Quote:
Originally Posted by 78F350
JFP, I've come across a couple bad charcoal canisters recently. Would that be a likely cause of this? Is there a troubleshooting procedure for the evap system for someone like this without a Durametric or advanced test equipment?
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Probably age more than anything else. When gas evaporates, it leaves behind a varnish like material that builds up over time, blocking lines and locking up the control valves. Diagnostic's are simple: are the lines clear and do the valves function.
1 - EVAP canister purge valve
2 - EVAP canister
3 - Purge air
4 - Tank
5 - Pressure sensor
6 - Shutoff valve
7 - Operating purge valve
8 - To intake manifold
9 - Vacuum control valve