1/2 to WOT Problems (medium and high load) - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Skyler1955 · 07-31-2021, 05:36 PM

Hi everyone I have a 2011 Camaro SS2, when I first start the car and drive no problems at any load or RPM. when the car warms up and I give it more than 1/2 throttle it frequently bogs/misfires like it cutting fuel and when you let off the throttle it will backfire sometimes. it just randomly starting doing this. there are no codes. I need some help and opinions.

More about the car
- LS3
- BTR Stage 4 cam Spec. 233/250 .618"/.596" 113+5
- Cold Air intake
- Long tube headers with high flow cats
- Straight pipe
- M6, final drive 4.10
- Tuned by PCM of NC
- tuned on air density (NOT MAF)

Things I checked & replace
- Checked spark plugs, all were good but cylinder number 2 looked like it had a leaky fuel injected.
- Replace fuel injector for cylinder #2 did not fix problem
- Replace spark plug wire did not fix problem

HP tune and log files
- File: https://drive.google.com/file/d/1rIp...ew?usp=sharing
- Log: https://drive.google.com/file/d/1nS_...ew?usp=sharing
(LOG of times when events were happening)
- 5:36 bog/maybe misfire
- 5:47-5:50 bog/maybe misfire
- 5:54 bog maybe misfire
- 5:56 closed loop commanded off
- 6:03 closed loop commanded on
- 6:06 closed loop commanded off
- 6:09 bog/maybe misfire

I NEED SOME HELP AND ADVICE!

Mouse330 · 07-31-2021, 11:49 PM

Remove the MAF and visually look at the hot wires to see if there’s anything on them. Spray them with brake cleaner or air intake cleaner, blow them off or let dry. Reinstall and test drive

Skyler1955 · 08-01-2021, 12:14 PM

I have check the MAF sensor look good and clean. had a replacement one went ahead and changed it still no difference

Car Nation Videos · 08-01-2021, 08:18 PM

MAF, Coil Packs, Spark Plugs.

Easy Fix

mrWizard · 08-07-2021, 04:13 PM

Did you every get anywhere with this?

I'm having misfires in cylinder 1 under WOT, no codes. Swapped plugs, wires, and coils and still happening. Haven't checked harnesses or injectors yet. I also checked loose hoses and cleaned the MAF and it's connector.

mrWizard · 08-23-2021, 08:50 AM

Spark plugs and wires.

Most likely was my wires. I skimped on replacing them a while back. After replacing them and plugs, everything is normal.

wasthatacop? · 08-24-2021, 11:38 PM

Did you fix it?

Skyler1955 · 09-29-2021, 10:14 PM

Hi sorry for the delay but I did fix it, coil number 4 started to have a weak spark when it got hot and under load. Changed it and the problem went away thanks for the help

07-31-2021, 05:36 PM	#1
Skyler1955 Drives: 2011 Camaro 2ss /1956 chevy Bel Air Join Date: May 2018 Location: Milton GA Posts: 7	1/2 to WOT Problems (medium and high load) Hi everyone I have a 2011 Camaro SS2, when I first start the car and drive no problems at any load or RPM. when the car warms up and I give it more than 1/2 throttle it frequently bogs/misfires like it cutting fuel and when you let off the throttle it will backfire sometimes. it just randomly starting doing this. there are no codes. I need some help and opinions. More about the car - LS3 - BTR Stage 4 cam Spec. 233/250 .618"/.596" 113+5 - Cold Air intake - Long tube headers with high flow cats - Straight pipe - M6, final drive 4.10 - Tuned by PCM of NC - tuned on air density (NOT MAF) Things I checked & replace - Checked spark plugs, all were good but cylinder number 2 looked like it had a leaky fuel injected. - Replace fuel injector for cylinder #2 did not fix problem - Replace spark plug wire did not fix problem HP tune and log files - File: https://drive.google.com/file/d/1rIp...ew?usp=sharing - Log: https://drive.google.com/file/d/1nS_...ew?usp=sharing (LOG of times when events were happening) - 5:36 bog/maybe misfire - 5:47-5:50 bog/maybe misfire - 5:54 bog maybe misfire - 5:56 closed loop commanded off - 6:03 closed loop commanded on - 6:06 closed loop commanded off - 6:09 bog/maybe misfire I NEED SOME HELP AND ADVICE!

08-24-2021, 11:38 PM	#7
wasthatacop? Drives: 2010 2SS Join Date: Apr 2017 Location: Los Angeles Posts: 360 View My Garage	Did you fix it? __________________ 2010 2SS living in Los Angeles replaced engine @ 93,000 miles w/ crate engine, camshaft by Comp Cams installed by me, replaced valve train parts, 1.4" BMR lowering springs ZL1 factory rims misc: drilled and slotted rotors, fresh air brake cooling system, new speakers, installed reverse camera, muffler delete

07-31-2021, 11:49 PM	#2
Mouse330 Drives: 2011 2SS, 2006 GMC Sierra Join Date: Jul 2019 Location: MA Posts: 266	Remove the MAF and visually look at the hot wires to see if there’s anything on them. Spray them with brake cleaner or air intake cleaner, blow them off or let dry. Reinstall and test drive

08-01-2021, 12:14 PM	#3
Skyler1955 Drives: 2011 Camaro 2ss /1956 chevy Bel Air Join Date: May 2018 Location: Milton GA Posts: 7	I have check the MAF sensor look good and clean. had a replacement one went ahead and changed it still no difference

08-01-2021, 08:18 PM	#4
Car Nation Videos YouTube-Car Nation Videos Drives: 2010 Chevrolet Camaro Join Date: Nov 2019 Location: Florida Posts: 246	MAF, Coil Packs, Spark Plugs. Easy Fix

08-07-2021, 04:13 PM	#5
mrWizard Drives: 2010 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: New Jersey Posts: 75	Did you every get anywhere with this? I'm having misfires in cylinder 1 under WOT, no codes. Swapped plugs, wires, and coils and still happening. Haven't checked harnesses or injectors yet. I also checked loose hoses and cleaned the MAF and it's connector.

08-23-2021, 08:50 AM	#6
mrWizard Drives: 2010 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: New Jersey Posts: 75	Spark plugs and wires. Most likely was my wires. I skimped on replacing them a while back. After replacing them and plugs, everything is normal.

09-29-2021, 10:14 PM	#8
Skyler1955 Drives: 2011 Camaro 2ss /1956 chevy Bel Air Join Date: May 2018 Location: Milton GA Posts: 7	Hi sorry for the delay but I did fix it, coil number 4 started to have a weak spark when it got hot and under load. Changed it and the problem went away thanks for the help