ehall

Did you unplug the TPS at some point and forget to plug it back in?

Paulyy

6:30 in the morning, problem solved, throttle cable held the TPS open. thanks anyway fellas

ehall

Thought so. Glad it's fixed.

Paulyy

Just wondering, what is this blue and black thing, and does it just float around like that or it actually connects to something?

azbanks

I can't tell you what it is but yes, it does not really connect to anything. Mine is part a a bundle of wires/vacuum lines zip tied too the firewall.

RENEE_J

The blue and black thing is a Vacuum Check Valve (928-537-361-02) connected in line from the brake booster, supplying vacuum to the recirculating air valve (climate controls), vacuum reservoir and heater valve.

Paulyy

where are they located?
so in other words, it's not supose to be left laying there?

86 951 Driver

I know this shows you how to not use a kit, but should these hoses be replaced since they are so old and rubber?

Paulyy

i replaced mine and used their diagram for a mbc with a dual port wg.
only replaced them because because my lines kept popping off on boost.

but the check valve just hanging there dosnt seem right. the car drives fine and idles good, nice and stable.

86 951 Driver

I am going to do this and hopefully it will fix my boost problem.

black944 turbo

Pauly, it is supposed to b ziptied on the fire wall with a bundle of the harness and some other vacume lines as others have said.

ehall

Generally yes.

Paulyy

It's just so odd, but thanks for the info, i had to double check that.

txhokie4life

Old thread -- but I'm hoping this is still appropriate question.

Can you remove the ICV all together.

I'm doing a minimalist vacuum setup for my 90% track car (although it needs
to drive to/from the track).

For the moment I pulled the ICV and placed a 1/2" plastic pipe between
the two LR silicon lines.

Here is the picture just prior to me pulling the ICV. I was wondering on direction
and thought -- why do I have it in there at all :-)

thx,

Mike

andycowman

I cant tell you the impact on your set up but i am running an emerald ECU and currently have the ISV still in place but the ECU is ignoring it and controlling idle using ignition timing alterations. It idles perfectly well like this - I am also tempted to remove the ISV from the car as part of tidying up the vac lines.