10-31-2023, 10:00 AM | #1 |
Drives: 2018 Camaro SS 1LE Join Date: Oct 2023
Location: Wilmington NC
Posts: 10
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Car running super rough! Help!
I have a 2018 Camaro SS 1LE m6 and I just did a head gasket replacement and got both of the heads machined. I also got all new spark plugs and wires, and all new injectors. As I did that I also installed speed engineering long tubes and x pipe. And now the problem is that the car is shaking super violently and feels like it’s about to stall off it’s throwing over 13 codes and I don’t know what to do. Should I unplug the rear o2 sensors? Or plug them in and just tie them up.
Thanks! |
10-31-2023, 03:26 PM | #2 |
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First check for a vacuum leak and for any loose wires/connectors. Second take the car to a tuner. The changes you’ve made will require a tune to get everything right. Did you have the heads milled? If so you have increased the engine compression unless you used a thicker head gasket - another reason to get it tuned.
Also if you milled the heads and used a factory head gasket you may need to check the piston to valve clearance. I don’t know how tight the PTV clearance is on a stock setup. Hopefully some of the more knowledgeable folks will chime in. Good luck and keep us posted.
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2016 Camaro 1SS Hyper Blue 6MT NPP
2010 Camaro 2SS Cam/Headers/CAI/3.91 gears 476 rwhp/440 rwtq (sold) |
10-31-2023, 03:51 PM | #3 | |
Drives: Chevy Camaro Join Date: Sep 2022
Location: IN
Posts: 193
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Quote:
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'20 Camaro LT1
Twin 67/62 turbo 401(L8t) Texas speed forged piston & rod, BTR stg1 turbo cam, holley ultra lo, port injection, circle d 3600 stall, hoosier bias ply quick time pro's on racestar recluse wheels 1.45 4.01 6.07@120.74 9.28@153.43 '94 Camaro Z28 6mt cc306 cam, 4:10's, longtubes with x pipe, getting an engine rebuild |
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10-31-2023, 04:38 PM | #4 | |
Drives: 2018 Camaro SS 1LE Join Date: Oct 2023
Location: Wilmington NC
Posts: 10
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10-31-2023, 04:41 PM | #5 |
Drives: 2018 Camaro SS 1LE Join Date: Oct 2023
Location: Wilmington NC
Posts: 10
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11-01-2023, 06:55 AM | #6 |
Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016
Location: Ocean City, NJ
Posts: 3,182
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11-01-2023, 07:04 AM | #7 |
Drives: 2018 Camaro SS 1LE Join Date: Oct 2023
Location: Wilmington NC
Posts: 10
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11-01-2023, 09:36 AM | #8 |
Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016
Location: Ocean City, NJ
Posts: 3,182
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The first four codes are O2 sensor codes, and it sounds like the car is running rich, based on high O2 sensor voltage.
P0300 is random misfire, which means the ECU can't even localize the problem. The last four are coil codes. I think the random misfire and coil codes are related. My guesses: The rich condition may be due to new injectors, which I assume are larger. This may be corrected with a tune, or you could try reinstalling the old injectors to see what clears. The random misfire and coil codes may be related to new spark plug wires and their internal resistance (or lack of resistance). Short of going to a tuner, I would try reverting to old injectors and plug wires. See what clears up. Also, be careful of running super-rich. You don't want to gas wash the oil off your cylinder walls. |
11-11-2023, 04:23 PM | #9 |
376 cubic inches of fun
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Oh oh. Are all the wires plugged into the right plugs?
I know how to sort this out for cars from the stone age (rotor in mechanical distributor), but what to do now? |
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long tube, rough idle |
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