Somebody tell me what this is please, other then a black box - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevybuldr · 08-07-2011, 10:08 PM

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

cochino12 · 08-07-2011, 10:14 PM

Is that the power window module?

Rogue_Alphonse · 08-07-2011, 10:17 PM

Quote:

Originally Posted by chevybuldr

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

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.

chevybuldr · 08-07-2011, 10:22 PM

Quote:

Originally Posted by Rogue_Alphonse

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.

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.

Rogue_Alphonse · 08-07-2011, 10:24 PM

Quote:

Originally Posted by chevybuldr

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.

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

rwhit57 · 08-07-2011, 10:44 PM

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.

my4by2 · 08-07-2011, 11:47 PM

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.

chevybuldr · 08-07-2011, 11:50 PM

Quote:

Originally Posted by my4by2

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.

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

thirdstreettito · 08-07-2011, 11:58 PM

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

GmtGmt · 08-08-2011, 12:32 AM

thats the computer for the cruise control

chevybuldr · 08-08-2011, 12:34 AM

Quote:

Originally Posted by GmtGmt

thats the computer for the cruise control

Now that sounds like it might be.

MalibuSSwagon · 08-08-2011, 12:56 AM

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.

BLE 'BURBAN · 08-08-2011, 01:31 AM

Quote:

Originally Posted by GmtGmt

thats the computer for the cruise control

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

chevybuldr · 08-08-2011, 01:42 AM

Awsome Thank you guys!!

08-07-2011, 10:08 PM	#1
chevybuldr Registered User Join Date: Oct 2008 Location: Livermore ca Posts: 699	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 Attached Images

08-07-2011, 10:14 PM	#2
cochino12 It followed me home? Join Date: Mar 2003 Location: Yup Posts: 5,751	Re: Somebody tell me what this is please, other then a black box Is that the power window module? __________________ Adam That's why they call it a shortcut Kyle, if it was easy it would just be the way. 86 c-10 SWB 85 CCSB 90 GMC K30 Crew SRW 1985 C30 Dually

08-07-2011, 10:44 PM	#6
rwhit57 Registered User Join Date: Jan 2011 Location: Tulsa,Okla Posts: 590	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.

08-07-2011, 11:47 PM	#7
my4by2 Registered User Join Date: Dec 2010 Location: Hot Springs, AR. Posts: 1,215	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. __________________ 1977 Chevrolet K30 LWB Crew Cab 497HP Mast Motorsports 6.0L LY6 HO engine GM NV4500 5-speed, Centerforce clutch + NP205 D60 + 14-bolt FF w/ Eaton posi + disc brakes Skyjacker 2.5" full spring lift w/ Nitro shocks Custom paint + interior http://67-72chevytrucks.com/vboard/s...d.php?t=435722

08-07-2011, 11:58 PM	#9
thirdstreettito Resident of Here Join Date: May 2008 Location: Wesley Chapel, FL, USA Posts: 7,716	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. __________________ ~Bradley~ 2004 Black GTO LS2/T56 too much to list Miss having a truck

08-08-2011, 12:56 AM	#12
MalibuSSwagon Registered User Join Date: Sep 2009 Location: Weare,NH Posts: 1,592	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. __________________ Eric 1992 Oldsmobile Custom Cruiser 1986 Chevrolet C10\|5.3L\|TKO600\|Shortbed\|Custom Deluxe 1983 Malibu Wagon\|TPI 305\|T5 5 speed\|3.73 non-posi

08-08-2011, 01:42 AM	#14
chevybuldr Registered User Join Date: Oct 2008 Location: Livermore ca Posts: 699	Re: Somebody tell me what this is please, other then a black box Awsome Thank you guys!!



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