03' Corolla LE Stock Vacuum Hose Diagram - Toyota Nation Forum : Toyota Car and Truck Forums


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9th Generation (2003-2008) Specific discussion of the 9th generation

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Old 03-28-2010, 06:06 PM   #1 (permalink)
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03' Corolla LE Stock Vacuum Hose Diagram

Does anybody have a complete and detailed diagram for all vacuum hoses for a 2003 Toyota Corolla LE? The reason I am asking is we sold the stock intake about four years ago and had a AEM Cold Air intake installed and now I am going back to stock. I picked up a free stock intake, but I believe it may be from a different model as I have two hoses that now don't have a home. I will provide pictures shortly. Thanks for the help guys!

These photos below are the two hoses that have no home.







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Old 03-29-2010, 08:41 AM   #2 (permalink)
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From a bit of more research I found out that the 03-04's were different and the 05-08's are different and they got rid of both those hoses. I know when I played around with the tiny hose and closed it off and ran my vehicle and then opened it up it was under a bit of pressure after I took a cap off it (that hose definitely sucks air in). The big one when I removed it (see pic #2) from its base while idling the motor bogged down and was choking. So I put it back and just taped it off with duct tape. Can I add one of those breathers to each of those lines? Will that work or hurt anything? Does anyone have any other ideas? Thanks guys!
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Old 03-30-2010, 09:08 AM   #3 (permalink)
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Does any of the experts (Mods or Admins) know of what I can do with the 2nd hose? What is its function and purpose? Thanks!
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Old 06-03-2010, 04:16 PM   #4 (permalink)
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The air box does not look like the one on my 03. on mine there is no hose coming off of the large hose that leads to the throttle body. pict 1 and 2. the lower smaller hose goes to the evap obd canister valve which is below and inboard of the pwm vacuum switching valve on air box. the switching valve leads to the green evap service port. on mine there is a diagram on the hood. I would post picts but they cannot be directly uploaded. hope this helps!
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