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Old 04-08-2008, 12:18 AM
Join Date: Jun 2007
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omalley576 is an unknown quantity at this point
Default Vacuum Diagram

I'm lost in vacuum land. I have a million splitters, some capped off, and what appears to be some incongruencies in what I THOUGHT was connected before I went to AutoZone and what can no longer be connected the way I thought it was... if that makes sense.

1994 Chevy S-10 Blazer 4.3L "W" with what I think is the "evap canister" on the passenger side, near the front, not attached to the actual hood. (It appears theres about 1.2 billion configurations for this guy).

I've found a page with 30 diagrams on autozone's web site, but I'm not real sure which one applies... if ANY of them do.

Can anyone please help?!
--'94 S-10
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Old 04-09-2008, 12:09 PM
Join Date: Aug 2007
Location: utah
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94blazer4.3ho is an unknown quantity at this point
Default RE: Vacuum Diagram

I dont have an actual diagram but i think i can walk you through most vaccum lines
first from the back of the intake manifold it splits within an inch one to a four way tee with a one way valveand the other im not sure it is a hard plastic.
from the four way tee one to the "vaccum ball" second is hard plastic to the heater/AC control, third goes to the cruise control, fourth goes back to the transfer case then back to the front for the four wheel drive system. hope this helps.
i have been through alot with my blazer in the end its worth it / 1994 s10 blazer with 4.3L V6 vin W 135000 miles new fule injector, EGR valve, water pump, fanclutch, termostat, radiator, front sway bar bushings, bilstein front shocks,
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Old 09-01-2009, 03:41 PM
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vindy78 is on a distinguished road
Default Same issue

I'm in the same boat as the original poster. I have the 2wd though. Automatic transmisson. My issue is when I'm looking at all the diagrams provided on autozones website. They referance things such as "Engine vacuum schematic-1994 4.3L(VIN W) engines with A/T (Code TDU)" Of course I know my engine and transmisson but what I dont understand are the CODES. There is Code TKS, Code TDS, Code TDM, Code TDU, and Code TNA. How in the world am I suppose to know which one I have..Hmmmm I have posted the diagrams as well.

Thanks in advance
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 Vacuum Diagram-enginevacuumschematic-199443lvin-4.jpg    Vacuum Diagram-enginevacuumschematic-199443lvin-3.gif    Vacuum Diagram-enginevacuumschematic-199443lvin-2.jpg    Vacuum Diagram-enginevacuumschematic-199443lvin-1.jpg    Vacuum Diagram-enginevacuumschematic-199443lvinwen.jpg  

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Old 09-01-2009, 04:23 PM
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1986 Chevrolet K Blazer
Join Date: Jan 2009
Location: Austin, TX.
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oisinirish is an unknown quantity at this point

It appears to me that you can narrow it down some by checking the valve covers. The three diagrams on the left show PCV tubing going to both of them.

There's a link on here somewhere to help you read your RPO TDU..etc. Your codes are probably in the glove box on a sticker.

1986 K5 4X4 Blazer
305 CID Rochester Quadrajet
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Old 10-24-2010, 09:22 AM
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I have A 1991 S10 blazer 4.3l, 4x4- I have a vacuum line loose and do know where it goes. Do anybody have a Vacuum diagram for this year model.
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Old 08-03-2013, 08:29 PM
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Default vacuam head aches

please help i have 1993 s-10 blazer w/4.3L 4wd i need a complete vacuum diagram does anyone know where i can find one
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