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Old 08-12-2018, 03:46 PM   #36 (permalink)
Cyborg ECU
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,297

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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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?
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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