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Old 03-07-2015, 09:22 PM   #21 (permalink)
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Recheck the fuel pressure, could be a #$%^&*()_ pos replacement part. Check the plugs to see if they are dark.

regards
mech

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Old 03-07-2015, 09:44 PM   #22 (permalink)
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Quote:
Originally Posted by johnlvs2run View Post
Perhaps it causes some damage that takes a few weeks of driving to get worse.

Idk, but if it was me I'd remove it and see what happens.
Did that previously... and no change

Quote:
Originally Posted by Old Mechanic View Post
Recheck the fuel pressure, could be a #$%^&*()_ pos replacement part. Check the plugs to see if they are dark.

regards
mech
Yeah, that makes sense. Try again...

james
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Old 03-07-2015, 09:50 PM   #23 (permalink)
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Did that previously... and no change
Well if it hasn't been on, then that's obviously not the problem.
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Old 03-08-2015, 07:33 PM   #24 (permalink)
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Testing today. Got much different pressure readings. With regulator vacuum hose off and pinched. Car not running. Not warm. I primed the pump and got 10-20psi, when 38-46psi is the spec. Two weeks ago, this test showed 42psi repeatedly.

So then I reattach the vacuum line. The FSM says pressure should climb slightly, but it didn't. However, two or three priming cycles with the key and it climbs close to the normal range.

Also unlike two weeks ago, the pressure quickly drops off, if I get it even close to normal, whether the vacuum line for the regulator is connected or not.

What the hell?
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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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Old 03-08-2015, 07:45 PM   #25 (permalink)
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It could be a bad fuel pump, odds are bad regulator, replace and retest. Plug check?

regards
mech
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Old 03-08-2015, 07:57 PM   #26 (permalink)
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Quote:
Originally Posted by Old Mechanic View Post
It could be a bad fuel pump, odds are bad regulator, replace and retest. Plug check?

regards
mech
I ran the test again just now, and now I get no fuel pressure at all in the first test. Zero. I can hear the pump prime. Could a failing pump create the symptoms I have seen? too much fuel causing trim to get leaner, then too little fuel causing a stall?
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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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Old 03-08-2015, 08:57 PM   #27 (permalink)
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Seems I have successfully tested fuel pressure gauge failure. The gauge is not working. I can run the car while the pressure gauge shows zero fuel pressure. Lol. Gotta go get another. This car is parked for a day or two more. Time to bum a work ride for tomorrow morning!
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Old 03-08-2015, 09:19 PM   #28 (permalink)
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Geez, we had a Belden Drum Doktor (brake drum only lathe) at my old shop that was probably older than I was and it worked fine, lots of equipment around here dating back to the Arsenal of Democracy of 70+ years ago. Glad I don't have to deal with the frustration of parts AND tools I can't trust.

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Old 03-08-2015, 11:51 PM   #29 (permalink)
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I disconnected and returned the aftermarket fuel pressure regulator too. I'm confused about whether the pressure gauge ever gave me an accurate read, which could mean the OEM regulator was fine and the gauge lead me to think it was not. Because I could not test the replacement regulator, I don't conclusively know if it was defective. So there remain three possibilities to explain the symptoms: (1) bad regulator, (2) bad regulator and a secondary problem too, or (3) the regulator was fine but something else entirely was responsible for the symptoms. Frustrating how many variables and unknowns there still are. Oh well. Scrounge the rides I need!
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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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Old 03-09-2015, 03:18 AM   #30 (permalink)
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I wouldn't say this if you had a fuel trim code, but sometimes the extra info is more like extra noise. About a year ago I had an unstable idle, saw my fuel trim sitting around -15%. Looked for something causing me to be running rich, but I found and repaired a vacuum leak. That fixed idle issues, drove / ran fine, but fuel trims moved up to -22%. I still don't know why my fuel trims are so far off.

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