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Jeep Wrangler YJ
YJ General Discussion
YJ restoration project (air in fuel line?)
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<blockquote data-quote="deadpool1" data-source="post: 439375" data-attributes="member: 21229"><p>done many barn cars, restores and sold many, (not my day job) !,</p><p>seen it all, all kinds of failures. for 59 years doing this, (i did 4wd car flips for 10 years)</p><p>the tests are easy. using real tools.</p><p>inspections too.</p><p>one way to learn is DOING. and asking for help , you did. Bravo that. !</p><p>live help is 100x best, after all online we are blind, can't see damage and is there.</p><p></p><p>This EFI system has rules (MPI 4 injectors and PCM)</p><p>rule #1 is ASD< the ASD relay must close,and stay closed cranking or the pump relay and ASD relay both disabled, by PCM on purpose.</p><p></p><p>a voltmeter is needed, as is learn the 3 key on test for DTC blink out error codes.</p><p>hearing a pump run means near zero, only PSI matters on EFI. (electronic fuel injection) same with dribble tests. if not a drop the pump is dead. sure.</p><p></p><p>the PCM cuts ASD for these reasons, and the fuel pump too, the 2 relays use the same wire to energize them.</p><p>PCM does that .</p><p>the FSM is free to see, ask for it, free PDF to have , hold and read, for sure chapter 8w full car schematics.</p><p></p><ol> <li data-xf-list-type="ol">ASD drops dead (and pump relay) if PCM sees CMP or CKP dead. ( cam or crank sensors dead, or cam chain snapped off)</li> <li data-xf-list-type="ol">ASD dies for 02 sensor shorted so unplug it. a free easy no tools test</li> <li data-xf-list-type="ol">ASD drops out if HV spark coil goes shorted (primary pins)</li> <li data-xf-list-type="ol">ASD drops out if any overloads sensed , at output pin of the ASD relay main contacts.PCM monitors this pin all the time key on.</li> <li data-xf-list-type="ol">this sensed wire (buss) feed is called <strong>A142</strong> in the schematics, nothing on this wire feed can be shorted. ever.<br /> </li> </ol><p>this is first, not pulling gas tanks, in my book taking a bath in fuel is last. benzene is nasty stuff.</p><p></p><p>the fuel LINES 2, one is full 36psi pressure cranked. the other is the<strong> FPR return line</strong></p><p>the return line sure can have air in it any time pump is off line. key off . it simply drain to the tank and is now full of air.</p><p>The pressure like primes each time the key is turned on and this prime means all air from pump to 4 injectors are purged of all air in this line.</p><p>keyon3 times and all air is gone. (pump and FPR both good ok?)</p><p>the supply goes to filter then to fuel rail</p><p>then the FPR uses the return line to return fuel to the tank and forms fuel loop.</p><p>the pump must pump for 3 seconds keyed on, each time, the pressure at the rail is 36psi, dibble tests do not prove 36psi ever. thus the tools.</p><p>that is my nut shell tests. EFI, </p><p></p><p>most barn cars found ive ever seen the injectors are all fully or 1/2 clogged. hopeless .</p><p>and all fuel lines filters and take a filth mess and gas there nasty smelling and full of slime.</p><p>and lots more,</p></blockquote><p></p>
[QUOTE="deadpool1, post: 439375, member: 21229"] done many barn cars, restores and sold many, (not my day job) !, seen it all, all kinds of failures. for 59 years doing this, (i did 4wd car flips for 10 years) the tests are easy. using real tools. inspections too. one way to learn is DOING. and asking for help , you did. Bravo that. ! live help is 100x best, after all online we are blind, can't see damage and is there. This EFI system has rules (MPI 4 injectors and PCM) rule #1 is ASD< the ASD relay must close,and stay closed cranking or the pump relay and ASD relay both disabled, by PCM on purpose. a voltmeter is needed, as is learn the 3 key on test for DTC blink out error codes. hearing a pump run means near zero, only PSI matters on EFI. (electronic fuel injection) same with dribble tests. if not a drop the pump is dead. sure. the PCM cuts ASD for these reasons, and the fuel pump too, the 2 relays use the same wire to energize them. PCM does that . the FSM is free to see, ask for it, free PDF to have , hold and read, for sure chapter 8w full car schematics. [LIST=1] [*]ASD drops dead (and pump relay) if PCM sees CMP or CKP dead. ( cam or crank sensors dead, or cam chain snapped off) [*]ASD dies for 02 sensor shorted so unplug it. a free easy no tools test [*]ASD drops out if HV spark coil goes shorted (primary pins) [*]ASD drops out if any overloads sensed , at output pin of the ASD relay main contacts.PCM monitors this pin all the time key on. [*]this sensed wire (buss) feed is called [B]A142[/B] in the schematics, nothing on this wire feed can be shorted. ever. [/LIST] this is first, not pulling gas tanks, in my book taking a bath in fuel is last. benzene is nasty stuff. the fuel LINES 2, one is full 36psi pressure cranked. the other is the[B] FPR return line[/B] the return line sure can have air in it any time pump is off line. key off . it simply drain to the tank and is now full of air. The pressure like primes each time the key is turned on and this prime means all air from pump to 4 injectors are purged of all air in this line. keyon3 times and all air is gone. (pump and FPR both good ok?) the supply goes to filter then to fuel rail then the FPR uses the return line to return fuel to the tank and forms fuel loop. the pump must pump for 3 seconds keyed on, each time, the pressure at the rail is 36psi, dibble tests do not prove 36psi ever. thus the tools. that is my nut shell tests. EFI, most barn cars found ive ever seen the injectors are all fully or 1/2 clogged. hopeless . and all fuel lines filters and take a filth mess and gas there nasty smelling and full of slime. and lots more, [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
YJ restoration project (air in fuel line?)
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