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Old 08-06-2018, 03:25 PM   #31 (permalink)
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- Trouble-free cold starts on the Firefly's coil: 5/5
- Trouble-free cold starts since re-installing the Metro's coil: 5/5

It's healed!

(Have I mentioned yet that I hate intermittent problems?)


But seriously: now I'm wondering if it might have been a flaky connection to the coil that has been fixed by all the un/plugging.

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Old 08-06-2018, 09:21 PM   #32 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
... now I'm wondering if it might have been a flaky connection to the coil that has been fixed by all the un/plugging.
Maybe. My intermittent starter motor failure healed itself five years ago when I disconnected it, swapped my transmission, and reinstalled the intermittently failing starter. Five years of never fail startup since. Go figure.
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MetroMPG (08-06-2018)
Old 08-07-2018, 07:52 AM   #33 (permalink)
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I had that happen on the old Ranger I drove, the coil contacts got corroded and it sometimes didn’t run right and the tach needle would jump around when it was missing... the cap ended up breaking and I converted to bolt on leads and an Accel coil...
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Old 08-12-2018, 11:11 AM   #34 (permalink)
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I think the MAF on my car was bad. I disconnected it, car ran very poorly. Then i reconnected it. Next startup, I have my power back!

Has not manifested itself again in over a week.
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Old 08-12-2018, 01:55 PM   #35 (permalink)
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Blackfly - '98 Geo Metro
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Last 3: 70.09 mpg (US)

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I've experienced a vacuum leak on a MAF hose before, and it was similar, but not as bad as these symptoms.

I'm up to 8 cold starts with no probs since putting the Metro's coil back in.

However the car did throw a p0400 code on a 200 km trip this weekend. Intermittent EGR valve problem (I've seen it once before). I wonder how a stuck-open EGR valve would make it run.


I need to take it off & clean the valve &passages.
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Old 08-12-2018, 04:46 PM   #36 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
I've experienced a vacuum leak on a MAF hose before, and it was similar, but not as bad as these symptoms.

I'm up to 8 cold starts with no probs since putting the Metro's coil back in.

However the car did throw a p0400 code on a 200 km trip this weekend. Intermittent EGR valve problem (I've seen it once before). I wonder how a stuck-open EGR valve would make it run.


I need to take it off & clean the valve &passages.
Cool. I think you have to consider that the stuck open EGR valve could be the entire problem right there. Or at least it and some other minor factors like connectors for your coil have been intermittently contributing to your rough idle and rough running. I mean, the symptoms of that code would be what you've been experiencing, correct?
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Old 08-12-2018, 08:02 PM   #37 (permalink)
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Quote:
Originally Posted by MetroMPG View Post
I've experienced a vacuum leak on a MAF hose before, and it was similar, but not as bad as these symptoms.

I'm up to 8 cold starts with no probs since putting the Metro's coil back in.

However the car did throw a p0400 code on a 200 km trip this weekend. Intermittent EGR valve problem (I've seen it once before). I wonder how a stuck-open EGR valve would make it run.


I need to take it off & clean the valve &passages.
Bad, very bad. Had an egr that was slow to close, would die everytime it came to a stop. Finally figured it out when I logged engine parameters on a drive. IAT shot to over 250 in mere seconds, only thing that gets that hot is.... exhaust.
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Old 08-15-2018, 04:29 PM   #38 (permalink)
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Blackfly - '98 Geo Metro
Team Metro
Last 3: 70.09 mpg (US)

MPGiata - '90 Mazda Miata
90 day: 51.27 mpg (US)

Winter beater Metro - '00 Chevrolet Metro
Last 3: 66.97 mpg (US)
Thanks: 2,514
Thanked 5,432 Times in 2,777 Posts
Quote:
Originally Posted by California98Civic View Post
I think you have to consider that the stuck open EGR valve could be the entire problem right there. ... I mean, the symptoms of that code would be what you've been experiencing, correct?
It does make sense.


What doesn't make sense: the car ran completely normally on the weekend trip (400 km round trip), despite the EGR code coming up once on the way there and once on the way back. Not a hiccup from the engine: highway & city driving.

Yet when I was having all the cold start problems (now apparently cured), there were no codes at all.

Regardless, I'll be cleaning that EGR valve & passages.

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Latest mods test: 15 mods = 15% MPG improvement: A-B test, 2007 Honda Civic 1.8L, 5-speed
Ecodriving test:
Manual vs. automatic transmission MPG showdown: Nissan Micra 1.6L



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