What is this?
Thread Starter
Instructor
Joined: Dec 2005
Posts: 100
Likes: 0
From: Pleasanton California
What is this?
I have seen this a couple times before, and I'm not very mechanically inclined. It is right behind the driver seat underneath a layer of insulation under the storage box.
Le Mans Master
Joined: Feb 1999
Posts: 6,470
Likes: 2
From: levittown pa. usa Even a bad day with my `Vette, is better than a good day at work
St. Jude Donor '10
Originally Posted by 86PACER
That is your ABS Modulator Valve (pump) and the ABS Control Module (computer). If your ABS works, that is where that spinning sound comes form when you start the car and reach 4MPH.
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
Originally Posted by kenv
On my `87, it only makes a little noise when I put it in reverse for the first time in the morning. No noise at all, the rest of the day.
Race Director
Joined: Aug 2003
Posts: 13,421
Likes: 8
From: Lake Mary Florida
Originally Posted by 86PACER
Interesting. Shop manual says it should do it every time the car is shut off and 4 MPH is reached again, as it's a "check" the ABS system runs on itself each time. My 86 does.
yep the noise you hear is the valve cycling. All the senors are checked and the valve cycled. 
Burning Brakes
Joined: Sep 2005
Posts: 826
Likes: 0
From: Millbury MA
Originally Posted by 86PACER
That is your ABS Modulator Valve (pump) and the ABS Control Module (computer). If your ABS works, that is where that spinning sound comes form when you start the car and reach 4MPH.
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Race Director
Joined: Dec 2005
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From: Professional just means you get paid
Originally Posted by Ericsvette
I'm talking about the rearend on the car of course.
I assumed it was the ABS. Mine, too, does it first thing when I back out of the driveway. I''l listen closer at 4mph.