 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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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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| Tom_T |
Mar 9 2017, 10:35 AM
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TMI.... Group: Members Posts: 8,318 Joined: 19-March 09 From: Orange, CA Member No.: 10,181 Region Association: Southern California
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Hey Curtis,
I don't know why you switched to the Crane, but IMHO you'd be better off with the OE ignition etc., since it won't conflict with the rest of the system. That said, you could first check with known working new parts, the various realys & voltage regulator, just to make sure it's not a fault with one of those, but it won't rule out a short in the realy board itself. Again, my preference on a nice original 76 2L would be to keep it completely stock, but it's your car & your tinker time! (IMG:style_emoticons/default/biggrin.gif) Cheers! (IMG:style_emoticons/default/beerchug.gif) Tom /////// |
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| oakdalecurtis |
Mar 9 2017, 10:39 AM
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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(Tom_T @ Mar 9 2017, 08:35 AM)  Hey Curtis, I don't know why you switched to the Crane, but IMHO you'd be better off with the OE ignition etc., since it won't conflict with the rest of the system. That said, you could first check with known working new parts, the various realys & voltage regulator, just to make sure it's not a fault with one of those, but it won't rule out a short in the realy board itself. Again, my preference on a nice original 76 2L would be to keep it completely stock, but it's your car & your tinker time! (IMG:style_emoticons/default/biggrin.gif) Cheers! (IMG:style_emoticons/default/beerchug.gif) Tom /////// Hi Tom, good to hear from you, thanks for the input. May be a stupid question, but I'm not sure what I am checking for or how to approach it? |
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Posts in this topic
oakdalecurtis Engine run on after shut off Mar 8 2017, 10:18 PM
Mike Bellis Why do you keep starting thread after thread about... Mar 8 2017, 11:39 PM
oakdalecurtis
Why do you keep starting thread after thread abou... Mar 9 2017, 12:59 AM |
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