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RKramden |
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#1
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Newbie ![]() Group: Members Posts: 41 Joined: 26-October 19 From: So. California Member No.: 23,589 Region Association: Southern California ![]() |
This is my first time starting a topic, I don't know if I am even typing in the correct location, but I am having an issue with my '74 LJet and fuel pump. The pump starts with the ignition switch, Pump also runs when Air sensor arm is manually moved. However when starting, it seems that the air sensor is somehow cutting off the fuel pump circuit. The PO had bent the arm so it never opened, but I have bent it back to move as designed. If I disconnect the electrical plug to the Air Sensor, the car starts and runs fine......any thoughts? BTW I have replaced the dual relay, but that did not fix the problem.
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RKramden |
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#2
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Newbie ![]() Group: Members Posts: 41 Joined: 26-October 19 From: So. California Member No.: 23,589 Region Association: Southern California ![]() |
SUCCESS---kind of
Ohm tested the AFM and was 290 between 6 & 9, and 170 Between 7 & 8 and 36 and 39 were infinite when closed and 0 when open....all per spec. Decided to check these same readings at the ECU plug and found the same (with the AFM plugged in) except between 7 & 8 when sometimes I would get an infinite reading. Started jiggling those two wires all the time watching the reading change from infinity to 170 (note that I had previously stripped the plastic sheathing off of the ECU wiring harness looking for possible breaks a while ago). Worked my way back to the AFM plug where the problem seemed to be coming from. I removed the rubber surround on the plug and found that I could move #7 in and out ever so slightly, and make the Ohms switch. I cut the plug off and crimped new individual connectors on, and viola!....It started and stayed on with all wires connected! Now it wants to die when I punch it, but I can get the RPMS up by feathering the peddle. I will replace the rubber hose between the AFM and the throttle body that just arrived and check for any other leaks......Any other suggestions?......how much tension or slack should there be in the throttle cable at the TB connection? |
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