Colder plugs for 6.2. Help.

[08grey]

Still suffering from pre-ignition on my 6.2. I've had Justin in person it and now with the crappier winter has it is still prevalent. I would like to run colder plugs to help. All the NGK I see for my truck say they are rated the same heat of 5. I know this number varies by brand and wondering if anyone has any experience that they can share?

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[kbuskill]

Still suffering from pre-ignition on my 6.2. I've had Justin in person it and now with the crappier winter has it is still prevalent. I would like to run colder plugs to help. All the NGK I see for my truck say they are rated the same heat of 5. I know this number varies by brand and wondering if anyone has any experience that they can share?

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I assume your running 93 Oct or something similar.

How many miles on the truck?

Does it use any oil?

Do you have a catch can?

Sorry I can't help with the NGK plug question... I only run AC Delco in GM.

 

[thompsoj22]

does it do it constantly or only when lugging/pulling/hard accellerating? if your hearing pinging as your driving down the residential street at 25 mph plugs wont correct that. run the tank of fuel out of it and go get a couple bottles of octane boost and put them in with a tank of premium and change where you buy gas. unless your current plugs are degraded to a point of misfiring i just dont think a colder plug will prevent a pre ignition symptom. what plugs are currently installed? have you inspected them for cracked insulator,pitting? ie' signs of preignition.

 

[gpracer1]

Preignition can be signs of carbon buildup. Time to do a sea foam upper engine clean, sucking in fluid directly into the intake. Google it.
Then run a tank of premium with either sea foam or Techron concentrate.

 

[kbuskill]

Preignition can be signs of carbon buildup. Time to do a sea foam upper engine clean, sucking in fluid directly into the intake. Google it.
Then run a tank of premium with either sea foam or Techron concentrate.

That is why I asked about the mileage/condition of the engine.

I use water through the PCV hose directly into the intake to clean the carbon. Seafoam works too... OR Kreen.

 

[gooffeyguy]

If it's flexfuel, run a tank or two of E85

2001 Yukon SLT
2012 Yukon XL Denali
2011 Yukon Denali RIP 5/20/18

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[08grey]

It get top end cleaned frequently. Truck has 105k on it. Pings when in in their gear pulling. I think my cats are pretty hurt and it has to do with heat. Justin heard it when in person tuning and tried to dial it out. Says it's mainly cause the gas was poor. Yes I run 93. I have tried several top tier stations over the years and have my choice places. I am running NGK I think iridium. Whatever was the best NGK plug is what's in there. New like 15k miles ago.

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[kbuskill]

Not knocking you or saying it's your problem but I run AC Delco iridium plugs.

I believe NGK plugs are great for what they were designed for and I always ran them in my Japanese cars/trucks (Toyotas, Nissan, Honda) and my motorcycle (Honda).

Just my 2 bits... YMMV

 

[08grey]

I think NGK actually make the acdelco plugs.

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[kbuskill]

I think NGK actually make the acdelco plugs.

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Never heard that before... I guess I shouldn't be surprised... everything comes from overseas now days it seems.

 

[Rocket Man]

Colder plugs can help with preignition, but usually they aren’t needed unless you’re boosted. Have you asked Justin for his recommendation? My Whipple instructions stated for me to drop 2 heat ranges and go with NGK TR7’s but when I was having some rough running issues he told me TR6’s would be better in his opinion. TR5 are stock for my 6.0. If TR5’s are listed as compatible for a 6.2 then you could try the TR6’s. The letters after TR6/TR5 are the type, IX are iridium, no suffix is regular type, etc. I run the regular TR6 on my blown 6.0.
Edit: I looked up plugs for an 08 Tahoe with a 6.2 on Rockauto and they list the NGK 2238 which shows an alternate p/n as TR5 so you can run the TR6’s. Since it’s an experiment you can just try the regular TR6’s since they’re only about $1.50 each if you want. That’s the part number you need to ask for, or TR6IX if you want iridium. Don’t let them ask you for the make year and engine or they’ll say they’re not the right plugs for you.

 

[swathdiver]

Was it pinging before the tune too? With Top Tier 93 gasoline other than Shell? How about on E85? Do you have that available where you live or Sunoco's 100 unleaded?

We used to run NGK splitfires when they first came out many moons ago in our Buicks. They were good for about a tenth in the quarter mile but cost us about 3 mpg. They were much more sensitive to octane and good quality fuel too, eventually I switched back to plain old stock AC Delco plugs.

You may want Justin to pull the timing a little if you have an AutoCal.

