What is the vacuum tank for? - Toyota Nation Forum : Toyota Car and Truck Forums

Nervous · 10-23-2010, 11:27 PM

Hey, today I was working on my Camry 96 V6 sedan and I found out that one of the rubber tubes going from the engine to "vacuum tank" is completely destroyed and ripped. The "vacuum tank" is located under the battery tray and looks similar to charcoal canister but it is smaller. I had no MILs and seems to me that tube is broken for a long time already. What is that "vacuum tank" for?

Jason.MZW20 · 10-23-2010, 11:48 PM

It holds reserve vacuum for the ACIS system, so that it'll operate even when the engine has low vacuum, like at WOT.

Nervous · 10-24-2010, 08:57 AM

So, basically it is useless?

***JohnGD*** · 10-24-2010, 01:57 PM

No, it's not useless, It's got one-way valves similar to the brake booster.

It will make sure the vacuum system operates properly. If it's leaking it may be sucking in dirt. I'd would replace it with proper parts.

Quote:

Originally Posted by Nervous

So, basically it is useless?

Nervous · 10-24-2010, 09:18 PM

But still, what is the downside of this part went bad or vacuum leak there? Loss of power?

Jason.MZW20 · 10-24-2010, 09:36 PM

Quote:

Originally Posted by Nervous

But still, what is the downside of this part went bad or vacuum leak there? Loss of power?

Your ACIS won't switch/operate, so the shorter runners will never activate. So, yes, you will lose power in the higher RPM range.

You can temporarily loop the vacuum connection, so that the shorter runners will activate at cetain times, but once the engine doesn't have enough vacuum to keep the butterfly valve closed, it'll again move to the longer runners. Low engine vacuum occurs at various stages. You can also apply engine vacuum directly to the ACIS valve temporarily to have the shorter runners active all the time, but once again, without the vacuum reservoir, it'll be sketchy.