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#944546 - 05/10/09 06:38 AM Spark plugs for a 2007 Tacoma 4.0L  
Jeff the marmot  Offline

Roll Me Over
Joined: Feb 2000
Posts: 4,690
Thornton, Colorado *****
I did a search here for any info regarding the spark plugs for the 4.0L V6 (1GR-FE) in the 2005 and newer Tacomas, but I didn't find any spark plug info. I just changed the plugs so here's some basics...

In my 2007 Tacoma the owners manual specifies a spark plug gap of 0.043".

The passenger side cylinders originally had Denso K20HR-U11. After the first 33K miles of use, these were worn down to about 0.046" gap. It's a single ground plug. The passenger side plugs are very easy to access with the air filter housing removed (from the air filter itself to the fender).

The driver side cylinders originally had NGK LFR6C-11. After the first 33K miles of use, these were very worn to a gap of about 0.053". After seeing how large the gaps were on this side, I was surprised I didn't have any driveability problems recently. These plugs are also single ground. All 3 plugs on the driver's side were a PITA due to the proximity of the intake manifold and supporting brackets above/over the coils and associated electrical connectors. Once you get the dang electrical connectors separated and the coils pulled out, then the removal/replacement of the plugs themselves was easy.

All 6 cylinders had their own coil above the spark plug, so no more spark plug wires like on earlier engines. I think this also helps to explain why only single ground plugs are recommended for this engine. I checked into various upgraded plugs and I saw only single ground plugs listed for this engine.

I replaced all 6 spark plugs with NGK "Laser Platinum" PLFR6A-11 which is their stock #7654. These are also single ground plugs. I drove it some today and it drives great so far. These plugs come gapped at 0.042" so I installed them as is. Knowing that I should be able to go at least 60K miles with these platinum plugs, I'm relieved I don't have to mess with the driver's side plugs for a long time again. Even then, I'm sure I'll be checking the condition of the passenger side plugs before I succumb to the pressure to mess with the drivers side plugs again. <img src="/forums/images/graemlins/shiner.gif" alt="" />

The thing that shocked me the most was that Toyota still puts NGK plugs on one side and Denso on the other. I don't see a good reason for that anymore on this engine. The previous generation of Tacomas and 4Runners with the 3.4L V6 similarly came from the factory with both NGK and Denso's. Years ago people guessed the engine might run better with a certain type of plug on one side, since that engine only has coils above 3 of the plugs and then plug wires to the other side. Those plugs are also recommended to be 2-ground plugs on that engine due to the way the one coil gives the spark to 2 cylinders. I have used NGK Laser Platinums on my 2000 4Runner for many years and had NO problems with those 2-ground plugs in that engine. I did have pinging problems when I tried Iridiums in the 3.4L, so I knew to avoid those also in my 2007 Tacoma.


Jeff
2000 4Runner SR5, supercharger, rear e-locker, ARB front locker, 285/75R16 MT/R's, custom bumpers & skids
2007 Tacoma double cab 4x4 - stock

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#944547 - 05/11/09 03:33 PM Re: Spark plugs for a 2007 Tacoma 4.0L [Re: Jeff the marmot]  
Mark in AZ  Offline
Toyota Moderator
Joined: Jul 2002
Posts: 1,592
Chandler, AZ
I'd like to know the answer to the plug question too. <img src="/forums/images/graemlins/wink.gif" alt="" />


Wheeling a Stepside Tacoma on 37s
Exploring in a T4R Ltd V8

#944548 - 05/11/09 05:35 PM Re: Spark plugs for a 2007 Tacoma 4.0L [Re: Jeff the marmot]  
Greg_Canada  Offline
Roll Me Over
Joined: Aug 2003
Posts: 2,854
Toronto, Canada
Quote
I did a search here for any info regarding the spark plugs for the 4.0L V6 (1GR-FE) in the 2005 and newer Tacomas, but I didn't find any spark plug info. I just changed the plugs so here's some basics...

In my 2007 Tacoma the owners manual specifies a spark plug gap of 0.043".

