91 MK3 won't idle properly due too vacuum, am new too this!

Silver_bullet_1992 · 10-27-2011, 08:52 PM

Hi guys, just bought my new toy.
It had a blown head gasket so I've repaired it.. (ARP studs and all the gear)
On hooking the vacuum lines up, which where previously disconnected I tried too follow all the diagrams but my car has a few differences, it only has one VSV instead of 2 on the intake side of the car, and also 1 throttle body outlet.
Any help would be greatly appreciated, cheers..

cre · 10-28-2011, 03:05 AM

I'm assuming this is a GTE and not a GE and also that it's not equipped with EGR? You'd need to follow the vacuum diagram from your region or a Japanese MKIII to put everything 100% straight. I'm not sure if they're available online; The only online versions I know of are for the North American model. You shouldn't have any of the EGR plumbing and two ports on top of the throttle body (the rear most two) will not be present from what I recall.

Silver_bullet_1992 · 10-28-2011, 02:22 PM

It is GTE and no egr, not required in aus.
I've tried everywhere for vacuum diagrams, including on the bonnet.
They all say I should have 2 vsvs and 2 throttle body connections??

cre · 10-28-2011, 02:49 PM

It would help if you could post a couple pictures showing where they are in the engine bay, the nipples on the throttle body and a picture of the bonnet diagram. The bonnet decal should also state what engine and market it's for.

Which model engine is it? 7M, 1JZ, 2JZ, IG?

Silver_bullet_1992 · 10-28-2011, 02:57 PM

It's 7M.
The second vsv isn't required if since come too learn, as it's for the egr.
The car idles up and down like a yoyo, and when you accelerate sharply it hesitates..? If that's any help??
I can't post pictures ATM, will try too asap.
The connector for the throttle body Is directly ontop, and points too the passenger seat

cre · 10-28-2011, 03:40 PM

I'm going to need a few pictures. I'm assuming it's Right Hand Drive and things are laid out differently than our LHD Supras.

If you cap the vacuum port does the idle still wander? Have you checked for error/diagnostic codes (see the MKIII FAQ section for a thread on how to do it)?

10-27-2011, 08:52 PM	#1
Silver_bullet_1992 Stock Join Date: Oct 2011 Location: South Australia, Australia Posts: 3	91 MK3 won't idle properly due too vacuum, am new too this! Hi guys, just bought my new toy. It had a blown head gasket so I've repaired it.. (ARP studs and all the gear) On hooking the vacuum lines up, which where previously disconnected I tried too follow all the diagrams but my car has a few differences, it only has one VSV instead of 2 on the intake side of the car, and also 1 throttle body outlet. Any help would be greatly appreciated, cheers..

10-28-2011, 03:05 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I'm assuming this is a GTE and not a GE and also that it's not equipped with EGR? You'd need to follow the vacuum diagram from your region or a Japanese MKIII to put everything 100% straight. I'm not sure if they're available online; The only online versions I know of are for the North American model. You shouldn't have any of the EGR plumbing and two ports on top of the throttle body (the rear most two) will not be present from what I recall. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

10-28-2011, 02:49 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	It would help if you could post a couple pictures showing where they are in the engine bay, the nipples on the throttle body and a picture of the bonnet diagram. The bonnet decal should also state what engine and market it's for. Which model engine is it? 7M, 1JZ, 2JZ, IG? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

10-28-2011, 03:40 PM	#6
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I'm going to need a few pictures. I'm assuming it's Right Hand Drive and things are laid out differently than our LHD Supras. If you cap the vacuum port does the idle still wander? Have you checked for error/diagnostic codes (see the MKIII FAQ section for a thread on how to do it)? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

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10-28-2011, 02:22 PM	#3
Silver_bullet_1992 Stock Join Date: Oct 2011 Location: South Australia, Australia Posts: 3	It is GTE and no egr, not required in aus. I've tried everywhere for vacuum diagrams, including on the bonnet. They all say I should have 2 vsvs and 2 throttle body connections??

10-28-2011, 02:57 PM	#5
Silver_bullet_1992 Stock Join Date: Oct 2011 Location: South Australia, Australia Posts: 3	It's 7M. The second vsv isn't required if since come too learn, as it's for the egr. The car idles up and down like a yoyo, and when you accelerate sharply it hesitates..? If that's any help?? I can't post pictures ATM, will try too asap. The connector for the throttle body Is directly ontop, and points too the passenger seat