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Jeep Wrangler YJ
YJ General Discussion
Evap system workaround help
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<blockquote data-quote="deadpool1" data-source="post: 441240" data-attributes="member: 21229"><p>the rules are simple (this system)</p><p>no vacuum<strong> leaks</strong> allowed, mostly all leaks are via 2 paths normal the ISA and you right foot throttle valve plate, closed a idle.</p><p>the ISA must not be dead, (idle speed motor) if is dead and stuck closed the engine stalls. (no air , it stalls)</p><p>0.050 orifice leaks are not leaks (evap or pcv) those are normal. unless the orifices are missing and now a huge VAC leak.</p><p>the tank vent at CAN, must now be open to the atmosphere. so fumes can naturally vent, free.</p><p>my photo x means blocked. means plug the hose up fully. is best.</p><p></p><p>does this help?</p><p>if not say why ?</p><p>also , we can not know if other things are wrong ! on any 30 year old car.</p><p>hoses connected wrong , kinked, clogged or cracked or fell off.</p><p>the FSM book is free that covers every inch of this. I see you found 1 page called vacuum map.</p><p></p><p>also learn other sellers of cars like this. with the ISA dead (omg so common this old)</p><p>they then cause a new VAC leak, to make engine idle and not stall, and most times they find a vac hose to pull and cause and illegal leak , Illegal means a non- factory mod or alteration of the Jeep design. AKA as a HACK in today's terms.</p><p>so there is that too, to deal with when found, none of that I can see , typing here in the blind.</p></blockquote><p></p>
[QUOTE="deadpool1, post: 441240, member: 21229"] the rules are simple (this system) no vacuum[B] leaks[/B] allowed, mostly all leaks are via 2 paths normal the ISA and you right foot throttle valve plate, closed a idle. the ISA must not be dead, (idle speed motor) if is dead and stuck closed the engine stalls. (no air , it stalls) 0.050 orifice leaks are not leaks (evap or pcv) those are normal. unless the orifices are missing and now a huge VAC leak. the tank vent at CAN, must now be open to the atmosphere. so fumes can naturally vent, free. my photo x means blocked. means plug the hose up fully. is best. does this help? if not say why ? also , we can not know if other things are wrong ! on any 30 year old car. hoses connected wrong , kinked, clogged or cracked or fell off. the FSM book is free that covers every inch of this. I see you found 1 page called vacuum map. also learn other sellers of cars like this. with the ISA dead (omg so common this old) they then cause a new VAC leak, to make engine idle and not stall, and most times they find a vac hose to pull and cause and illegal leak , Illegal means a non- factory mod or alteration of the Jeep design. AKA as a HACK in today's terms. so there is that too, to deal with when found, none of that I can see , typing here in the blind. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Evap system workaround help
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