Vapor Canister/charcoal Canister - How To Test

2 posts in this topic

Hi Everyone,

I have a 97 626 v6.

I have been trying to track down a couple of problems with my engine for a while now. Both problems seem to be related to running too lean and/or combustion temperature is too hot so I have been looking for vacuum leaks.

I am attempting to leak test all of the components that use vacuum. One component that I am not sure of how to test is the vapor canister or charcoal canister. The Haynes manual says to remove the canister, plug all of the vent lines then install a vacuum pump to the canister vent shut valve, apply vacuum (pressure) and make sure there are no leaks.

So I assume that the port where the vacuum hose connects leads to the vent shut valve. I plugged the other two ports (one on top and one on bottom) and used a vacuum pump to pull vacuum on the vent shut valve port. The canister will not hold a vacuum at all. The manual implies that it should but I have seen the manual be wrong many times before. The instructions say "vacuum (pressure)" does this mean use a vacuum pump to generate negative pressure or does it mean blow air in to create positive pressure? Do I have the ports identified properly? Can someone tell me if they have ever tested their canister and if it held vacuum? These things are about $40 to replace and I would like to be able to prove that a component is bad before I replace it.

I have seen some other discussions of vapor canisters on other vehicle forums but it seems like most other canisters have 4 ports rather than 3.

Thanks in advance.

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It should be negative pressure because it connects to the purge solenoid. I have a video on it though the V6 is slightly different but when it comes to the charcoal canister itself everything is the same. I don't go over diagnostics for the charcoal canister itself. I had a vacuum pump and additional cheap vacuum gauge on order but the pump never arrived and still going through an issue with the distributor over the billing of both.

I know it's not for the V6 but hope you get something useful out of it that you can relate to your V6.

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