10-29-2019, 01:44 PM | #1 |
Drives: 2016 Camaro SS Join Date: Oct 2019
Location: Ca
Posts: 7
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Misfire at 3k rpm, Help!
So, new to the forum, nice to meet everyone!
I have a 2016 Camaro SS with 57k on the clock; It has a misfire on cylinders 5&8 between 3-4k Rpm. So far I have replaced all fuel injectors, the fuel pumps and the ignition system(plugs, wires, and coils) this has been an issue since i bought the car a year ago and I’ve taken it to two chevy dealers and they can’t seem to figure out whats wrong. Recently I reset the torque on all the rocker arms just incase something was too tight and to make sure i didn't have a weak or collapsed lifter... Any Ideas? Thanks in advance! P.s. the car is stock aside from long tubes, and a tune. |
10-29-2019, 01:51 PM | #2 |
Drives: Chevy Camaro Join Date: Jul 2019
Location: Dallas
Posts: 420
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I would suspect the tune if you have changed all that, does it bring on the CEL?
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10-29-2019, 02:50 PM | #3 |
Drives: 2016 Nightfall Metallic Grey 2ss Join Date: Oct 2017
Location: New Orleans, LA
Posts: 121
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Check for a broken valvespring or carbon collected on either of the intake and exhaust valves preventing the valve from seating and sealing.
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10-29-2019, 03:01 PM | #4 |
Drives: 2016 Camaro SS Join Date: Oct 2019
Location: Ca
Posts: 7
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@SSMoFo- this has been an ongoing issue since the car was bone stock; CEL flashes but doesn’t stay on.
@Wilka_SS- None of my valve springs appear to be cracked or broken... I’ll have to check throughly for carbon buildup on valves. |
10-30-2019, 09:28 AM | #5 |
Drives: 2017 Camaro SS 2ss Nightfall Gray Join Date: Aug 2018
Location: New york
Posts: 149
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I am no expert , but maybe its something electrical . Maybe the wiring to the coils or something. Especially since its always done it and looking at what you replaced already, I cant think of anything else it could be.
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10-31-2019, 07:05 AM | #6 |
Drives: 2016 Camaro 2SS M6 Join Date: Mar 2019
Location: Raleigh
Posts: 56
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it should still be under powertrain warranty, tell the dealer to fix it
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10-31-2019, 07:49 PM | #7 |
Drives: 2016 Camaro SS Join Date: Oct 2019
Location: Ca
Posts: 7
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Everything looks fine visually... I’ll put a multi meter on the harness this weekend just in case...
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10-31-2019, 07:52 PM | #8 | |
Drives: 2016 Camaro SS Join Date: Oct 2019
Location: Ca
Posts: 7
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Quote:
However, I have a 3rd party extended warranty that covers what chevy would in their powertrain warranty(all internally lubricated parts, not including injectors). |
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10-31-2019, 08:45 PM | #9 | |
Thank you Al Oppenheiser!
Drives: Red Hot A10 ZL1 Convertible Join Date: Jun 2017
Location: Sarasota, FL
Posts: 5,018
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Quote:
Edit: nevermind, I see you have a tune. |
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11-01-2019, 05:25 PM | #10 | |
Drives: 2016 Camaro SS Join Date: Oct 2019
Location: Ca
Posts: 7
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Quote:
Edit: Checked my e-mail again; the notice was to let me know my warranty was expiring soon |
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11-02-2019, 08:47 PM | #11 |
Drives: 2016 Camaro SS Join Date: Oct 2019
Location: Ca
Posts: 7
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Update: As of right now there is no more misfire, we’ll see what happens when I take her back to the dyno...
Things I did: checked all wiring from the ECM to each coil(no issues found), checked all ECM fuses and relays(no issues found), Replaced all pushrods and re-gapped spark plugs from .040 to .035. Thanks for the input guys! |
02-06-2020, 09:59 PM | #12 |
Drives: 2016 Camaro SS Join Date: Oct 2019
Location: Ca
Posts: 7
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Update: Maybe I can save someone a headache later down the line
So, the misfire came back a few weeks after the aforementioned parts were replaced So, I took my time and diagnosed a little better.... Misfire only happened at 3k or higher steady state throttle. I already ruled out the ignition system, fuel system, and the possibility of damaged lifters push rods and valves. So... I ended up marking my valve springs with a paint marker and gave her a good rev to 4k and lo and behold.... My valves were floating (photos attached) Hope no one else runs into this issue, but on the bright side the LT1 is a non interference engine in stock trim Good Luck out there and remember to be thorough when troubleshooting. |
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engine, misfire |
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