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Oil in Spark Plug Wells #5262743 11/09/19 06:28 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 300K
'02 4Runner 245K
'05 Lex LS430 85K
'07 Lex GX470 65K

Shell Gas and Truck & Supertech Full Syn HM
Toyota ATF's and Coolant
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Re: Oil in Spark Plug Wells [Re: Gebo] #5262748 11/09/19 06:33 PM
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JTK Online Content
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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 06:34 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 06:34 PM.

2012 Toyota Camry 2.5 30,000 mi
2015 Chevy Silverado LT Z71 5.3 V8 30,000 mi
2010 Toyota Sienna 3.5 V6 150,000 mi
Re: Oil in Spark Plug Wells [Re: Gebo] #5262777 11/09/19 07:03 PM
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IronMaidenRules Offline
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+1 for valve cover gaskets. I'd bet money on it.


'04 Mazda6 V6 wagon 5-spd.
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Re: Oil in Spark Plug Wells [Re: Gebo] #5262807 11/09/19 07:45 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 300K
'02 4Runner 245K
'05 Lex LS430 85K
'07 Lex GX470 65K

Shell Gas and Truck & Supertech Full Syn HM
Toyota ATF's and Coolant
Amsoil Gear Oil and Grease
Re: Oil in Spark Plug Wells [Re: Gebo] #5262838 11/09/19 08:16 PM
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austinlunsford Offline
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On a Ford Focus I had, it was the valve cover gasket


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Re: Oil in Spark Plug Wells [Re: Gebo] #5262847 11/09/19 08:27 PM
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MParr Offline
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Valve cover gasket and tube seals.


2019 VW Tiguan SE Now: Mobil 1 ESP 5W30 & OE VW/Mann
2017 Ford Escape SE 2.0T Now: Motorcraft 5W30 SynBlend & NAPA Gold 1348
Re: Oil in Spark Plug Wells [Re: Gebo] #5262850 11/09/19 08:30 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.


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2018 Grand Caravan
Re: Oil in Spark Plug Wells [Re: Gebo] #5262859 11/09/19 08:44 PM
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Leo99 Offline
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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

2003 Corolla 250,000 miles (RIP)
2004 Corolla 125,000 miles
2004 Rav4 392,000 miles
2015 Camry 90,000 miles
Re: Oil in Spark Plug Wells [Re: Gebo] #5262936 11/09/19 11:36 PM
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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 11/09/19 11:40 PM
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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????


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Re: Oil in Spark Plug Wells [Re: user52165] #5262981 11/10/19 02:44 AM
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Lolvoguy Offline
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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
88 BMW 325is- Mistress
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Re: Oil in Spark Plug Wells [Re: Gebo] #5263223 11/10/19 10:07 AM
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Supersonic Offline
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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.

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