Black Spark Plugs / Stalls in a few secs - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

SlowLS1 · 03-12-2024, 05:53 PM

Are all 8 cylinders looking like this? While 87 octane is not optimal, it's shouldn't cause this. I believe something else is going on.

Bad primary 02 sensors? Bad MAF? Bad MAP? Is fuel pressure in spec? Get a good scanner on it to log some data and see where the misbehavior is coming from.

FasNuf · 03-12-2024, 06:18 PM

Bad primary 02 sensors? Bad MAF? Bad MAP? Is fuel pressure in spec? Get a good scanner on it to log some data and see where the misbehavior is coming from.[/QUOTE]
I thought this too, but he says his LTFT's are good. If they're within 3% or so it shouldnt cause this, but then again oil consumption I would think would look wet unless it was just a small amount coking on the plugs.

Diablo4 · 03-12-2024, 09:33 PM

Quote:

Originally Posted by chevy pilot

What is sparkpark plug name and type ?

First time when i found black plugs there were ACDELCO 41162. Two times already i install SKP SP1019 and regap to 0,9mm

both are iridium

PaulsSS · 03-12-2024, 09:55 PM

One cylinder is @ 116 psi? If it is thats way too low and probably has piston-ring land damage.

Diablo4 · 03-12-2024, 11:13 PM

Quote:

Originally Posted by FasNuf

There is no cylinder pressure spec in the SM that I see, just compression ratio.
L99 is 10.41 compression on a stock engine so I assume yours is.

Make sure all the plugs are out and the TB is wide open to allow air into the engine.
Disable the ignition system.
4 compression strokes are needed for a good test.
Minimum compression shouldnt be less than 70% of the highest reading.

In my case it was 82% (from 11,5 to 14) but that was about 1.5 years ago. But I will check it again when the opportunity arises

Diablo4 · 03-12-2024, 11:17 PM

Quote:

Originally Posted by FasNuf

It's just weird to me that the car stalls after warming up a little. I doubt its a compression problem,, but you said the LTFT's were good? What were they? It almost sounds like the car doesnt like going into closed loop.

I don’t remember the exact readings now but I remember very well that the engine ran slightly lean, as it should be. Before cleaning the injectors, the fuel/air mixture was slightly rich, but after that cleaning was found normal.

I'll check when I'm home and let you know the results.

Diablo4 · 03-12-2024, 11:30 PM

Quote:

Originally Posted by SlowLS1

Are all 8 cylinders looking like this? While 87 octane is not optimal, it's shouldn't cause this. I believe something else is going on.

Bad primary 02 sensors? Bad MAF? Bad MAP? Is fuel pressure in spec? Get a good scanner on it to log some data and see where the misbehavior is coming from.

I have no cats and CEL disabled, ECU was tuned up. But car runs like this about 8 years and I own it for 3 years, never had a problems. Fuel economy is good 14,9 mpg / combined.

Yes, all 8 cylinders looking like this.

Fuel pressure 57 psi on idle. As i know on high rpm it should be less.

I have the second reserve MAF - Delphi AF10142, can try it but it seems that engine runs more rough with this MAF

chevy pilot · 03-13-2024, 04:25 AM

Quote:

Originally Posted by Diablo4

about 30 miles on highway.

That's a long enough trip that the engine doesn't run too cold.

Btw. You had before engine stalling and vibration between 50-60mph.
Are they gone ?

acutron42 · 03-13-2024, 04:52 AM

Does your oil smell like fuel?

SlowLS1 · 03-13-2024, 06:09 AM

Maybe I missed it, but is your mod list for this car? Might shine some light on the topics.

Diablo4 · 03-13-2024, 10:21 AM

Quote:

Originally Posted by SlowLS1

Maybe I missed it, but is your mod list for this car? Might shine some light on the topics.

No, it's 100% stock. except deleted cats, AFM disabled by Range.

Diablo4 · 03-13-2024, 10:26 AM

Quote:

Originally Posted by chevy pilot

That's a long enough trip that the engine doesn't run too cold.

