Go Back   EcoModder Forum > EcoModding > Off-Topic Tech
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 02-20-2015, 11:06 PM   #11 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,020 Times in 1,303 Posts
Clamp off the vacuum line to the regulator and see if it runs better. It won't run perfect since the regulator requires vacuum to make it run lean enough but even with that it should run a lot better than with raw fuel running into the manifold.

The plug not fouling worse nearest the regulator could also depend on how close it is to the idle air circuit.

regards
mech

  Reply With Quote
The Following User Says Thank You to user removed For This Useful Post:
California98Civic (02-22-2015)
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 02-20-2015, 11:19 PM   #12 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,020 Times in 1,303 Posts


lousy video

regards
mech
  Reply With Quote
Old 02-22-2015, 10:35 PM   #13 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
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)
Thanks: 2,373
Thanked 2,155 Times in 1,463 Posts
Rented the proper gauge from O'Reilley and the fuel pressure regulator failed the test specified in the FSM. I bought a new regulator for $80 (with tax) and installed it. I took it for a test drive, and the engine ran normally. My DD is back in action for tomorrow morning's commute.

Thanks all, and especially OldMech, who nailed this diagnosis perfectly.
__________________
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.



  Reply With Quote
The Following 2 Users Say Thank You to California98Civic For This Useful Post:
darcane (02-23-2015), user removed (02-23-2015)
Old 02-22-2015, 10:54 PM   #14 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,522 Times in 1,123 Posts
Kudo's to OldMech for "...tele-commuting..." diagnostics, par excellance!
  Reply With Quote
The Following User Says Thank You to gone-ot For This Useful Post:
user removed (02-23-2015)
Old 02-22-2015, 11:23 PM   #15 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,020 Times in 1,303 Posts
Glad it worked out but don't forget to make sure the oil is not diluted. We used to check it by smell and when it was real bad you could light the oil on the dipstick on fire and it would burn.

If it's close to time just drop it and refill with fresh oil.

Your tank mileage will suffer severely.

On the first FI Z cars in 1975 Nissans system was licensed from Bosch. They had a flap air flow meter and all the injectors fired at the same time (not sequentially). Two things would flood that engines out in a very short time.

Open circuit in the water temp sender+massively rich engine died almost instantly. Jump the connection to the sender to daignose.

Fuel pressure regulator diaphragm ruptured, ran very rich but usually would keep running if you flogged the crap out of it.

Saw a live show of the Jersey Boys tonight, tickets courtesy of the two step daughters Christmas present. Great show for those who lived in that era.

regards
mech

Last edited by user removed; 02-23-2015 at 09:18 AM..
  Reply With Quote
Old 02-23-2015, 01:05 AM   #16 (permalink)
In Lean Burn Mode
 
pgfpro's Avatar
 
Join Date: Apr 2009
Location: Pacific NW
Posts: 1,428

MisFit Talon - '91 Eagle Talon TSi
Team Turbocharged!
90 day: 41.03 mpg (US)
Thanks: 1,031
Thanked 484 Times in 316 Posts
Nice work Mech
__________________
Pressure Gradient Force
The Positive Side of the Number Line

  Reply With Quote
The Following User Says Thank You to pgfpro For This Useful Post:
user removed (02-23-2015)
Old 03-07-2015, 08:36 PM   #17 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
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)
Thanks: 2,373
Thanked 2,155 Times in 1,463 Posts
Undoubtedly, the fuel pressure regulator change fixed the problem [EDIT: fixed it for a little while]. For two weeks almost everything has been normal, but slightly longer starter motor turning before she fires-up. And I think I was in a little denial, because all the previous issues that started this thread just came back this afternoon with a vengeance. Suddenly, the car sputters, the short term fuel trim leans-out steadily during a pulse at 75-80% load. It will get as lean as -28% short term fuel trim in a single pulse. Does that every time, over and over. Go into neutral and a new symptom is that it will sometimes stall. Stalling events sometimes are preceded by an idle speed that is unsteady: rpms 180 and then 500 and then 900 and then 700, 900, 800, and then stall or... you get the idea. Sometimes it does that and then keep running. The one thing that never returned quite to normal after replacing the fuel pressure regulator was the starting cycle, which required slightly longer cranking almost every time. Pre-priming the fuel pressure with the key only sometimes seemed to solve the problem. I have been meaning to look into it, but there are always a few things with this car, and I gotta live and work too. Haha! Back to testing...

Any ideas?
__________________
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.




Last edited by California98Civic; 03-07-2015 at 09:13 PM..
  Reply With Quote
Old 03-07-2015, 08:48 PM   #18 (permalink)
Liberty Lover
 
j12piprius's Avatar
 
Join Date: Feb 2011
Location: central california
Posts: 587

pris prius - '12 Toyota plug in prius
90 day: 71.09 mpg (US)
Thanks: 417
Thanked 83 Times in 60 Posts
Perhaps the WAI is the issue, since that's when the problems began.
  Reply With Quote
Old 03-07-2015, 08:58 PM   #19 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
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)
Thanks: 2,373
Thanked 2,155 Times in 1,463 Posts
If so, then it must be because of air restriction. the IAT temps are not higher in an absolute sense from temps I have seen for years. Today was still a little under 130 degrees. I have seen 145+ with previous WAI configurations. But those were bigger diameter tubing. This is the first that is more restrictive than stock. But even if it is the WAI... why take weeks for a problem to form. Wouldn't the engine react quite quickly?
__________________
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.



  Reply With Quote
Old 03-07-2015, 09:18 PM   #20 (permalink)
Liberty Lover
 
j12piprius's Avatar
 
Join Date: Feb 2011
Location: central california
Posts: 587

pris prius - '12 Toyota plug in prius
90 day: 71.09 mpg (US)
Thanks: 417
Thanked 83 Times in 60 Posts
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.

  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com