 

[randeez]

Colder plugs can help with preignition, but usually they aren’t needed unless you’re boosted. Have you asked Justin for his recommendation? My Whipple instructions stated for me to drop 2 heat ranges and go with NGK TR7’s but when I was having some rough running issues he told me TR6’s would be better in his opinion. TR5 are stock for my 6.0. If TR5’s are listed as compatible for a 6.2 then you could try the TR6’s. The letters after TR6/TR5 are the type, IX are iridium, no suffix is regular type, etc. I run the regular TR6 on my blown 6.0.
Edit: I looked up plugs for an 08 Tahoe with a 6.2 on Rockauto and they list the NGK 2238 which shows an alternate p/n as TR5 so you can run the TR6’s. Since it’s an experiment you can just try the regular TR6’s since they’re only about $1.50 each if you want. That’s the part number you need to ask for, or TR6IX if you want iridium. Don’t let them ask you for the make year and engine or they’ll say they’re not the right plugs for you.

Yep, with NGK plugs the next number up is colder. I have tr6ix in mine atm to see if it made any difference from the ac delco 41 110 I think

Also there is a tr55ix that is heat range 5 but is gapped larger, it's not in between 5 and 6, you dont want that

 

[mikeyss]

My 6.2 is blackbear tuned, and I have never heard any pinging or anything out of the norm. I run mostly E85. Do you have other mods to yours? The only noise my 6.2 makes is piston slap/maybe lifter noise when it's cold, but all that goes away when it's at operating temp.

 

[08grey]

Colder plugs can help with preignition, but usually they aren’t needed unless you’re boosted. Have you asked Justin for his recommendation? My Whipple instructions stated for me to drop 2 heat ranges and go with NGK TR7’s but when I was having some rough running issues he told me TR6’s would be better in his opinion. TR5 are stock for my 6.0. If TR5’s are listed as compatible for a 6.2 then you could try the TR6’s. The letters after TR6/TR5 are the type, IX are iridium, no suffix is regular type, etc. I run the regular TR6 on my blown 6.0.
Edit: I looked up plugs for an 08 Tahoe with a 6.2 on Rockauto and they list the NGK 2238 which shows an alternate p/n as TR5 so you can run the TR6’s. Since it’s an experiment you can just try the regular TR6’s since they’re only about $1.50 each if you want. That’s the part number you need to ask for, or TR6IX if you want iridium. Don’t let them ask you for the make year and engine or they’ll say they’re not the right plugs for you.

I don't honestly know if it pinged before the tune. I tuned it right after I got it. I took it for a in person tune after I realized it pinged with Justin and he saw it on the pc and tried to tune it out. My truck is an 08 and does not use e85. On justins recommendation I would add three gallons of e85 to a fill up of 93 to raise the octane but that is relatively hard to do because where I live e85 is non existent. He did say that the gas I was running was poor and I have been only on top tier 93 the entire time. Truck still runs great motor is a little noisy...piston slap lifters.. I hear it ping when pulling off of the reflection of sound from a highway barrier or parked cars. My truck is too loud to hear it straight away. I will try the cooler plug you recomend and advise.

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[swathdiver]

I don't honestly know if it pinged before the tune. I tuned it right after I got it. I took it for a in person tune after I realized it pinged with Justin and he saw it on the pc and tried to tune it out. My truck is an 08 and does not use e85. On justins recommendation I would add three gallons of e85 to a fill up of 93 to raise the octane but that is relatively hard to do because where I live e85 is non existent. He did say that the gas I was running was poor and I have been only on top tier 93 the entire time. Truck still runs great motor is a little noisy...piston slap lifters.. I hear it ping when pulling off of the reflection of sound from a highway barrier or parked cars. My truck is too loud to hear it straight away. I will try the cooler plug you recomend and advise.

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If the motor runs good, as good as you know, maybe it needs new cats? Can you get access to a scan tool to see how the downstream O2 sensors are performing? L92 motor right? Something is not right, it should not be pinging on 93 octane while cruising or even under light throttle.

 

[kbuskill]

When you say pinging... can you actually hear it or see it as knock retard on a scanner OR both???

The knock sensors are kind of sensitive... even a loose heat shield or something like that rattling around on the engine can be picked up by them and cause the ECM to cut/retard the timing.

 

[08grey]

Just hear it. I brought the cooler plug. Gonna install today.

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[08grey]

Turns out I had acdelco plugs not the NGK equivalents.

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[swathdiver]

Turns out I had acdelco plugs not the NGK equivalents.

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What were they gapped at? Should be .040" but some old timers might have redone them to .060". Those 41-110s come already gapped and should only be checked and not adjusted (unless you know how to do it and not damage the electrode).