DIY Spark Plug Change Writeup
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2006RX330DIYSparkPlugChangebyALCHEMIST(4/22/13)
Iwanttofirsttaketheopportunitytothankthosethathavehelpedmeinpar6cular
HTOWNBLUEhisadvicewasextremelyhelpfulsomajorpropstoagreat(contribu6ng)forum
member.
Ivolunteeredtodothisforacouplereasons.First,Iwasaskedbyseveraltodothisandthere
werealwaysques6onsonwhethertopulltheintake,fabricateamagicaljointed-extension
socketthingythatwillreacharoundthebackoftheintake,orremovewipercowl.Ichoseto
removetheTB,intakeconnectorassemblyandupperintake(surgetank)andthiscreateda
clearpassagetotherearsparkplugs.Second,Ialsodidthisbecauseitisexpensiveatyour
localLexusdealerrangingfrom$50-$950.Some6mesyoucanfindaspecialthatLexusor
Toyotaisrunningfor~$300butitisrare.Somepeoplechangeat90kmilesothersat120kmiles.Ididmineat107kmiles.
Belowismyexperienceindoingthis.Iwouldrateitonascaleof1-10with10beingmost
difficultprobablya7.Itisnotforthefaintofheartthereisalotofshittoremoveandalotof
coolantlinestorememberwheretoputback.Total6meis~5hrs.Thisisprobablyoneofthe
biggestmaintenance-relatedjobsonthesecarsnexttothe6mingbeltreplacement.
Disclaimer:A]emptatyourownrisk.ThisisthemethodthatIfoundmostusefulandefficient
yoursmaydifferandmaynotbetheexactasdescribedherein.Aswithanydo-it-yourself
project,unfamiliaritywiththetoolsandprocesscanbedangerous.Thisprojectshouldbe
construedastheore6caladvice.***Iwillnotbeheldresponsibleforanyinjuryorenginefailure
duetothemisuseormisunderstandingofthisDIYproject****.
LETSDOTHIS..
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Relevantgaskets(theTBgasket,surgetank(upperintake)gasket,intakeconnector
assemblygasketaswellassurgetankcovergasket)
surgetank(upperintake)gasket
TBgasket
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Mainparts:Densolonglifeiridiums(yourpreferencebetweenDensoandNGK),
PCV(Ichangedmine),upperintake(surgetank-orange)andintakeflange(gray)
gaskets,andTBgasket(notshown).Verybo]omrightissurgetankcovergasket.
Ididnotchangethis.IboughtallthroughRockAuto.Iwontlistalltoolsbecause
itmayvaryforyoubutIwouldsuggestashort(stubby)setofratchetwrenches
inpar6culara12mmand14mmforthebracketsattherearoftheupperintake.
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Iwontspendalotof6mediscussingthefrontsparkplugs.Ifyoucannotdo
thefronts,donota]empttherears.10mmbolts.Makesuretousean6-seize
onthethreadsofallsparkplugsandbecarefulwiththecoilpackconnec6ons,
theyarebri]le.Alsononeedtogaptheiridiumsparkplugs.
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Oldversusnew(notbadfor107kmiles).Theyalllookedthesame.
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Nowfortherear(thatswhatshesaid).Removelinesgoinginto
airbox(airfilterhousing),removetopofairboxandfilter.Iwould
suggestmarkingallofyourlineswithawhitepenortape.
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Loosenandremove
connec6onbetweenair
filterhousingandhose/air
intakeresonatorassembly
andthro]lebody.
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Removelinerunningintofrontvalvecover.
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Andthisline.Ithinkitsthefuelvaporfeed.
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Youllwanttorotateintakeresonatortoremove.Itisa6ghtfitbecauseofthewipercowl.
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Ontheleyoucanseethethro]lebodyexposed.Youdonotneedto
removethelinebehindit.Leavethisinplace.Youalreadyremovedthe
otherendonpage12.
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Hereyoucanseethelineyou
removedonpage12.Justtuckit
awaybackbybrakeboosternearfirewall.Ithinkthisisthefuel
vaporfeedhose.
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ShotofTB.2nutsand2boltstoremove.Andathro]lemotorconnectorat
thebo]omrightaswellascoolantlineatbo]omle.
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RemovecoolantlineunderneathTB
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RemoveTBbracket.
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Otherendofbrackettoremove.Alsoremovecoolantline.
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Removebothhorizontal(showninlastslide)andver6cal
(men6onedearlier)coolantlinesfromTB.Theseare
waterbypasshoses.Puttowelsunderneathbecause
theywillleaklikemofo.
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Removebolts/nuts/connectorandremovethro]lebody.
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Backofit.No6cethegasket.Iwouldsuggestreplacing.
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HereisapicoftheTBandbracketandthecorrespondingbolts/nuts.
NowisagoodopportunitytocleanwithTB/carbcleaner.
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Hereiswhatyouseeoftheintakeconnectorassemblyaeryouremove
TB.Pleasenoteyoullonlysee3boltsthatares6llthere.Ialreadyremoved
1boltat9oclockand1nutat12oclockbeforetakingpics.Alsono6ce
aboveIveremovedlinetouniontocheckvalve
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Anotherlinetoremove.
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Boltsonintakeconnectorassemblyare12mm.Thispics6llhasTBa]ached.
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***Important.Thisisabracket/boltthatholdsthebackofthe
intakeconnectorassemblycalledthesurgetankstay.Donotforget
it.12mm.
