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1st Gen S-series (1983-1994) Tech Discuss 1st generation s-series (1983-1994) general tech topics here.

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Old 04-07-2008, 11:18 PM
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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?!
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Old 04-09-2008, 11:09 AM
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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.
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Old 09-01-2009, 02:41 PM
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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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Old 09-01-2009, 03:23 PM
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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.
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Old 10-24-2010, 08:22 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, 07:29 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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