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86 1500 Emission Removal. Start The Debate!

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pontiacratrod

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I Am Planning On Tearing Off The Emissions Crap On My 2wd 1986 Gmc 1500 Burban This Weekend, And Wanted To Make Damn Sure That I Got All The Bases Covered To Prevent Something Not Working Out. First Off, They Did Away With The Testing Of Pre 95 Vehicles In My Area Plus Im Running Cats Still So If They Did Bring It Back I Would Be Fine With A Properly Tuned Carb.

Now... The Carb Is Junk. Ive Got A Late 70's Quadrajet And Hei Vacuum Advance Distributor Layin Around, So I Thought I Would Swap Em Out. Of The Few Things I Was Thinking Might Be A Problem Is The Transmission. It Is A 700 Overdrive Unit. Im Pretty Sure If A Leave Well Enough Alone And Dont Start Yanking Wires From It I Will Be Okay, Cause Alot Of People Have Told Me That The Pre 87 Trucks Come With A Solenoid Operated Lock Up.

So As Long As I Make Sure The Tv Cable Is Properly Set Up And I Make Sure I Block All Of The Open Lines In The Vacuum Circuit I Should Be Rockin And Rollin Right?

Any And All Feedback From Anyone Who Have Done This Please Shout At Me.
Thanks...
Bob
 
If your 700 doesn't have vacuum controls then it won't have any ports to plug. Even so, if it does need vacuum your distributor needs it as well so you'll have it anyway.
 
The only vacuum controlled item on your 700 is the lock up clutch. There is a low vacuum switch located on the firwall, usually near the brake MC. This switch ulocks the TC at high engine loads (low vac). There is also a little delay valve in front of the switch (looks like a check valve). The switch is connected to full manifold vacuum.

Just a a little FYI:
You can actually adjust how much delay there is before the TC unlocks by changing the length of vacuum hose between the delay valve and the switch; longer hose, longer delay, shorter hose, shorter delay.
 
let me just make sure i follow....
so basically if i dont mess with the vacuum switch or anything related to the trans and just swap out the distributer and carb and set up the tv cable correctly on the carb, and make sure that there are no vacuum leaks after i remove the emissions componants, then all the bases should be covered?
 
Your 70's Quadrajet if later 70's will have the same throttle linkage and everything as your computer carb . NO TV adjustment needed . Just replace carb .

Worked for me .
 
will have the same throttle linkage and everything as your computer carb
Click to expand...
Wait, are we sure he has a computer carb? Did all 86s get computer carbs or just Cali trucks? My 85 non-Cal truck is a regular Q-Jet.

If your current carb in non-computer, then I'm not sure that the late-70s Q-jet is going to be any different than your stocker. I think you've got to back into the early 70s to get one pre-APT, and whether those versions offer any more performance is debatable since the APT only helps fine tune the idle/off-idle at part throttle settings.

If you're chunking your computer controlled carb for a regular Q-jet, then by all means proceed.
 
FightinTXag said:
Wait, are we sure he has a computer carb? Did all 86s get computer carbs or just Cali trucks? My 85 non-Cal truck is a regular Q-Jet.

If your current carb in non-computer, then I'm not sure that the late-70s Q-jet is going to be any different than your stocker. I think you've got to back into the early 70s to get one pre-APT, and whether those versions offer any more performance is debatable since the APT only helps fine tune the idle/off-idle at part throttle settings.

If you're chunking your computer controlled carb for a regular Q-jet, then by all means proceed.
Click to expand...

I don't know about 85 but in 86 all the 1/2 tons I have seen are CCC, I am in CA granted but not all trucks here are CA trucks, I do have however an 86 HD 3/4 ton and it has a regular Carb and regular distributor, just like my 76 jimmy, no change at all, except AIR of course, but no CAT.
 
I don't know about 85 but in 86 all the 1/2 tons I have seen are CCC
Click to expand...

Cars are a different story, but I don't think I've ever seen a CCC truck here. Everything in the junkyards (that still have the fuel metering apparatus) is either regular Q-Jet or TBI. I got a replacement cruise control servo off an '86 1/2 ton with a regular Q-Jet at the local Pick-n-Pull.
 
CCC was a CA only deal. You rarely seem them outside of there.

There are carb applications on trucks (454's IIRC) at least until 1989, granted, most were TBI though.
 
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