Vacuum line?
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Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
Vacuum line?
Put a motor in the 89 finally, (bought it cheap with engine compartment fire damage) and have it running great now. It has one small issue left and I'd thought it be easier to ask you guys about it first before tearing into the dash.
There is a large vacuum line running from the intake, goes through the firewall right next to the passing gear cable. I followed it, or rather tried to follow it and I see it disappears out of sight heading toward the drivers side up over the steering column.
Where and what the heck does it connect to up there, when the brake pedal is pushed you can hear a big vacuum leak.
There is a large vacuum line running from the intake, goes through the firewall right next to the passing gear cable. I followed it, or rather tried to follow it and I see it disappears out of sight heading toward the drivers side up over the steering column.
Where and what the heck does it connect to up there, when the brake pedal is pushed you can hear a big vacuum leak.
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Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
No the hose goes through the firewall, I figure it opens and closes the dampers in the air ducts and such but why it goes up on the top of the steering column is what kinda throws me.
That and why it would suck air when the brake pedal is pushed. Can't think of anything up there it would operate unless its cruse control related up there.
The brake booster vacuum line is there and working. At first I thought the fire melted something in the booster, swapped the booster off a parts car and it does the same thing. Disconnect the line going through the firewall and it doesn't do it, no vacuum leak when the pedal is pushed. Whatever it is is a pretty good sized leak, loud and makes the motor idle up considerably to make up for it.
That and why it would suck air when the brake pedal is pushed. Can't think of anything up there it would operate unless its cruse control related up there.
The brake booster vacuum line is there and working. At first I thought the fire melted something in the booster, swapped the booster off a parts car and it does the same thing. Disconnect the line going through the firewall and it doesn't do it, no vacuum leak when the pedal is pushed. Whatever it is is a pretty good sized leak, loud and makes the motor idle up considerably to make up for it.
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Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
The fire was on the other side of the motor, didn't burn anything on the inside of the car. Just wiring and plastic stuff under the hood, power distribution box. Plastic wheel tub, breather box and hoses, blower housing. Almost all the wiring was toasted under the hood.
Ordered a hood and fender for it, only body parts effected and even at that they're not to bad. But want it to look nice like the rest of it.
I had all the parts to fix it, just needed the under hood harness from a bone yard donor (35 bucks). 88 to 89 are different so I couldn't use what I had for that part.
Well that and the fender and hood, obviously them are different too!
Every thing else fit right on it.
Ordered a hood and fender for it, only body parts effected and even at that they're not to bad. But want it to look nice like the rest of it.
I had all the parts to fix it, just needed the under hood harness from a bone yard donor (35 bucks). 88 to 89 are different so I couldn't use what I had for that part.
Well that and the fender and hood, obviously them are different too!
Every thing else fit right on it.
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Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
<i>Sounds like the cruise control vacuum dump - releases the cruise control when you step on the brake.</i>
Ok great, now where is it? Drop the column down to get to it?
And is the valve the same on a 88 model?
Ok great, now where is it? Drop the column down to get to it?
And is the valve the same on a 88 model?
Senior User
Joined: May 2007
Posts: 349
Likes: 1
From: Helena,MT
vacuum dump valve is below the steering column - contacts the brake pedal arm - should be near the stop light switch - vacuum hose plugs onto the end of it.
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Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
Ok I'll check it out, must be just the way they ran the hose, up over the top of everything. Its way up there, right up to the bottom of the dash pad.
Must come back down the other side, once I seen it disappear over the top I quit looking. Wasn't a big deal at the time, you know how it is. At the time we where working toward that all important first road test, before going any further with the "little" stuff.
Must come back down the other side, once I seen it disappear over the top I quit looking. Wasn't a big deal at the time, you know how it is. At the time we where working toward that all important first road test, before going any further with the "little" stuff.
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