2003 Chevy S10 4.3 Vacuum Diagram, Where Does This Vacuum Hose Go

I have a 2003 s-10 pickup with a vacuum leak and am looking for a piping diagram so I can replace bad vacuum lines

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Here are two that I was able to find regarding the vacuum lines. Both are for the 4.3L V6. The 3rd one is for the HVAC system. NOTE: These are general diagrams from GM. If you have a different routing diagram under the hood, follow it, but I will assume you don't have that.If there is something specific or a specific area that you need, let me know. Also, (I don't know if this helps) but you should have around 12psi vacuum at the intake at an idle. If that is low, you have a leak. If you maintain that and still feel you have a problem, don't look for disconnected or broken hoses, but rather, look for kinked or collapsed hoses.Let me know what you find and if this helps. (CHECK THE IMAGES BELOW)Joe





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Hello, Here is the vacuum line routing diagrams you have requested. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
I put a 350 into my s-10 replacing the 4.3L. I eliminated the AC. Now I have no vacuum at the heat/defrost control. Looking at the schematics on your web site most lines are hooked up to a canister. I don't recall the old setup ever having one. Do I just need to run one of the lines to the front of the carburetor or where would I get a vacuum source? All the lines on the control are colored and I assume one of them is the main feed, correct? If not, is there a main feed? Thanks for your help.
Hello, Yes, you will need to bring vacuum in from a source, probably through the firewall. I have included the vacuum diagram for your vehicle and original engine in the diagrams down below. Please let us know if there is anything else we can help you with.Thanks,
I just bought a 2000 s10. It needs some TLC, but I bought it right.There is a vacuum line just “hanging” back behind and to the left of the ABS unit. There is also a connector just “hanging” there also. I can find no place to hook either of them up.I carried the truck for a state inspection this AM, and it failed because some items were “not ready&#34. I am wondering if this is caused by the vacuum and electrical lines that are not hooked up.Is this possibly part of the vapor cannister unit?The electrical line can't be stretched very far, and there are no empty connectors with the length of the wires.Any ideas will greatly appreciated.Thanks, Jim
HiIs there vacuum on the hose? Possible vacuum for HVAC does it work?What color are wires? And iis it a terminal connector/Also why did truck fail? Emissions? Brakes? Exhaust?Let me know

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The vacuum hose comes from the throttle body and goes over behind the ABS and goes through what is apparently a check valve and then T”s off. One branch is just hanging there and the other appears to go down and toward the rear of the truck. There IS vacuum on the line.I found that the electrical connector is supposed to hook up to the ABS. It connects to a Kelsey-Hayes unit. But when I plug it in, the Kelsey-Hayes unit has a motor that begins running. I let it run for a couple of minutes to see if it would “equalize” and turn off, but it did not. The ABS light is on with or without the connector plugged in. Will this affect the state inspection which is basically emissions.The catalytic converter was plugged when I got the truck. I have had it replaced.When I carried the truck to be inspected, there were no codes, but the technician said that the state computer said that some items were “not ready”. He could not, or would not tell me any more. He said that it usually needed driving (a couple of hundred miles was what he suggested). I have since picked up a code that says it has a #1 misfire. Plugs, wires and maybe a coil pack would probably help that.Any ideas on the loose vacuum line and the ABS problem?Thanks, Jim

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