 660/.105 PR, UDP, SW LT 2'' & HFC, stock NPP & H pipe, VR-DRX CAI, air scoop, Goertz1 manifold, 102mm BBK, 26" Toyo DRs, Forgestars R17x10 & F18x8, rear seat delete, remote Pat G tune Autocal, 7400 limiter, Spec Mini Twin. 91oct. 11.90@122.3, 0-60ft 2.0 / 11.99@123.6, 0-60ft 2.1 DA+819 ...519RWHP SAE Solid roller SBE LS3, FED, LLSR, 91oct, 605rwhp N/A. Tuned by Pat G. Build by me.

07-15-2020, 06:22 AM	#7
eLeSthree Drives: 2011 Camaro SS 6sp Join Date: Nov 2016 Location: Drivers Seat Posts: 1,905	I just installed the Holley low pro, and there was alot more valve train noise. It was really noisy. Is that a stock TB? You'll definitely need a tune for a TB and intake swap. If its a 102mm you'll need to change the ETC scalar to 7380. It probably needs more Start up airflow and changes to the Base Running Airflow. If you havent updated the tune, I would start there. One thing I noticed with the holley intake, you have to be very careful installing the injectors. The intake ports where the injectors sit are slightly tighter and shorter than the stock ones. You cant push in a circular motion or you'll scrape the injector nozzle inside the intake. I tore an oring trying to get one in, but I had spares. Just had to lube them well, and push straight in, but takes 10 times more force than a stock intake. Not sure if the Hi-Ram is the same, but if so, make sure you didnt tear an oring. __________________ 2011 Camaro SS---SOLD TMS Dart 427 FED M311s, ESS Tuning G4 Blower, DSX Triple FP Assembly, DSX FF, FIC1300, Mcleod RXT 1200HD, Edlebrock Pro Flo XT 1158whp 1017wtq. 2010 CTS-V A6 - "Stock" SOLD 630whp 658wtq 2024 F-150 RCSB 5.0 4x4 waiting for tunes...

02-21-2021, 06:02 PM	#10
1JEWLDSSRS Drives: 2011 SS-RS Join Date: May 2011 Location: FLORIDA Posts: 11,754	When we did the LOD install on mine we deleted the evap system for a nice clean look. __________________ TSP STAGE 3 CAM,231/246 @112 LSA 614/641 LIFT, CIRCLE D 5C-4200-4500 CONVERTER,LOD INTAKE.CORSA EXHAUST. DSS 1 PC DS. PEGASUS SOLID CRADLE MOUNTS. 486RWHP/475RWTQ.LOTS MORE.

07-10-2020, 07:08 AM	#5
joshnmn 2&THEHIT Drives: 5th Gen Camaro; 5th Gen Ram 3500 Join Date: Mar 2018 Location: Garner, NC Posts: 1,032 View My Garage	I hope you figure it out... it’s lookin nice!

07-15-2020, 01:23 PM	#8
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,041	Aluminum manifolds will change the sound compared to plastic and tunnel ram style manifolds will change the sound compared to runner inlets facing down.

02-21-2021, 04:28 PM	#9
1LEPanda Drives: 2014 1LE Join Date: Nov 2018 Location: Tx Posts: 2	What did y’all done for the evap line that goes to the manifold???

02-21-2021, 11:40 PM	#11
Bo White Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012 Location: Vance Alabama Posts: 8,041	https://www.ictbillet.com/purge-sole...rger-hose.html __________________ Retired wanna be cylinder head porter 2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X