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Oil in Spark Plug Wells #5262743 11/09/19 07:28 PM
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Gebo Offline OP
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What is involved in repairing ‘09 Highlander where #3 & #4 spark park wells have oil in them?


'98 LEX LS400 310K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 75K

Shell Gas and Truck 5w-30
Amsoil OE 10w-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Oil in Spark Plug Wells [Re: Gebo] #5262748 11/09/19 07:33 PM
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JTK Offline
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Riser tube seals?

They're separate components on some and part of the cam cover on others.


2019 Nissan Pathfinder SV
2017 Ram 1500 4x4, 3.6L.
2015 Nissan Versa 1.6 S
Re: Oil in Spark Plug Wells [Re: Gebo] #5262749 11/09/19 07:34 PM
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TmanP Offline
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Just a guess but I'd imagine the valve cover gaskets are leaking or weeping. That'd not be a hard repair on some cars, but if it's the V6, the back side might be hard to get to.
Could definitely be something else but that'd be most likely, probably. Look for leaks first.

Last edited by TmanP; 11/09/19 07:34 PM.

2012 Toyota Camry 2.5 60,000 mi
2015 Chevy Silverado LT Z71 5.3 V8 50,000 mi
2010 Toyota Sienna 3.5 V6 200,000 mi
Re: Oil in Spark Plug Wells [Re: Gebo] #5262777 11/09/19 08:03 PM
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IronMaidenRules Offline
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+1 for valve cover gaskets. I'd bet money on it.


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Re: Oil in Spark Plug Wells [Re: Gebo] #5262807 11/09/19 08:45 PM
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Gebo Offline OP
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I was told I’d have to replace the heads.


'98 LEX LS400 310K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 75K

Shell Gas and Truck 5w-30
Amsoil OE 10w-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Oil in Spark Plug Wells [Re: Gebo] #5262838 11/09/19 09:16 PM
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austinlunsford Offline
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On a Ford Focus I had, it was the valve cover gasket


1997 F250 HD 7.3: Delvac 5W-40
2002 F150: M1 HM 0W-20
2003 Taurus: M1 EPHM 5W-20
2016 Renegade: Valvoline Modern Engine 0W-20
Re: Oil in Spark Plug Wells [Re: Gebo] #5262847 11/09/19 09:27 PM
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MParr Online Content
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Valve cover gasket and tube seals.


2019 VW Tiguan SE 2.0 TSI Now: Castrol Pro OE LL IV 0W20 & OE VW
2020 F-150 STX Super Cab 2WD 2.7 Ecoboost. FF & OE filter
Re: Oil in Spark Plug Wells [Re: Gebo] #5262850 11/09/19 09:30 PM
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tiger862 Offline
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On some older Toyota vehicles you have to press the tubes in the head. I have ordered new tubes and put sealer on them. Most of the time you can just replace tube seals in valve covers.


Tiger862
2018 Grand Caravan
Re: Oil in Spark Plug Wells [Re: Gebo] #5262859 11/09/19 09:44 PM
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Originally Posted by Gebo
I was told I’d have to replace the heads.



I'd pull the valve covers off and see what's up.


Without data you're just another person with an opinion. W. E. Deming


2004 Corolla 125,000 miles
2004 Rav4 399,852 miles (RIP)
2015 Camry 101,000 miles
2020 Rav4 6,000 miles
Re: Oil in Spark Plug Wells [Re: Gebo] #5262936 11/10/19 12:36 AM
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user52165 Offline
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Originally Posted by Gebo
I was told I’d have to replace the heads.


Some one a divorce pending or a large boat payment.

Re: Oil in Spark Plug Wells [Re: user52165] #5262939 11/10/19 12:40 AM
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Cdn17Sport6MT Offline
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Suction them out every once in a while with a turkey baster with a small dia rubber tube on the end????


Mazda6 GX (i.e.Sport), 6MT, '17
Moto Guzzi 850 T5 (Euro version), '85
Honda Civic Si (EX 2 dr in the 'States), A/T, '97
Toyota Camry CE, 5MT, '99
Toyota Corolla VE, 4AT, '99
VW (Type2) Kombi, 4MT, '79
Re: Oil in Spark Plug Wells [Re: user52165] #5262981 11/10/19 03:44 AM
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Lolvoguy Online Shocked
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Originally Posted by user52165
Originally Posted by Gebo
I was told I’d have to replace the heads.


Some one a divorce pending or a large boat payment.

+1
I doubt Toyota would design something needlessly complex and labor intensive to rectify.


06 Lexus IS350- Wife
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Re: Oil in Spark Plug Wells [Re: Gebo] #5263223 11/10/19 11:07 AM
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Guessing it's valve cover gaskets too, not enough information for more diagnosis.

Intake manifold - on the right inner fender the wiring harness bracket can be removed to allow the left hand to guide the socket, knuckle adapter, and extension down onto the difficult side bolt--from right hand coming from straight above. On the Sienna there is a brake type line at the firewall you can follow to find that bolt position, not sure how it is on the Highlander.

You also will likely want to remove the wiper cowel for more room, easy once you resigned to it.

The wiring harness is right down snug to the rear valve cover, and I really lack experience with the fasteners, so I figured the next spark plug change I might change the valve cover gasket being I have no issues. A few instructional video's out there, just watch several and it's probably a little easier on a Highlander.

Re: Oil in Spark Plug Wells [Re: Gebo] #5264945 11/12/19 12:24 PM
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Gebo Offline OP
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Spoke directly with mechanic and he thinks the actually spark plug tubes have come loose from the head allowing the oil to come in. He spoke with another tech and they only give it a 30% chance that the gaskets will stop the oil from leaking into the spark plug wells.

I have never heard of such a thing.


'98 LEX LS400 310K
'02 4Runner 250K
'05 Lex LS430 90K
'07 Lex GX470 75K

Shell Gas and Truck 5w-30
Amsoil OE 10w-30
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Oil in Spark Plug Wells [Re: Gebo] #5264978 11/12/19 01:01 PM
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Cdn17Sport6MT Offline
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This is possible. On my '99 Camry (if memory serves) there was a mistake on the tightening torque for the sealing nuts on the tops of the tubes (again, if memory serves, this is at least in part how the valve cover is held onto the cylinder head.... or it could be daughter no. 2's 2005 Corolla?)... The earlier specified torque was higher than the subsequently spec'd torque, thereby potentially loosening the tubes' fitment in the head).


Mazda6 GX (i.e.Sport), 6MT, '17
Moto Guzzi 850 T5 (Euro version), '85
Honda Civic Si (EX 2 dr in the 'States), A/T, '97
Toyota Camry CE, 5MT, '99
Toyota Corolla VE, 4AT, '99
VW (Type2) Kombi, 4MT, '79
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