75k spark plugs replaced

[Rocket61]

I'm impressed with the difference a set of new plugs makes. Easier starting, better throttle response. Haven't had a chance to test for mpg changes. Replaced with factory plugs from the dealership, $6 each.

I don't have much experience assessing old plugs. How do these look? Are any problems apparent?

 

[jow]

1. What year T4R? Were they originals but I guess not vs not different per brands per bank from the factory.
2. What was the difference in cost of plugs at local auto? The Dealer has advised me to get some identical item at the local autos for less.
3. IMO the plugs d/n look that bad except for the residue/etc on them. What is that? I guess a scope is the true plug test.
4. Did you use anti-seize and the low torque of what? The torque is low but plenty threads.

 

[JacksonRally]

Only problem I see is there are only 6 :hiding:

 

[Code2]

That is a lot of oil on those plugs. Mine never look like that coming out

 

[MikeInNH]

Any new plugs are going to make a vehicle run better if the old ones are really worn. I try not to let mine get that bad.

 

[Rocket61]

1. What year T4R? Were they originals but I guess not vs not different per brands per bank from the factory.
2. What was the difference in cost of plugs at local auto? The Dealer has advised me to get some identical item at the local autos for less.
3. IMO the plugs d/n look that bad except for the residue/etc on them. What is that? I guess a scope is the true plug test.
4. Did you use anti-seize and the low torque of what? The torque is low but plenty threads.

1. 2007. Not originals.
2. I didn't look into prices at local shops. $6 per plug at the dealer isn't that bad IMO.

4. No anti-seize. Torqued to 15 lb-ft.

 

[Rocket61]

That is a lot of oil on those plugs. Mine never look like that coming out

Maybe it's just the high milage this set had on them? Motor is still running strong at 135k and has never given me any trouble.

 

[BCfish]

Only problem I see is there are only 6 :hiding:

Here we go:snacker:

 

[Code2]

Maybe it's just the high milage this set had on them? Motor is still running strong at 135k and has never given me any trouble.

My first set was run 100k and didn't have oil of them at all. those are soaked and I would be at least investigating to make sure something isn't going on. a little oil on the threads isn't worrying as much as the oil on the actual plug as you can see its on the sides on the electrode

 

[Rocket61]

My first set was run 100k and didn't have oil of them at all. those are soaked and I would be at least investigating to make sure something isn't going on. a little oil on the threads isn't worrying as much as the oil on the actual plug as you can see its on the sides on the electrode

Working end of the plug was dry. The black gunk I think you're referring to is carbon buildup, not oil.

 

[scw1991]

good info on p/n's. thanks!

 

[Dylan]

Maybe it's just the high milage this set had on them? Motor is still running strong at 135k and has never given me any trouble.

I bought my car with 140k on the clock. When I changed my plugs they didn't look anywhere close to that bad, and mine were the original as far as I could tell since maintenance history indicated they never replaced.

 

[BCfish]

You can't really compare the V6 and V8 spark plugs by mileage alone being that V6 are done every 30K being copper plugs, where as the v8 is around 100K being iridium plugs. Iridium plugs will not show the wear like copper will.

 

[BlackWorksInc]

You can't really compare the V6 and V8 spark plugs by mileage alone being that V6 are done every 30K being copper plugs, where as the v8 is around 100K being iridium plugs. Iridium plugs will not show the wear like copper will.

This is absolutely true, what MANY people including some of the techs forget is that the older 1GR-FE (Single VVTi engines, the newer Dual VVTi use Iridium IIRC) use copper plugs that are replaced every 30k.

Copper plugs wear differently than Iridium plugs, typically Iridium plugs the only indication you'll see is balling of the electrode tip much like you see when TIG welding on the Tungsten Electrode, sometimes the simple act of balling causes the gap to increase (which I commonly see) as the metal tip actually melts partially over time and this is what forms that small ball.

 

[Dylan]

You can't really compare the V6 and V8 spark plugs by mileage alone being that V6 are done every 30K being copper plugs, where as the v8 is around 100K being iridium plugs. Iridium plugs will not show the wear like copper will.

whatever the case, my point was those plugs look shitty. Change them.

 

[Code2]

Maybe it's just the high milage this set had on them? Motor is still running strong at 135k and has never given me any trouble.

You can see the the very beginning of the electrode shinny black oil which matches the shinny black oil on the threads none of that is carbon.

Either way its your car I am just giving my opinion from changing spark plugs on all kinds of different things never have i seen oil on the threads or at the beginning of the electrode post. Its something I would get looked at to be on the safe side but as I said its your car and you pay the bill therefor its your call.

take a look here will give you a idea what to look for or a general idea of how it should look

 

[BlackWorksInc]

[MENTION=70867]Code2[/MENTION]

Sometimes when the valve cover gaskets start going bad they leak into the spark plug tubes, its somewhat common on higher mileage engines that have holes in the valve cover for the plugs.

 

[Rocket61]

[MENTION=70867]Code2[/MENTION]

Sometimes when the valve cover gaskets start going bad they leak into the spark plug tubes, its somewhat common on higher mileage engines that have holes in the valve cover for the plugs.

Hey thanks for the feedback. I'll definitely look into doing this.