07-31-2018, 08:30 PM
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#21 (permalink)
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Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
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A-b ... A
5 times a charm! 5 cold starts with no probs, using the Firefly's coil.
I'm going to swap the Metro's coil back on tomorrow and see what happens for the next 5.
But I think that's got to be it (touching wood).
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08-01-2018, 12:00 PM
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#22 (permalink)
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Cyborg ECU
Join Date: Mar 2011
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Cool. "Known good & free" parts make great diagnostic tools, haha! Looking forward to the return of bucking and stalling when the old coil returns to duty.  Then we know!
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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08-01-2018, 02:25 PM
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#23 (permalink)
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Master EcoModder
Join Date: Sep 2012
Location: Victoria, BC
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It just wanted some love and attention. She'll be fine if you treat her right. 
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08-01-2018, 04:24 PM
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#24 (permalink)
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Batman Junior
Join Date: Nov 2007
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I think Stubby might be right: I put the old coil back in and it fired right up. Just wanted some attention?
Intermittent problems are fun!
This is killing my tank average, too ... threatening my 70 MPG goal! SG said ~72 MPG when this nonsense started. Now it's 70.5
I should fill up now to lock it in. Put some of this silliness on the next tank. 
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08-01-2018, 11:04 PM
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#25 (permalink)
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Master EcoModder
Join Date: Jun 2008
Location: Oregon
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Factory Ford troubleshooting has you install a known good part as one of their last steps on some of the diagnostic trees. This is great if you own a known good spare part.
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84 Gmc 6.5 na diesel K30 4x4, TMU
2006 Lincoln Navigator, 215k miles
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08-02-2018, 09:43 AM
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#26 (permalink)
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Cyborg ECU
Join Date: Mar 2011
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Quote:
Originally Posted by MetroMPG
... I put the old coil back in and it fired right up....
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But early in this thread I think you got the same results sometimes and then the problem returned a few starts down the line, no? with the "bad" coil, I would wait to see if it returns. Seems like it might.
Quote:
Originally Posted by MetroMPG
...I should fill up now to lock it in. Put some of this silliness on the next tank. 
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Yes, definitely. Take that bummer off the list of bummers in trouble shooting.
__________________
See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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08-02-2018, 10:42 AM
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#27 (permalink)
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Batman Junior
Join Date: Nov 2007
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Quote:
Originally Posted by California98Civic
But early in this thread I think you got the same results sometimes and then the problem returned a few starts down the line, no?
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Correct.
Quote:
with the "bad" coil, I would wait to see if it returns. Seems like it might.
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I'm hopeful.
One other thing I thought of: a simple run of cold starts might not be a valid test. I need to actually drive the car: heating the coil up might be part of the problem? I'll be using it again this weekend. (And I did have a couple of longer drives with the known good coil.)
For those still keeping track at home:
- Trouble-free cold starts on the Firefly's coil: 5/5
- Trouble-free cold starts since re-installing the Metro's coil: 2 (so far)
Quote:
Yes, definitely. Take that bummer off the list of bummers in trouble shooting.
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Done!
First kilotank (1k+ km = 620+ miles) in the beater Metro: 72 MPG US!
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08-03-2018, 04:06 AM
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#28 (permalink)
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Not Doug
Join Date: Jun 2012
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"We need a known good part."
"This is a Ford."
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08-03-2018, 09:29 AM
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#29 (permalink)
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Batman Junior
Join Date: Nov 2007
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- Trouble-free cold starts since re-installing the Metro's coil: 3 (so far)
Have I mentioned yet how much I hate intermittent problems?
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08-03-2018, 08:07 PM
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#30 (permalink)
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Master EcoModder
Join Date: Jun 2016
Location: KY
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I’ve had two coils fail in my LSJ before I upgraded them, and I’ve had two coil packs fail on my L61, before swapping to the one I’m running now... the failures have always presented as a constant misfire though...
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My last Ecotec project...
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