Misfire Cylinder 1 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Eazy.SS · 08-21-2019, 03:33 PM

I have a 2015 Camaro SS with a tsp stage 3 cam and 3400 stall. About a month ago I was on vacation and service stabilitrak came up. I scanned the codes and showed misfire in cylinder 1. I changed the spark plugs, wires, coil pack to that cylinder, and moved injector around. It still had the problem in the same cylinder. I ended up taking it to a dealer and they diagnosed it as a faulty computer. But since the car was tuned they couldn’t do anything else. So I took it to my tuners shop and he installed the ecm and new tune. Still had the same problem. Since then I’ve checked valve springs, rockers, and pushrods. Still the same problem. Can anyone help? I’m ready to have my car back and running so I can put this NX Kit in

zlathim · 08-21-2019, 04:13 PM

Have you checked compression to see if that hole is producing less compression than the rest? It sounds like you have electrical and fuel eliminated.

Eazy.SS · 08-21-2019, 04:40 PM

Quote:

Originally Posted by zlathim

Have you checked compression to see if that hole is producing less compression than the rest? It sounds like you have electrical and fuel eliminated.

The dealer said that the compression was fine when I picked it up. But they also diagnosed bad ecm and that wasn’t the problem.

G8One2 · 08-21-2019, 04:49 PM

Dealerships are a joke anymore these days. Incompetence is plentiful at every dealer I have any experience with.

Eazy.SS · 08-22-2019, 05:55 PM

Checked compression. Looked fair. Still needing any help I can get. I’m out of ideas.

G8One2 · 08-22-2019, 06:42 PM

What did you get for compression? Your first compression pulse should always jump past 90psi. This indicates good valve to seat seal.

Eazy.SS · 08-23-2019, 02:02 PM

Quote:

Originally Posted by G8One2

What did you get for compression? Your first compression pulse should always jump past 90psi. This indicates good valve to seat seal.

For Cylinder 1 compression was 165psi

G8One2 · 08-23-2019, 03:18 PM

And what did the other cylinders read? No cylinder should be less than 15% of another. You "should" check all 8 cylinders. Might be better to take it to a competent mechanic for accurate diagnosis. Just checking 1 cylinder and saying it looked fair doesn't mean anything. No pun intended.

Eazy.SS · 08-23-2019, 04:24 PM

Quote:

Originally Posted by G8One2

And what did the other cylinders read? No cylinder should be less than 15% of another. You "should" check all 8 cylinders. Might be better to take it to a competent mechanic for accurate diagnosis. Just checking 1 cylinder and saying it looked fair doesn't mean anything. No pun intended.

I checked all 8. Lowest was cylinder 2 at 150 and highest was cylinder 3 at 180 the rest ranged in between there. I can’t remember them off the top of my head since I’m at work I can’t read the paper and give each.

Elite Engineering · 08-27-2019, 10:29 AM

One of the most common causes is a pinched or broken ringland. Usually it will be #7 as it runs slightly hotter than the rest, but engine will run fine except the misfire code, and will pass a compression test. BUT, only a leak down test will show this, and dealers do not perform them. Try a leak down test and let us know.

Good Luck!!

Eazy.SS · 09-16-2019, 12:12 PM

Quote:

Originally Posted by Elite Engineering

One of the most common causes is a pinched or broken ringland. Usually it will be #7 as it runs slightly hotter than the rest, but engine will run fine except the misfire code, and will pass a compression test. BUT, only a leak down test will show this, and dealers do not perform them. Try a leak down test and let us know.

Good Luck!!

Took it to the shop that done the cam swap and let them have the go at it. He started out checking the basics again. Still nothing found. He came to think that the injector was grounding itself out and spraying double the amount of fuel into the cylinder therefore causing the carbon buildup. Nope that was not it either. Performed a leakdown test next. Shows a 15% loss on the test. He says this is perfectly fine and wouldnt be any sign of a problem to cause a misfire. What do you guys think? He says he is out of ideas now so about to pay to get a broken car back again.

canadian ss · 09-19-2019, 02:24 PM

Sometimes the connectors to the coils or injectors could be bent or the pin drag loose not making a good connection when you plug them back in.

Look at the connectors and see if they move in and out easily. They should not. Sometimes guys pull on these connector wires to help unplug a connector.

Eazy.SS · 09-19-2019, 03:49 PM

Quote:

Originally Posted by canadian ss

Sometimes the connectors to the coils or injectors could be bent or the pin drag loose not making a good connection when you plug them back in.

