87 L98 Vacuum question
Thread Starter
Racer
Joined: Aug 2008
Posts: 302
Likes: 0
From: Lebanon MO
87 L98 Vacuum question
Behind thermostat housing is a EGR vacuum module(?). Has two small lines, 1 going to EGR, 2nd going to frt drivers side somewhere, but there is another larger port on the back side, which I believe should be where the vacuum should be coming from to power up the module (Not electric), but can not find the other hose. Can't find a good diagram (that I can read clearly) anywhere. Any suggestions? The car smokes everytime you hit the accelarator for about 5 minutes, then goes away. Running to rich?? It does lope just a little, but I was told no mods have taken place to the motor. Running rich??
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Should be a plastic hardline that runs to the rear under the plenum as vac source.
Mine's been gone a long time but recall.
From the 2 vac ports , pass side rear of plenum
One goes to fuel reg
The other goes under plenum and splits ;
front to EGR / rear to 1 way valve by dist , then through firewall to A/c.This line also has T to vac ball under drv side head light
Mine's been gone a long time but recall.
From the 2 vac ports , pass side rear of plenum
One goes to fuel reg
The other goes under plenum and splits ;
front to EGR / rear to 1 way valve by dist , then through firewall to A/c.This line also has T to vac ball under drv side head light
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Melting Slicks
Joined: Jul 2003
Posts: 2,384
Likes: 124
From: Reno/Sparks Nevada
The EGR solenoid simply allows vacuum to flow through the valve. The valve connects the two small vacuum lines together. One line goes to the EGR valve, the other to the manifold vacuum. What I believe you are looking at on the back side is the vent. I believe there is supposed to be some kind of filter on there but it could be gone. I'm going from memory. If I find some time I'll look it up.
Art
Art
Team Owner
Joined: Jan 2003
Posts: 20,320
Likes: 248
From: Summerland B.C. Canada
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Thread Starter
Racer
Joined: Aug 2008
Posts: 302
Likes: 0
From: Lebanon MO
Vaccum
The top picture is mine. The "EGR SOL" w/two lines going to it, is what I'm concerned with. A previous post said there is a filter possible that might go there?/?
As to the other question, will seals and guides cause it to smoke at start-up only, or when accelarating also?? Spelling wrong I know:-)
Thanx to everyone for your input also:-)
As to the other question, will seals and guides cause it to smoke at start-up only, or when accelarating also?? Spelling wrong I know:-)
Thanx to everyone for your input also:-)
Team Owner
Joined: Jan 2003
Posts: 20,320
Likes: 248
From: Summerland B.C. Canada
The top picture is mine. The "EGR SOL" w/two lines going to it, is what I'm concerned with. A previous post said there is a filter possible that might go there?/?
As to the other question, will seals and guides cause it to smoke at start-up only, or when accelarating also?? Spelling wrong I know:-)
Thanx to everyone for your input also:-)
As to the other question, will seals and guides cause it to smoke at start-up only, or when accelarating also?? Spelling wrong I know:-)
Thanx to everyone for your input also:-)
