Glenncal1

Hey all-Picked up a used/tested ISV for my 1985. How long a job to change out? How difficult to remove the intake runners to get at the valve. Thanks Jim.

sharkmeister85

Can be done with out removing the intake.
Glenn

Glenncal1

Glenn-how do you get at it then? Thanks

sharkmeister85

Glenn,
My recollection is that if you take off the air filter and its box and the MAF, you will be able to access it from the passenger side rear of the valley. There's not lots of room to work on it, but it can be done. Check that the hoses that attach to it are in good condition WYAIT. Just the 2 hoses,an electrical connection and a fastener to do if memory serves correct. Shouldn't take very long, barring unforseen problems.
Glenn

SteveG

I don't think so. One of the hoses from it goes to the throttle body; I suppose you could leave the hose attached at the throttle but there is no way to reach that clamp. You ought replace those hoses anyway. In order to get at the intake, the fuel rail has come off, that means careful prying and cursing to get the 4 injectors out. It's at least 4 hours, more like 8 for me. YMMV.

Glenncal1

Darn-I just had the aircleaner off to change the heater valve, but that is not a big deal.

sharkmeister85

Ok, just to be more clear, the ISV can be changed without removing the manifold. I said "Check that the hoses that attach to it are in good condition". If they are fine, no problem. If the hose that goes to the throttle body needs replacement, as SteveG said things get a bit more complicated.
Glenn

Glenncal1

Do you know what part of the repair manual would show this area?

dprantl

That's not true. You can change the valve and both hoses without removing the intake on a US '85-'86. You need to remove the two air distribution boxes on each side, and then remove the middle equalizing pipe that connects to the two boxes and to the throttle body. The fit for the middle pipe is tight, but it will come out at the right orientation. Once you do this (and the air box and MAF of course), you will have enough room to remove almost everything under the intake with some clever uses of extensions and swivel sockets.

Dan
'86 928S 5-spd w/LSD

SteveG

That's good news. I don't remember how to get to the t-pipe, but I'm glad to know that.

jeff jackson

You know what ?? Pulling the 85-86 intake is no big deal either, and then, you can see and assess the condition of all hoses and clamps in there instead of playing "peek-a-boo" and hoping for the best. In my experience, the intake runner tube gaskets stay attached to the tubes, and do not require replacement, and the whole job is made simpler by having them out of the way, and you have access to the "notoriously cracked" 7 way vacuum fitting at the rear of the intake...and can paint or powder coat the intake plenums and runners while they are off etc.etc....in other words, its easy to pull the intake plenums and port runners, and check closely all the rubber couplers between the side plenums and the port runners, and the large couplers to the throttle body. These are prone to cracking with age, and lead to hard to diagnose vacuum leaks. and all the under the intake hoses should be carefully inspected and replaced if necessary...This way you do this job once, do it right, and don't have to get back in there anytime soon...unless you find out you have a screwdriver or wrench or something missing...after you have it buttoned back up.