The passenger side cylinders originally had Denso K20HR-U11. After the first 33K miles of use, these were worn down to about 0.046" gap. It's a single ground plug. The passenger side plugs are very easy to access with the air filter housing removed (from the air filter itself to the fender).

The driver side cylinders originally had NGK LFR6C-11. After the first 33K miles of use, these were very worn to a gap of about 0.053". After seeing how large the gaps were on this side, I was surprised I didn't have any driveability problems recently. These plugs are also single ground. All 3 plugs on the driver's side were a PITA due to the proximity of the intake manifold and supporting brackets above/over the coils and associated electrical connectors. Once you get the dang electrical connectors separated and the coils pulled out, then the removal/replacement of the plugs themselves was easy.

All 6 cylinders had their own coil above the spark plug, so no more spark plug wires like on earlier engines. I think this also helps to explain why only single ground plugs are recommended for this engine. I checked into various upgraded plugs and I saw only single ground plugs listed for this engine.

I replaced all 6 spark plugs with NGK "Laser Platinum" PLFR6A-11 which is their stock #7654. These are also single ground plugs. I drove it some today and it drives great so far. These plugs come gapped at 0.042" so I installed them as is. Knowing that I should be able to go at least 60K miles with these platinum plugs, I'm relieved I don't have to mess with the driver's side plugs for a long time again. Even then, I'm sure I'll be checking the condition of the passenger side plugs before I succumb to the pressure to mess with the drivers side plugs again. <img src="/forums/images/graemlins/shiner.gif" alt="" />

The thing that shocked me the most was that Toyota still puts NGK plugs on one side and Denso on the other. I don't see a good reason for that anymore on this engine. The previous generation of Tacomas and 4Runners with the 3.4L V6 similarly came from the factory with both NGK and Denso's. Years ago people guessed the engine might run better with a certain type of plug on one side, since that engine only has coils above 3 of the plugs and then plug wires to the other side. Those plugs are also recommended to be 2-ground plugs on that engine due to the way the one coil gives the spark to 2 cylinders. I have used NGK Laser Platinums on my 2000 4Runner for many years and had NO problems with those 2-ground plugs in that engine. I did have pinging problems when I tried Iridiums in the 3.4L, so I knew to avoid those also in my 2007 Tacoma.

When you used iridium's in the S/c'd 3.4, did you use the IK22's (2 steps colder than stock?) if not, that would explain the pinging.


89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim

#944549 - 05/11/09 08:20 PM Re: Spark plugs for a 2007 Tacoma 4.0L [Re: Greg_Canada]  
Jeff the marmot  Offline

Roll Me Over
Joined: Feb 2000
Posts: 4,690
Thornton, Colorado *****
Quote
When you used iridium's in the S/c'd 3.4, did you use the IK22's (2 steps colder than stock?) if not, that would explain the pinging.

I don't remember - I used the ones that Gadget/URD sells with the 3.4L fuel performance kit for the supercharger, which are not the 2-ground spark plugs.


#944550 - 05/12/09 03:46 AM Re: Spark plugs for a 2007 Tacoma 4.0L [Re: Jeff the marmot]  
Greg_Canada  Offline
Roll Me Over
Joined: Aug 2003
Posts: 2,854
Toronto, Canada
Interesting, i've got the same ones, i'll see what happens when i do mine.


89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim

#944551 - 05/13/09 03:12 AM Re: Spark plugs for a 2007 Tacoma 4.0L [Re: Jeff the marmot]  
Hackattack  Offline
Getting the Wheeling Fever
Joined: Jan 2007
Posts: 75
Cincinnati
I just looked at my scheduled maintenance manual for a 08 Double cab and it says to replace the spark plugs every 30,000 miles. What ever happened to the 100,000 mile tune ups? If its as fun to get to the plugs as described above I would not trust any mechanic to do the job. <img src="/forums/images/graemlins/confused.gif" alt="" />


Toyota T100 best truck Toyota ever built "Its so good the frame does not rust in half"


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