Somebody tell me what this is please, other then a black box
 

Whats this for? Is it the same for big block and small block? It was under the dash of both an '86 and '88 suburban I parted.

Thanks in advance

Re: Somebody tell me what this is please, other then a black box
 

Is that the power window module?

Re: Somebody tell me what this is please, other then a black box
 

I think it's the ...ECU? or whatever they called it for the electronically-controlled Quadrajets they had in 1985 and '86. My '86 C-10 had one that looked damn similar, but it was in yellow plastic rather than white and not on a big bracket like that. It was mounted on the passenger side where GM later mounted the TBI ECU's.

Re: Somebody tell me what this is please, other then a black box
 

No this is up near the ash tray area I think it was or the break pedel. The ECU is still in the '88 for the TBI.

Re: Somebody tell me what this is please, other then a black box
 

I never really dug into that part of the dash enough to find anything like that... got me stumped!:lol:

Re: Somebody tell me what this is please, other then a black box
 

Could it be for trailer brakes? I know a lot of Suburbans had tow packages. I have parted out a number of pickups and I never remember seeing one of those.

My other guess would be something to do with the factory radio.

Re: Somebody tell me what this is please, other then a black box
 

I believe that is the knock retard ECU for the distributor - should have a knock sensor in the block that runs to it. They used this to retard the timing automatically when it sensed any engine knock.

Re: Somebody tell me what this is please, other then a black box
 

But on an '88 with TBI wouldnt that be in the ECU?

Re: Somebody tell me what this is please, other then a black box
 

I think it's a trailer brake controller, a very basic one.

Re: Somebody tell me what this is please, other then a black box
 

thats the computer for the cruise control

Re: Somebody tell me what this is please, other then a black box
 

Now that sounds like it might be.

Re: Somebody tell me what this is please, other then a black box
 

The knock retard ECU for 85-86 CCC systems is mounted in the same location as the F/I ECU for 88-91 trucks, behind the glove box in a white tray. So thats not it.

Re: Somebody tell me what this is please, other then a black box
 

That's exactly what that is. it mounts to the right of the steering column support just above the brake pedal. Item # 11 & 12 in the diagram

Re: Somebody tell me what this is please, other then a black box
 

Awsome Thank you guys!!