Look at the connectors and see if they move in and out easily. They should not. Sometimes guys pull on these connector wires to help unplug a connector.

Just replaced the coils and plug wires. He says everything is good with injectors and plugs in that area. He also retired all injectors back to ecm

Rock-It Man · 09-19-2019, 05:58 PM

You should be checking the injector wire harness for damage.

08-21-2019, 03:33 PM	#1
Eazy.SS Drives: 2015 Camaro SS Join Date: Aug 2019 Location: Waynesboro, Ms Posts: 8	Misfire Cylinder 1 I have a 2015 Camaro SS with a tsp stage 3 cam and 3400 stall. About a month ago I was on vacation and service stabilitrak came up. I scanned the codes and showed misfire in cylinder 1. I changed the spark plugs, wires, coil pack to that cylinder, and moved injector around. It still had the problem in the same cylinder. I ended up taking it to a dealer and they diagnosed it as a faulty computer. But since the car was tuned they couldn’t do anything else. So I took it to my tuners shop and he installed the ecm and new tune. Still had the same problem. Since then I’ve checked valve springs, rockers, and pushrods. Still the same problem. Can anyone help? I’m ready to have my car back and running so I can put this NX Kit in

08-21-2019, 04:13 PM	#2
zlathim Drives: 2010 Camaro 2SS/RS M6 Join Date: May 2009 Location: Idaho Posts: 726	Have you checked compression to see if that hole is producing less compression than the rest? It sounds like you have electrical and fuel eliminated. __________________ GPI SS2; EE E2 catch can; SP 1 7/8" LT Headers w/ hfc; FM AT 3" cat-back; CAI Cold Air Intake; AEM Wideband Tuned by GPI McCleod RXT; MGW flat stick; Ram Clutch slave cylinder & hydraulic adjuster BMR cradle & diff bushings, trailing arms, toe rods & upper control arm bushings Hotchkis sub-frame brace Stop Tech Z-23 brakes 4.10 gears, Eaton Truetrac, LPW diff cover Best 1/4 mile 12.073 @ 115.68 mph 3,300 ft DA

08-21-2019, 04:49 PM	#4
G8One2 Drives: 2014 Camaro 2SS Join Date: Feb 2015 Location: Metro Detroit Posts: 492	Dealerships are a joke anymore these days. Incompetence is plentiful at every dealer I have any experience with.

08-22-2019, 05:55 PM	#5
Eazy.SS Drives: 2015 Camaro SS Join Date: Aug 2019 Location: Waynesboro, Ms Posts: 8	Checked compression. Looked fair. Still needing any help I can get. I’m out of ideas.

08-22-2019, 06:42 PM	#6
G8One2 Drives: 2014 Camaro 2SS Join Date: Feb 2015 Location: Metro Detroit Posts: 492	What did you get for compression? Your first compression pulse should always jump past 90psi. This indicates good valve to seat seal.

08-23-2019, 03:18 PM	#8
G8One2 Drives: 2014 Camaro 2SS Join Date: Feb 2015 Location: Metro Detroit Posts: 492	And what did the other cylinders read? No cylinder should be less than 15% of another. You "should" check all 8 cylinders. Might be better to take it to a competent mechanic for accurate diagnosis. Just checking 1 cylinder and saying it looked fair doesn't mean anything. No pun intended.

08-27-2019, 10:29 AM	#10
Elite Engineering Drives: 2010 Camaro Join Date: Nov 2009 Location: Denver Posts: 1,382	One of the most common causes is a pinched or broken ringland. Usually it will be #7 as it runs slightly hotter than the rest, but engine will run fine except the misfire code, and will pass a compression test. BUT, only a leak down test will show this, and dealers do not perform them. Try a leak down test and let us know. Good Luck!!

09-19-2019, 02:24 PM	#12
canadian ss Psycho on day pass Drives: 2010 yellow 1ss m6 -GM tech Join Date: Apr 2009 Location: grimsby, ont. Posts: 487 View My Garage	Sometimes the connectors to the coils or injectors could be bent or the pin drag loose not making a good connection when you plug them back in. Look at the connectors and see if they move in and out easily. They should not. Sometimes guys pull on these connector wires to help unplug a connector.

09-19-2019, 05:58 PM	#14
Rock-It Man 376 cubic inches of fun Drives: 2023 Camaro ZL1 A10 Join Date: Jul 2010 Location: MA Posts: 4,033 View My Garage	You should be checking the injector wire harness for damage.