O th bl thi i h t Thi i th i t th
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Onceyouremovetheassemblythisiswhatyousee.Thisistheopeningtotheupper
intakeorsurgetank.No6cethegasket.Alsono6cethesurgetankstaymen6onedon
lastpage.
Anothersurgetankstay
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Backofintakeconnectorassembly
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Frontofintakeconnectorassembly
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Hereiswhatyouul6matelyremovefromtheintakeconnectorassembly
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Undertheupperintakeopeningyoucanfinallyseetherearcoilpacks.
Di 6l 6 h PCV hi h d id f
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Disconnectven6la6onhosetoPCVwhichconnectstoundersideof
upperintake.Youwillaccesstothelesideofintake
Now its 6me to remove the upper intake It is held on from the front side by 4
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Nowit s6metoremovetheupperintake.Itisheldonfromthefrontsideby4
bolts(usesockethexagonwrench8)and2nuts(14mm).Iwillcometothe
rearinasecondwhichhastwoextrabracketscalledsurgetankstays.
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Thereisabracketabovetheintakeboltsthatyouneedtoremove.Thisistheemission
controlvalvebracket.Itis10mmnutsASWELLASthebolts/nutsthatholdtheintake
inplace.Oneofthe10mmontheleincludesagroundingwire
Hereyoucanseeoneoftheboltholesaertheboltwasremoved.Thebolt
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passesthroughthebrackettoholdtheintakeinplace.
Here the bracket is disconnected from the intake It includes several lines that you do
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Herethebracketisdisconnectedfromtheintake.Itincludesseverallinesthatyoudo
notneedtoremove.*****Ihaveanarrowtothelineyouneedtoremoveto
disconnectfromtheintake.*****Ifyoufollowit,itdisconnectsthis
Also
disconnectthisvacuum
lineatthe
top.
A b l h li I 6 d l A I 6 d
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ArrowbelowshowssamelineImen6onedonlastpage.AsImen6oned,
youdonotneedtocompletelyremovethisemissioncontrolvalvebracket
andallofitsstuff.Justrollitforwardontothefrontvalvecover/coilpacks.
Nowyoucanremovetherestoftheupperintakebolts.
***Mostpeoplemissthenexttwoitems**
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Thereisabracket(anothersurgetankstay)
behindtheupperintakeopeningthat
connectstotheintakevia12mmbolt.In
thebo]omphotoyoucanseeitbehindthe
opening.Thisistherightrear(driver)
bracket.Thebracketdoesnotmove.You
removethe12mmboltatthetopofit.I
usedastubbyratchetwrench.Ihopeyou
donthavefatfingers.
Itcanalsobeseenonpage30
Thi i th b lt
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Thisisthebolt.
Now for second rear bolt (le rear passenger side). His is another surge tank
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Nowforsecondrearbolt(lerear passengerside).Hisisanothersurgetank
stay.Behindthelesideoftheintakeyoucanbarelyseetheotherbracket
(arrow).Itisagainstthefirewall.Itisconnectedtointakevia14mmbolt.
d h h ( bb ) b h
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Again,Iusedaratchetwrench(stubby)butthis6meitis14mm.
Again,hardashelltoaccess
Nowyoucanremoveintake.Ilieditoffthelestudfirstthenrotatedclockwiseto
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o you ca e o e a e ed o e e s ud s e o a ed c oc se o
remove.Takeyour6me!!!
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Picunderneathintake(no6cegasket)actuallylooksnew
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Nowwithintakeremoved,hereiswhatyousee.
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Piclookingdownintakerunner.Notinbadshapeatall.
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Noweasyaccesstorearsparkplugs!
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Picofrearleintakebracket(14mm)calledsurgetankstay.
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Picofall3brackets(surgetankstays).2areupperintakeand1isconnectedto
intakeassemblyfromslide29
Pi f ll f th l t i t k b lt (4 f t d 2 ) d t (2 f t)
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Picofalloftherelevantintakebolts(4frontand2rear)andnuts(2front)
RearleO
bracket
14mm
Rearright
Bracket
12mm
FRNTFCAR
Iwentoverboardwithdiscussingtherearintake(surgetankstays)bolts
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becausetheyareapainintheassandbecausemostpeoplemissthem.(pic
lookingfromrearofcar)
h d l d
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IchangedmyPCVsinceIwasalready
there.
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Oldversusnew.WhenyoushakethePCV,itshouldra]le.Myoldonedidbarely.
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Istoppedtakingpicshere.Therestisassembly.AsImen6onedearlier,Ipurchased4
gaskets:theTBgasket,surgetank(upperintake)gasket,intakeconnectorassemblygasket
aswellassurgetankcovergasket(page3).Allofthegasketslookedbrandnewexceptfor
theTBgasket.Ididnotevenaccessthesurgetankcovergasket.Iwouldjustinspectthe
othersifyoudothisprocedureandprobablyonlyneedtochangethemwhenyourcarisabove150kmiles.Ihadallofthegasketssochangedthemall(exceptsurgetankcover
gasket)butinessencetheTBgasketwastheonlyoneneedingtobechanged.
Goodluck.Remembertakeyour6me.Iwouldsuggestdoingthisovertheweekendwhere
Fridaynightyoudisassembleandthenextdayyouswaptheplugs/gasketsandre-assemble.
Hopethishelps!