Btw. You had before engine stalling and vibration between 50-60mph.
Are they gone ?

Yes and no) Vibrations go away if I use the shift paddles. In this case, 1) the AFM is turnes off (I have it turned off with Range but the device may malfunction) and 2) the torque converter lock-up solenoid is activated. I have never found the cause of these random vibrations.

At the moment they are not there, they have disappeared and appear rarely from time to time

Diablo4 · 03-13-2024, 10:28 AM

Quote:

Originally Posted by acutron42

Does your oil smell like fuel?

I don't think so, at least the filler cap doesn't smell. The oil is not liquefied, as if fuel had gotten into it, I can see this from the oil pressure gauge.

Diablo4 · 03-13-2024, 10:32 AM

I was told to check the resistance of Cooling Temp Sensor and check that it's value corresponds to the correct temperature...

I've replaced my coolant sensor before this winter because I accidentally broke my old one. But I installed the original one ACDELCO 2134514......
(almost original except for GM 2134333)

I found this table and going to check this at weekends.

Also I have a little bit air in the cooling system, I can hear it in the mornings

03-12-2024, 05:53 PM	#15
SlowLS1 Drives: 2010 Camaro SS , 2011 Colorado LS1 Join Date: Jan 2022 Location: Greenville, SC Posts: 831	Are all 8 cylinders looking like this? While 87 octane is not optimal, it's shouldn't cause this. I believe something else is going on. Bad primary 02 sensors? Bad MAF? Bad MAP? Is fuel pressure in spec? Get a good scanner on it to log some data and see where the misbehavior is coming from. __________________

03-12-2024, 06:18 PM	#16
FasNuf Drives: 2014 Camaro ZL1 Join Date: Jul 2019 Location: Oregon Posts: 1,619 View My Garage	Bad primary 02 sensors? Bad MAF? Bad MAP? Is fuel pressure in spec? Get a good scanner on it to log some data and see where the misbehavior is coming from.[/QUOTE] I thought this too, but he says his LTFT's are good. If they're within 3% or so it shouldnt cause this, but then again oil consumption I would think would look wet unless it was just a small amount coking on the plugs. __________________ . . . . https://www.youtube.com/channel/UCgN...etl17hA/videos

03-13-2024, 04:52 AM	#23
acutron42 Drives: 2013 Camaro 2SS AGM Join Date: Apr 2020 Location: WNY Posts: 733	Does your oil smell like fuel? __________________ 2013 2SS GPI built & tuned 415, spec'd by Andrew Cammer. GPI ported intake/tb/heads, Tooley springs, CHE trunnions, Callies rotating assembly, Diamond pistons, GPI SS3 VVT, ATI 10% ud damper, Circle D 3800, Kooks ceramic coated lt's with green cats, Mishimoto rad & oil cooler, Derale trans cooler, Holley efi rails.

03-13-2024, 06:09 AM	#24
SlowLS1 Drives: 2010 Camaro SS , 2011 Colorado LS1 Join Date: Jan 2022 Location: Greenville, SC Posts: 831	Maybe I missed it, but is your mod list for this car? Might shine some light on the topics. __________________

03-13-2024, 10:32 AM	#28
Diablo4 Drives: 2011 Chevrolet Camaro SS A/T Join Date: Aug 2022 Location: Wyoming, Kirby Posts: 45	I was told to check the resistance of Cooling Temp Sensor and check that it's value corresponds to the correct temperature... I've replaced my coolant sensor before this winter because I accidentally broke my old one. But I installed the original one ACDELCO 2134514...... (almost original except for GM 2134333) I found this table and going to check this at weekends. Also I have a little bit air in the cooling system, I can hear it in the mornings Attached Images

03-12-2024, 09:55 PM	#18
PaulsSS Drives: 15SS Camaro Join Date: Dec 2020 Location: US Posts: 346	One cylinder is @ 116 psi? If it is thats way too low and probably has piston-ring land damage.