In need of 1985 engine photos - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Nikkortim · 04-16-2007, 08:13 AM

Hey Guys (and gals),

I hope you can help me out. I had a friend rebuild the engine in my '85 Silverado. He didn't think I needed a lot of the emission stuff, and vacuum lines, and took many of those off, and plugged some lines on the Q-Jet.

Without reference I don’t exactly to start. I have the chart under the hood, but that only helps part way.

If any of you could supply me with photos and some indications of what is what in reference to the emission chart I would very grateful.

I tossed around the idea of switching the carb, but I think finding and reinstalling the lines, tees, and valves will be cheaper.

Thanks,
Tim

Slonaker · 04-16-2007, 02:00 PM

Your carb should work fine with everything disconnected, if that is your only worry. Just make sure to cap off all vacuum fittings that are not used.

Slonaker

benoit454 · 04-16-2007, 02:30 PM

I agree our 86 had it all removed and blocked off, you don't need it unless you have to pass emissions inspection.

I know our 84 has everything still on it, and I considered taking it all off, but ir runs fine now so I doubt I will.

AceX · 04-17-2007, 04:19 AM

I want to remove everything so badly... It would clean up the engine bay really well...

Also, get yourself a shop manual. They help, trust me...

Nikkortim · 04-17-2007, 07:24 AM

OK, that helps a lot thanks.

Two other things, the blue wire from the choke goes back to a round housing that has a female AC style connector in side. What activates the electronic choke?

On the top front corner of the carb there are two wires coming out at a 90 degree angle. One is pluged in the other is hanging (I think it is brown). Any clue?

greg0380 · 04-17-2007, 07:59 AM

these pics are of the emissions stickers from my 85 donor. I have some pics of the engine if you still need help. Let me know and I can send them.

Slonaker · 04-17-2007, 10:52 AM

Quote:

Originally Posted by Nikkortim

OK, that helps a lot thanks.

Two other things, the blue wire from the choke goes back to a round housing that has a female AC style connector in side. What activates the electronic choke?

You lost me on the "AC style connector" part... The choke is electric, and activated by an oil pressure switch. On an '85, the switch is mounted on a tee behind the distributor. If not there, I think it will be on the side of the block near the oil filter.

Quote:

On the top front corner of the carb there are two wires coming out at a 90 degree angle. One is pluged in the other is hanging (I think it is brown). Any clue?

That is the dual stage accellerator pump. These are found only on '85-'86 trucks. One wire should go to a temp switch on top of the thermostat housing. I think the other end plugs into the wiring harness that goes above the passenger side valve cover, but I'm not sure. It has been a while since I had that on my truck.

Slonaker

bigbadbowtie · 04-26-2007, 01:13 PM

Quote:

Originally Posted by Slonaker

You lost me on the "AC style connector" part... The choke is electric, and activated by an oil pressure switch. On an '85, the switch is mounted on a tee behind the distributor. If not there, I think it will be on the side of the block near the oil filter.

That is the dual stage accellerator pump. These are found only on '85-'86 trucks. One wire should go to a temp switch on top of the thermostat housing. I think the other end plugs into the wiring harness that goes above the passenger side valve cover, but I'm not sure. It has been a while since I had that on my truck.

Slonaker

Question..... The temp switch you are refering to..... when closed is that switch then tide to ground. Im assuming when the engine gets warm that switch closes causing a short to ground??? Am i correct??

Slonaker · 04-26-2007, 02:02 PM

Quote:

Originally Posted by bigbadbowtie

Question..... The temp switch you are refering to..... when closed is that switch then tide to ground. Im assuming when the engine gets warm that switch closes causing a short to ground??? Am i correct??

It has just one wire going to it, so I assume it just grounds it to the block. I don't know the details. I mostly just wanted it gone.

Slonaker

Nikkortim · 04-17-2007, 12:01 PM

Aahhhh that explains a lot. The oil and water senders have been replace by Dakota Digital senders in preperation for a dash install.

wedgemon · 04-17-2007, 12:45 PM

Here's all you really need...
(I plagiarized this drawing and edited all I didn't need.)

Pyrotechnic · 04-17-2007, 10:46 PM

+1 weddgemon

The stock diagram looks like a nightmare. No way I would reconnect all that.

Nikkortim · 04-25-2007, 08:07 AM

Thanks for your help guys, espcially Wedgemon. That I can do, and it should take care of a couple of issues.

