spark plug removal??

suprakillz · 12-10-2009, 02:19 AM

i looked all over the internet and on all the threads here. does any one know how to change the spark plugs on an 89 supra non turbo? i can get to most of them, but the intake manifold gets in the way for one, and a little bit on another. i don't want to remove the intake unless i have to. can any one help and maybe show some pics of how to change them??

cre · 12-10-2009, 02:35 AM

Sorry, no magic way to do it.

There are 4 bolts to the throttle body. You have to unbolt them and the two braces on the passenger which connect it to the head. Then pop the throttle linkage off with a screwdriver. There are only two hoses you need to disconnect: the one which connects the metal T shaped pipe on the back side and the 1" hose on the front side. Then just lift the throttle body out of the way. Don't disconnect the two 1/2" hoses if you can avoid it, they're coolant hoses.... not hard to work with, but I don't believe you have to to get the job done.

Don't over tighten anything when reassembling and absolutely do not over tighten the spark plugs!

While you've got the throttle body off grab a philips screwdriver and tighten down the screws holding down the valve covers... it's a common spot for leaks. (You should change the gaskets for new ones if you're up to it.) They only need to be a good, firm hand tight.

The screws for the throttle body (all 6, the 2 for the 2 braces and the 4 which connect it to the rest of the intake) require just 9ft.lbs. The spark plugs require 13ft.lbs.

Here's the Toyota service manual's section on it:
http://www.cygnusx1.net/Supra/Librar....aspx?S=IG&P=6

suprakillz · 12-10-2009, 03:07 AM

thanks.. this will really help out. i bought my spark plugs almost a month ago, and they are still sitting in my house.

cre · 12-10-2009, 05:41 AM

I only mention this as you seem to be new to the game... make sure you got the right plugs for your engine. The 7M-GE and GTE both require different specs.

suprakillz · 12-11-2009, 09:09 PM

i got some ngk spark plugs. i have worked on cars before, but this is my first supra. i didn't know if there was a short cut to changing the spark plugs, so i just figured i would ask.

cre · 12-11-2009, 09:21 PM

Nope, no short cut... it's cake though and only takes an extra two minutes after you've done it once or twice.

batmmannn · 05-09-2010, 11:18 PM

What wrench do I use my standard Plug socket does not fit. I tried an 18MM deep and it didn't work either.

907mge · 05-09-2010, 11:50 PM

Use a 5/8 spark plug socket. And also if you disconnect the y pipe from the main section of the intake manifold you can do the spark plugs and valve cover gaskets as well as reseal the oil plugs. Just make sure you replace the old gaskets with new so there are no leaks. Don’t try reusing, it doesn’t work as I found out. Felpro makes an intake manifold gasket set that is very common and only costs about $10.

batmmannn · 05-15-2010, 06:09 PM

I am trying to get that off as well. I got the 4 bolts and the two on the bracket but don't you have to unbolt it from the manifold? What about the bottom bolts that attach it to the manifold how do you reach those? and those two electrical devices on it. One has phillips screws attaching it to the plenum and has an electrical wire on it the other is back to the drivers side but front of the plenum. Don't all these have to be taken off to get the valve covers off? How do I get to those bottom bolts and what is the best way to disconnect those electrical components. They don't appear to be connectors and I don't want to break the black plastic sheathing thinking that they are trying to get them off. Thanks so much for your time

907mge · 05-15-2010, 10:47 PM

Use a 1/4 in. drive universal and 6 in. extension to get the two bottom bolts. And as far as the connectors go they should come apart with a little gentle working, the key is to be gentle.

12-10-2009, 02:19 AM	#1
suprakillz Stock Join Date: Nov 2009 Location: kc Posts: 26	spark plug removal?? i looked all over the internet and on all the threads here. does any one know how to change the spark plugs on an 89 supra non turbo? i can get to most of them, but the intake manifold gets in the way for one, and a little bit on another. i don't want to remove the intake unless i have to. can any one help and maybe show some pics of how to change them??

