What Spark Plugs to Use?

jasonz28camaro · 09-22-2020, 08:17 AM

I'm somewhat new to the DI motors and would like to know what spark plugs you guys are running? Stock or aftermarket and what gap?

I have a NA motor with long tubes running the stock plugs/wires and I'm going to pull them and install new plugs and wires to help trouble shoot some fuel trim issues.

KingLT1 · 09-22-2020, 08:23 AM

Stock plugs are fine for your application.

Joshinator99 · 09-22-2020, 08:56 AM

Agree with King on the stock plugs.

Regarding the fuel trims, was the car tuned after installing the headers? Exhaust leaks seem to be a surprisingly prevalent problem for a lot of aftermarket header & exhaust installs these days, so I’d be double checking to make sure that isn’t the case.

jasonz28camaro · 09-22-2020, 10:12 AM

It’s been tuned. Runs great on maf and map tune then in closed loop it gets funky. Exhaust has been checked for leaks and now I’m more leaning towards a bad o2 or plugs and wires. I have ultimate headers and the DS flange had to be resurfaced, not the best headers I’ve seen.

It’s mostly an issue at idle, everything else if good.

KingLT1 · 09-22-2020, 10:15 AM

If it's mainly idle then it definitely sounds like un-metered air getting in somewhere.

jasonz28camaro · 09-22-2020, 10:35 AM

I had an o2 code for slow switching on bank 2 sensor 1 and it makes me think it could be related. The car can have all LT fuel trims within 2% then the next time I drive it it’s all over the place 4-8% and higher at times even. Could be a combination of a leak and or faulty sensor? I’ll check for leaks again and pull the plugs this afternoon.

jasonz28camaro · 09-22-2020, 11:45 AM

Plugs all look fine. Ohm tested the wires and they are fine. The PS header flange looks like it’s not sitting great on the head, #6 port looks to bowed out just a hair visibly vs the other 3. Might have a resurfacing needed in the near future like the DS header. I spoke to the header manufacturer and he suggested swapping out the o2 sensor first to see if it helps, if not pull the header and check it.

Darth Martel · 09-23-2020, 06:43 AM

Stock plugs are best. Anything else is just gimmick really.

Seems crazy you would need to have your headers resurfaced. Definitely keep in contact with the OEM on that one. However, definitely make sure all your wiring is far away enough from your exhaust and headers. Make sure nothing is melted. It sounds like you don't have a good seal somewhere though. Verify your air intake clamps are tight and everything is sealed up. With everything you've said though, your headers sound like a good candidate for source of the problem.

09-22-2020, 08:17 AM	#1
jasonz28camaro Drives: 2007.5 Duramax Join Date: Nov 2016 Location: Houston Posts: 101	What Spark Plugs to Use? I'm somewhat new to the DI motors and would like to know what spark plugs you guys are running? Stock or aftermarket and what gap? I have a NA motor with long tubes running the stock plugs/wires and I'm going to pull them and install new plugs and wires to help trouble shoot some fuel trim issues. __________________ Built C6Z 600whp NA - SOLD Built LSX 96SS - SOLD 68 Camaro - 6.2/10l80, self built and tuned.

09-22-2020, 08:23 AM	#2
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	Stock plugs are fine for your application. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

09-22-2020, 08:56 AM	#3
Joshinator99 Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018 Location: Petersham MA Posts: 4,761	Agree with King on the stock plugs. Regarding the fuel trims, was the car tuned after installing the headers? Exhaust leaks seem to be a surprisingly prevalent problem for a lot of aftermarket header & exhaust installs these days, so I’d be double checking to make sure that isn’t the case. __________________ 2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors, LPE BB HPFP, 15” conversion *1059 WHP/944 WTQ, 9.48@150*

09-22-2020, 10:12 AM	#4
jasonz28camaro Drives: 2007.5 Duramax Join Date: Nov 2016 Location: Houston Posts: 101	It’s been tuned. Runs great on maf and map tune then in closed loop it gets funky. Exhaust has been checked for leaks and now I’m more leaning towards a bad o2 or plugs and wires. I have ultimate headers and the DS flange had to be resurfaced, not the best headers I’ve seen. It’s mostly an issue at idle, everything else if good. __________________ Built C6Z 600whp NA - SOLD Built LSX 96SS - SOLD 68 Camaro - 6.2/10l80, self built and tuned.

09-22-2020, 10:15 AM	#5
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,800	If it's mainly idle then it definitely sounds like un-metered air getting in somewhere. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

09-22-2020, 10:35 AM	#6
jasonz28camaro Drives: 2007.5 Duramax Join Date: Nov 2016 Location: Houston Posts: 101	I had an o2 code for slow switching on bank 2 sensor 1 and it makes me think it could be related. The car can have all LT fuel trims within 2% then the next time I drive it it’s all over the place 4-8% and higher at times even. Could be a combination of a leak and or faulty sensor? I’ll check for leaks again and pull the plugs this afternoon. __________________ Built C6Z 600whp NA - SOLD Built LSX 96SS - SOLD 68 Camaro - 6.2/10l80, self built and tuned.

09-22-2020, 11:45 AM	#7
jasonz28camaro Drives: 2007.5 Duramax Join Date: Nov 2016 Location: Houston Posts: 101	Plugs all look fine. Ohm tested the wires and they are fine. The PS header flange looks like it’s not sitting great on the head, #6 port looks to bowed out just a hair visibly vs the other 3. Might have a resurfacing needed in the near future like the DS header. I spoke to the header manufacturer and he suggested swapping out the o2 sensor first to see if it helps, if not pull the header and check it. __________________ Built C6Z 600whp NA - SOLD Built LSX 96SS - SOLD 68 Camaro - 6.2/10l80, self built and tuned. Last edited by jasonz28camaro; 09-22-2020 at 12:09 PM.

09-23-2020, 06:43 AM	#8
Darth Martel Darth Martel Drives: Black 1SS with 20% tinted windows Join Date: May 2009 Location: Bizzaroland Posts: 1,496	Stock plugs are best. Anything else is just gimmick really. Seems crazy you would need to have your headers resurfaced. Definitely keep in contact with the OEM on that one. However, definitely make sure all your wiring is far away enough from your exhaust and headers. Make sure nothing is melted. It sounds like you don't have a good seal somewhere though. Verify your air intake clamps are tight and everything is sealed up. With everything you've said though, your headers sound like a good candidate for source of the problem. __________________ 2016 Black 1SS w/ MRC, low-gloss black wheels, auto trans. Self-created custom Dark Knight Edition accents. Rotofab CAI with dry filter and sound tube delete, PRAY ported intake manifold and throttle body, Texas Speed cam, Stainless Works headers and exhaust, Skid Mark garage E85 kit, JMS fuel pump voltage booster, Circle D torque converter. Custom E85/mod tune by Jannetty Racing.

User Name		Remember Me?
Password