BTW my friend failed to hook up power to my choke so that "was" a minor problem. As it sits now it runs ok but the Q-Jet needs a bit of tweaking.

Thanks again.

04-16-2007, 08:13 AM	#1
Nikkortim Registered User Join Date: Dec 2006 Location: South Dakota Posts: 7	In need of 1985 engine photos Hey Guys (and gals), I hope you can help me out. I had a friend rebuild the engine in my '85 Silverado. He didn't think I needed a lot of the emission stuff, and vacuum lines, and took many of those off, and plugged some lines on the Q-Jet. Without reference I don’t exactly to start. I have the chart under the hood, but that only helps part way. If any of you could supply me with photos and some indications of what is what in reference to the emission chart I would very grateful. I tossed around the idea of switching the carb, but I think finding and reinstalling the lines, tees, and valves will be cheaper. Thanks, Tim

04-16-2007, 02:00 PM	#2
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: In need of 1985 engine photos Your carb should work fine with everything disconnected, if that is your only worry. Just make sure to cap off all vacuum fittings that are not used. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado

04-16-2007, 02:30 PM	#3
benoit454 Chris Join Date: Nov 2004 Location: Monaville, WV Posts: 3,737	Re: In need of 1985 engine photos I agree our 86 had it all removed and blocked off, you don't need it unless you have to pass emissions inspection. I know our 84 has everything still on it, and I considered taking it all off, but ir runs fine now so I doubt I will. __________________ Chris GIT R DONE!!!!!! Check out all our rides, http://www.cardomain.com/id/benwa454

04-17-2007, 04:19 AM	#4
AceX >130dB Moderator Join Date: Aug 2006 Location: Sacramento, CA Posts: 2,130	Re: In need of 1985 engine photos I want to remove everything so badly... It would clean up the engine bay really well... Also, get yourself a shop manual. They help, trust me...

04-17-2007, 07:24 AM	#5
Nikkortim Registered User Join Date: Dec 2006 Location: South Dakota Posts: 7	Re: In need of 1985 engine photos OK, that helps a lot thanks. Two other things, the blue wire from the choke goes back to a round housing that has a female AC style connector in side. What activates the electronic choke? On the top front corner of the carb there are two wires coming out at a 90 degree angle. One is pluged in the other is hanging (I think it is brown). Any clue?

04-17-2007, 07:59 AM	#6
greg0380 Registered User Join Date: Dec 2003 Location: CT Posts: 454	Re: In need of 1985 engine photos these pics are of the emissions stickers from my 85 donor. I have some pics of the engine if you still need help. Let me know and I can send them. Attached Images __________________ 1985 GMC Sierra 1500, 1/2 ton, 2WD, LWB, TBI 305 5 speed, 3.42 rear 2007 GMC Sierra 1500, xtended cab, 4X4, flexfuel 5.3L 1999 BMW 528i

04-17-2007, 12:01 PM	#10
Nikkortim Registered User Join Date: Dec 2006 Location: South Dakota Posts: 7	Re: In need of 1985 engine photos Aahhhh that explains a lot. The oil and water senders have been replace by Dakota Digital senders in preperation for a dash install.

04-17-2007, 12:45 PM	#11
wedgemon Registered User Join Date: Jul 2004 Location: Spanish Springs, NV Posts: 1,171	Re: In need of 1985 engine photos Here's all you really need... (I plagiarized this drawing and edited all I didn't need.) Attached Images __________________ 2003 Silverado K1500 Z71 - Arrival Blue 1973 K5 Cheyenne Blazer 350/TH350/NP203 Kids Trucks:92 K1500 Blazer 5.7/700R4 4" lift. RETIRED: 1980 Scottsdale 4x4 Founding Member: "TILT WHEEL BELLY." Club

04-17-2007, 10:46 PM	#12
Pyrotechnic Registered User Join Date: Feb 2007 Location: Austin, TX Posts: 3,930	Re: In need of 1985 engine photos +1 weddgemon The stock diagram looks like a nightmare. No way I would reconnect all that.

04-25-2007, 08:07 AM	#13
Nikkortim Registered User Join Date: Dec 2006 Location: South Dakota Posts: 7	Re: In need of 1985 engine photos Thanks for your help guys, espcially Wedgemon. That I can do, and it should take care of a couple of issues. BTW my friend failed to hook up power to my choke so that "was" a minor problem. As it sits now it runs ok but the Q-Jet needs a bit of tweaking. Thanks again.



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