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Vacuum hose diagram

Vacuum hose diagram

Postby rodricali [OP] » Mar 16 2011, 3:56am

Hello, I just have repaired a Chevy Silverado 1500 1999 LT V8 5.3L, the mechanic does not remember where to connect the vacuum hoses, the engine is running but im getting rough idle and random misfire. The Chevy dealer just dont know this car as is a direct import from the U.S.A. and they sell Venezuelian chevy only. I checked under the hood and no diagram on it. any help would be gratly apreciate it!.
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Re: Vacuum hose diagram

Postby lzn197 » Mar 16 2011, 2:34pm

Can you show some detailed pictures. Maybe that way we could look at what you have and compare. I am sure other folks on here have a 1999 and could help. You should get a better mechanic though.
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Re: Vacuum hose diagram

Postby Dave62 » Jan 01 2016, 6:17pm

Hi: I have a 1999 Chevy Silverado 5.3l LS extended cab 3 door, there should be 3 to 4 vacuum lines depending on year make and model, mine has the large vacuum hose coming from the brake booster and connects to the back of the intake manifold, the next vacuum line is located on the drivers side fuel rail, this line is attached to the fuel pressure regulator and from there to the top or side of the intake manifold again depending on the year make and model, the next 2 should be a return line going to the charcoal canister and should not be under constant vacuum at all, then you have the 1 vacuum line going to the canister purge valve, if all these lines are in the right place I would have to ask you to do a vacuum smoke test, this will tell if you have any vacuum leaks any where in the vacuum system, I just put together a home made smoke machine to find the vacuum leaks on my Silverado, it worked just fine. now to save you some time and money, please ensure that all of the above vacuum lines are in place and are snug, even the slightest loose fitting will cause a serious vacuum leak, after you know for sure the lines are in order, then you want to contact me so I can forward a picture of my home made vacuum machine, my leak was in the connectors on the fuel pressure regulator caused by hot and cold which over time dried out the rubber causing it to leak. hope this help and fell free to give me a shout I will be more than happy to assist you further. I do have a picture of my vacuum lines however when I tried to upload it, most of the picture was blurred.

Thank you

Dave62
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Re: Vacuum hose diagram

Postby txreap » Feb 05 2016, 2:29am

Dave62, I live in RR, TX. I am chasing a p0446 error code. Changed purge solenoid and swapped gas cap from neighbor's tahoe. Code went away for day, but...I would like to know about your home-made smoke machine. Will you post directions/pics please? Thanks.
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