 Engine run on after shut off, Narrowing it down, now what? |
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| oakdalecurtis |
 Mar 8 2017, 10:18 PM
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#1
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Oakdalecurtis  Group: Members Posts: 1,329 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California 
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'76 2.0 FI, stock motor except for a Crane ignition. All engine parts are functioning properly, no vacuum leaks, motor does not run hot, 600 to 700 rpm idle, just passed CA smog easily today. The car runs perfectly EXCEPT for 3 to 5 seconds or more of "run on" after the ignition key is turned off. Dave D suggested unplugging the four pin connector on the relay board in the engine bay at shutdown to see what happens (it powers the FI). I did that experiment and it stopped the engine "run on" instantly. That would suggest that the FI is getting power somehow after the ignition switch is off, right? What does anyone think I should try next to narrow down the source of the problem? (BTW, DaveD does not recommend a diode on the alternator light wire, could adversely effect charging, and I would prefer to find the actual problem too). Any ideas?
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| Mike Bellis |
Mar 8 2017, 11:39 PM
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#2
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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Why do you keep starting thread after thread about the same topic? (IMG:style_emoticons/default/WTF.gif)
Clearly you have a voltage feedback problem. If it started after you installed the Crane ignition, that's your problem. If you don't like the diode idea, install a relay to isolate the circuit. |
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| oakdalecurtis |
Mar 9 2017, 12:59 AM
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#3
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Oakdalecurtis Group: Members Posts: 1,329 Joined: 5-June 15 From: Oakdale, Ca Member No.: 18,802 Region Association: Central California
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QUOTE(Mike Bellis @ Mar 8 2017, 09:39 PM)  Why do you keep starting thread after thread about the same topic? (IMG:style_emoticons/default/WTF.gif) Clearly you have a voltage feedback problem. If it started after you installed the Crane ignition, that's your problem. If you don't like the diode idea, install a relay to isolate the circuit. Sorry Mike, meant no offense. I felt the situation had changed based on new information, that's all. Can you tell me more about isolating which circuit with a relay so I make sure I'm going about it correctly please? |
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Posts in this topic
oakdalecurtis Engine run on after shut off Mar 8 2017, 10:18 PM
Tom_T Hey Curtis,
I don't know why you switched to ... Mar 9 2017, 10:35 AM oakdalecurtis
Hey Curtis,
I don't know why you switched to... Mar 9 2017, 10:39 AM |
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