12-10-2009, 03:07 AM	#3
suprakillz Stock Join Date: Nov 2009 Location: kc Posts: 26	thanks.. this will really help out. i bought my spark plugs almost a month ago, and they are still sitting in my house. Last edited by suprakillz; 12-10-2009 at 03:30 AM. Reason: not spelled right

05-09-2010, 11:18 PM	#7
batmmannn 12psi boost Join Date: May 2010 Location: West Virginia Posts: 320	Spark Plug wrench What wrench do I use my standard Plug socket does not fit. I tried an 18MM deep and it didn't work either.

05-15-2010, 06:09 PM	#9
batmmannn 12psi boost Join Date: May 2010 Location: West Virginia Posts: 320	Plenum removal I am trying to get that off as well. I got the 4 bolts and the two on the bracket but don't you have to unbolt it from the manifold? What about the bottom bolts that attach it to the manifold how do you reach those? and those two electrical devices on it. One has phillips screws attaching it to the plenum and has an electrical wire on it the other is back to the drivers side but front of the plenum. Don't all these have to be taken off to get the valve covers off? How do I get to those bottom bolts and what is the best way to disconnect those electrical components. They don't appear to be connectors and I don't want to break the black plastic sheathing thinking that they are trying to get them off. Thanks so much for your time __________________ 1987 N/A 7MGE Left Hand Drive MK3 Red 5 Speed and Black Auto Supras My Next project is the Batmobile! Last edited by batmmannn; 05-15-2010 at 06:12 PM.

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12-10-2009, 02:35 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Sorry, no magic way to do it. There are 4 bolts to the throttle body. You have to unbolt them and the two braces on the passenger which connect it to the head. Then pop the throttle linkage off with a screwdriver. There are only two hoses you need to disconnect: the one which connects the metal T shaped pipe on the back side and the 1" hose on the front side. Then just lift the throttle body out of the way. Don't disconnect the two 1/2" hoses if you can avoid it, they're coolant hoses.... not hard to work with, but I don't believe you have to to get the job done. Don't over tighten anything when reassembling and absolutely do not over tighten the spark plugs! While you've got the throttle body off grab a philips screwdriver and tighten down the screws holding down the valve covers... it's a common spot for leaks. (You should change the gaskets for new ones if you're up to it.) They only need to be a good, firm hand tight. The screws for the throttle body (all 6, the 2 for the 2 braces and the 4 which connect it to the rest of the intake) require just 9ft.lbs. The spark plugs require 13ft.lbs. Here's the Toyota service manual's section on it: http://www.cygnusx1.net/Supra/Librar....aspx?S=IG&P=6

12-10-2009, 05:41 AM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I only mention this as you seem to be new to the game... make sure you got the right plugs for your engine. The 7M-GE and GTE both require different specs.

12-11-2009, 09:09 PM	#5
suprakillz Stock Join Date: Nov 2009 Location: kc Posts: 26	i got some ngk spark plugs. i have worked on cars before, but this is my first supra. i didn't know if there was a short cut to changing the spark plugs, so i just figured i would ask.

12-11-2009, 09:21 PM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Nope, no short cut... it's cake though and only takes an extra two minutes after you've done it once or twice.

05-09-2010, 11:50 PM	#8
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	Use a 5/8 spark plug socket. And also if you disconnect the y pipe from the main section of the intake manifold you can do the spark plugs and valve cover gaskets as well as reseal the oil plugs. Just make sure you replace the old gaskets with new so there are no leaks. Don’t try reusing, it doesn’t work as I found out. Felpro makes an intake manifold gasket set that is very common and only costs about $10.

05-15-2010, 10:47 PM	#10
907mge 20psi boost Join Date: Dec 2009 Location: Harrisburg Posts: 759	Use a 1/4 in. drive universal and 6 in. extension to get the two bottom bolts. And as far as the connectors go they should come apart with a little gentle working, the key is to be gentle.