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Discussion Starter #1
Hi Guys, so I am asking another question and hoping to not get burnt to a crisp. The reason I am asking is, in my other thread a question was asked about a 2nd connector down near the VSV for FPU. My answer was that it must be the connector for the VSV for egr. Now, I was taking a very close look at my car to compare with the diagrams. The diagrams show 2 vsv's, 1 for the fpu, and the other for the egr. So here's my problem. I do not have a second vsv. I searched every where in that area for another vsv, under alternator, back on firewall, under intake plenum. I used flashlight and a mirror to see under everything I could. There is no 2nd vsv there, and there is no 2nd connector, or capped off vac lines. The way my system is plumbed is as follows.
Vac line on Fuel Presure Reg goes to metal pipe, pipe goes to rubber hose , hose goes to output nipple on vsv for fpu, input nipple on vsv for fpu has hose attached, hose goes to pipe, pipe goes to rubber hose, hose goes to nipple on egr modulator, other nipple on egr modulator has hose attached to it, that hose goes down to egr valve. No other vac lines that I can see on that system.
There is 1 connector that goes from harness to vsv for fpu.
Is this the way this car is supposed to be plumbed, it doesn't match the online service manual, but that is not for an 87, don't know if there is a difference between years.
And where is the vsv for fpu getting it's vacuum, if it is going to the egr modulator, and that ends in the egr valve. Does the egr valve supply the vacuum?
Really appreciate anyone that can explain why my car doesn't match the diagrams, and how the egr system can work right with this setup.
Semper FI
 

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Discussion Starter #3 (Edited)
Egr vac routing doesn't seem right

Hi, thanks for posting the diagram. That is the diagram I am referring to. On my car, there is No 25860 VSV. The vac hose #99909-92002 travels directly from the egr modulator through the rubber hose and pipe to the inlet nipple,(the nipple next to the filter),on the #17650 VSV for FPU. The 25860 is not there, there is no electrical connector there and no extra vac lines. Just the 1 VSV for FPU. Does anybody else have an unmodified car that is set up this way. It seems that this setup is feeding the vacuum to the VSV for FPU from the egr modulator. Does that seem like it would work properly.
Thanks for any input. Semper Fi.
 

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Discussion Starter #4
Hi Guys, I have finally fiqured out the vac routing on my car. It is essentially the same as the diagram, just not exactly. I mistook the egr vsv for the fpu vsv. The Fpu vsv is under the alternator, near block, by runner 1 of the intake manifold. I couldn't see the fpu vsv from any angle, finally got a small mirror in there and that cleared up the mystery for me. So basically the egr and the fpu do not share a vsv, but do share the same vac pipe.
Thanks for all your help.--Semper Fi.
 
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