2007 4.7 DC Limited Spark plug Replacement WTF!!!??!! - TundraTalk.net - Toyota Tundra Discussion Forum
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#1 (permalink) Old 06-11-2010, 11:04 PM
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2007 4.7 DC Limited Spark plug Replacement WTF!!!??!!

Hey All,
Have 67K, and started replacing the plugs. Didn't realize the Iridiums went 100K. I was able to change 6 0f 8. If your looking at the front of the engine, plug 3 on either side is underneath what looks to be some sort of coolant pump. It's held on by 3 nuts, but after removing these it still won't move due to the metal tubing. How do you get around this? There are some bolts that hold the tubing to the "pump", are there any repercusions to unbolting this tubing? Will coolant spill all over? Will the coolant system need to bled? Searched the forums, but most post are about what type of plugs, not replacing the plugs. Stellar engineering strikes again


Mike
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#2 (permalink) Old 06-12-2010, 08:56 PM
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Has anyone replaced the plugs on a 07 - 09 4.7?
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#3 (permalink) Old 06-12-2010, 10:16 PM
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Bump for some help......

I would like to know this myself in case I ever buy a 4.7
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#4 (permalink) Old 06-15-2010, 05:04 PM
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Its NOT a part of the cooling system. What you are looking at is for the secondary air injection system and in order to change those plugs you need to REMOVE them. Unscrew the metal pipe that goes to it, remove the 3 bolts. Should come right off, if the nut on the metal pipe seems tight spray with DW-40 and let soak and try again. There is a gasket on the bottom of those secondary air injection valves, dont loose this and make sure you reinstall it!

Hope this helps!

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#5 (permalink) Old 06-15-2010, 06:36 PM
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Quote:
Originally Posted by mnoll406 View Post
Hey All,
Have 67K, and started replacing the plugs. Didn't realize the Iridiums went 100K. I was able to change 6 0f 8. If your looking at the front of the engine, plug 3 on either side is underneath what looks to be some sort of coolant pump. It's held on by 3 nuts, but after removing these it still won't move due to the metal tubing. How do you get around this? There are some bolts that hold the tubing to the "pump", are there any repercusions to unbolting this tubing? Will coolant spill all over? Will the coolant system need to bled? Searched the forums, but most post are about what type of plugs, not replacing the plugs. Stellar engineering strikes again


Mike
Did you read the owners manual?


2009 Tundra CrewMax 5.7L 4x4 SR5 TRD in Pyrite Mica
Tundra owner since May '09
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#6 (permalink) Old 06-15-2010, 06:45 PM
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Ill bet they looked like they needed replaced when he took them out. Toyota recommends 100k on the plugs, but i have seen them look pretty bad earlier then 100k miles.

2010 DC 5.7L 4x2

Current mods:
TRD Supercharger
Rev-Tech 3" lift
Fuel Octane 20x9 wheels
Nitto Terra Grappler 305/55/20
5% all windows 35% windshield
Sequoia front door handles
Color matched grille, no more chrome
DDM Tuning 55w 6000k low beams
DDM Tuning 35w 6000k fog lights

Future mods:
BHLM
Exhaust
Interior (leather seats and suede headliner)
Stereo
Front and rear strobe light kit
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#7 (permalink) Old 06-15-2010, 09:50 PM
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Hey Ripcord,
I have perused the owners manual,and saw something about 30,000 miles, so figured by 67K they were due. I have seen an improvement mileagewise from 15 mpg, to around 16.9 since the replacement of 6 of 8 sparkplugs.

Toyodatech79,
Thanks a million, I will replace the other 2 tonight. Not sure why Toyotas engineers would place the secondary air pump directly above the sparkplug. At least it's not a coolant pump. The plugs looked ok, but the mileage is better after replacing 6 0f 8. Thanks again for the help

Mike
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#8 (permalink) Old 06-16-2010, 12:43 PM
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Quote:
Originally Posted by mnoll406 View Post
Hey Ripcord,
I have perused the owners manual,and saw something about 30,000 miles, so figured by 67K they were due. I have seen an improvement mileagewise from 15 mpg, to around 16.9 since the replacement of 6 of 8 sparkplugs.

Toyodatech79,
Thanks a million, I will replace the other 2 tonight. Not sure why Toyotas engineers would place the secondary air pump directly above the sparkplug. At least it's not a coolant pump. The plugs looked ok, but the mileage is better after replacing 6 0f 8. Thanks again for the help

Mike
Mike.....

No problem man, its not actually the secondary air PUMP though, the air pump is located in the right front inner fender, and you access it by removing or partially removing inner fender liner. What you are removing is just the air valves for the secondary air system. If you have more questions, just ask!

2010 DC 5.7L 4x2

Current mods:
TRD Supercharger
Rev-Tech 3" lift
Fuel Octane 20x9 wheels
Nitto Terra Grappler 305/55/20
5% all windows 35% windshield
Sequoia front door handles
Color matched grille, no more chrome
DDM Tuning 55w 6000k low beams
DDM Tuning 35w 6000k fog lights

Future mods:
BHLM
Exhaust
Interior (leather seats and suede headliner)
Stereo
Front and rear strobe light kit
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#9 (permalink) Old 06-17-2010, 11:31 AM
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Hey Toyodatech79,
Replaced those 2 plugs last night, thanks again for the help. Toyota must have changed the paper gaskets to metal. After removing the first valve I thought I lost the paper gasket, but there was a metal gasket with with a clip system that allows it to adhere to the valve. I then proceeded to remove the other one much slower, and verified the metal one was the only one. I ended up using Bosch platinum 4's. Autozone didn't have the NGK's when I went to get the plugs. I'll let everybody know how they do. So far the fuel economy is a little better. This may be due to the plugs being new also though. Now to upgrade my diff, and transfer case lube to Amsoil.

Mike
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#10 (permalink) Old 08-10-2010, 07:10 AM
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Quote:
Originally Posted by mnoll406 View Post
Hey Toyodatech79,
Replaced those 2 plugs last night, thanks again for the help. Toyota must have changed the paper gaskets to metal. After removing the first valve I thought I lost the paper gasket, but there was a metal gasket with with a clip system that allows it to adhere to the valve. I then proceeded to remove the other one much slower, and verified the metal one was the only one. I ended up using Bosch platinum 4's. Autozone didn't have the NGK's when I went to get the plugs. I'll let everybody know how they do. So far the fuel economy is a little better. This may be due to the plugs being new also though. Now to upgrade my diff, and transfer case lube to Amsoil.

Mike
Dude...you're gonna need to start calculating in WPGs Weeks per gallon!!
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#11 (permalink) Old 08-10-2010, 09:36 AM
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Originally Posted by mnoll406 View Post
Hey Ripcord,
I have perused the owners manual,and saw something about 30,000 miles, so figured by 67K they were due.

The 4.0 V6 is due at 30, they changed this for 2011
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#12 (permalink) Old 08-13-2010, 02:45 PM
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Bosch?

Quote:
Originally Posted by mnoll406 View Post
I ended up using Bosch platinum 4's. Autozone didn't have the NGK's when I went to get the plugs. I'll let everybody know how they do. So far the fuel economy is a little better. This may be due to the plugs being new also though. Now to upgrade my diff, and transfer case lube to Amsoil.

Mike
I for one would be curious as to the Bosch's longevity.
I just turned 40K on my '07 4.7L. Have always used NGK or ND in past Toys.
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