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Old 07-17-2003, 09:41 AM
Posts: n/a
First I would like to say what a strange coincidence, I have a 91 Trooper and an 87 300E.

The evap emissions control canister stores fuel vapors from the gas tank when the engine is not running, and are purged when above idle, purge is controlled by vacuum and/or electric selenoids

You will want to check the purge selenoid vac lines and elec connections, if equipt, all vac lines to purge canister, it has the thermostatic vacuum switch in the intake manifold that may be bad, or the selenoid may be bad, or a line could be plugged.

Haynes makes a good manual for the Trooper, about $16 and well worth it.
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