Need help identified this

Sultan
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Need help identified this

Postby Sultan » Mon May 21, 2018 9:28 am

Hello all,
Could someone please help me identifying what this tube is for on the 20v manifold, its not connected to anything and when I block it nothing seems to happen to the engine, is it suppose to connect to somewhere?

https://ibb.co/hCo6Lo

Regards

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jondee86
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Re: Need help identified this

Postby jondee86 » Mon May 21, 2018 11:33 pm

According to the information in this thread...
http://www.side2sideracing.com/installs ... 0v-vac-bt/
... that thing is a "check valve" or one-way valve used in the vacuum line to the
throttle opener.

Image

Assuming that you have it disconnected from its vacuum source, nothing will be
going into or coming out of that hose, and the throttle opener will be fully extended.
There will also be a small vacuum spigot somewhere nearby that does not have a
hose connected to it, and is presently leaking air into your manifold and raising
the idle slightly.

If you have deleted the throttle opener. then you don't need that hose. Just make
sure that the vacuum source is capped off. I don't really understand why there has
to be a chack valve in the throttle opener hose. You can take the thing out and try
blowing thru it in both directions. One way should easy and the other way should be
hard/impossible. If you can blow thru it fairly easily in both directions, then it might
be a pulsation damper.

Cheers... jondee86
Give a person a fish, they eat for a day. Suggest they search before posting, and they learn a skill for a lifetime.

Sultan
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Location: California

Re: Need help identified this

Postby Sultan » Mon Jun 04, 2018 3:42 am

Thanks mr jondee86

Does this have anything to do with the ac system idle up, because whenever I turn on the ac on a hot day the idle seems to get really low around 600rpms and the car will vibrate, but this only happens sometimes other times idle is steady at around 900-1000rpms
Regards and thanks for your help

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jondee86
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Re: Need help identified this

Postby jondee86 » Mon Jun 04, 2018 3:14 pm

The vacuum lines under the throttles do not have any connection with the A/C.

I am reasonably certain (but open to correction) that the AE111 does not have
a separate A/C idle-up valve. The ECU monitors the idle speed and uses the ISCV
to compensate for the extra load when the A/C turns ON. If this is the case, then
perhaps the ISCV is sticking and needs a clean ?

If you haven't cleaned the ISCV there is some talk about how to do it and how to
check that the valve is turning freely in this thread... viewtopic.php?t=20775

Cheers... jondee86

PS: I have assumed that you have an AE111 (blacktop) 20V engine. If you have
an AE101 (silvertop) engine there may well be is separate A/C idle-up solenoid.
This information is hard to come by and I don't have any 20V cars to play with :)
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Sultan
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Location: California

Re: Need help identified this

Postby Sultan » Mon Jun 04, 2018 10:17 pm

Thanks again Mr Jondee,

Yes got the blacktop I'll clean the iscv and see what happens,thats for linking me to that thread:)
Regards

Sultan
Club4AG Regular
Posts: 15
Joined: Sun Nov 22, 2015 9:57 pm
Location: California

Re: Need help identified this

Postby Sultan » Thu Jun 14, 2018 1:51 pm

I was just wondering where is the iscv exactly, im going to attempt to do this myself but I have no mechanical skills, Do I need to remove the complete manifold to access wherever it is? the engine is the 20v bt

Thanks

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jondee86
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Re: Need help identified this

Postby jondee86 » Thu Jun 14, 2018 3:08 pm

The ISCV is bolted underneath the intake manifold at the rear of the engine. This
might be helpful.... http://files.aeu86.org/manuals/blacktop/bt8-fi.pdf

In a FWD installation you don't have much choice... you have to remove the whole
intake manifold/throttle assembly to get access to the ISCV. But in a RWD installation
you should have better access, and it might just be possible to get the valve out
without tearing everything else off first.

Image

There are two rubber hoses that connect to the valve in the factory arrangement, and
one electrical clip that you can see marked in yellow in the pic. You can also see the
two bolts that attach the ISCV to the head. If you can get them undone you should be
able to slide the valve out... maybe :) You will have to make your own call on that.

Cheers... jondee86
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