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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-21-2010, 03:25 AM   #1 (permalink)
EcoModding Apprentice
 
Join Date: May 2009
Location: Western NC
Posts: 177
Thanks: 3
Thanked 43 Times in 19 Posts
Integra owners, need input regarding fuel cut

Something really wacky is going on with my piggy. Here in the mountains I ride the fuel cut for all it's worth and noticed the other day the idle/fuel resume came back at 1500 rpm instead of the usual 900 or so. Well, I thought it was my imagination but now the idle/fuel resume has seemingly been rising higher to the point where it now resumes fueling at 2000 rpm. Does anyone have a stock 94-95 integra LS who can report back to me what the warm fuel resume rpm is with the stock ecu just for a sanity check?

I tried using a crome program and a different ecu but the same thing even when I lowered the idle resume, yet I have no idea what that program bases its fuel cut routine on, probably the stars in the sky. I reset the tps and no change, I closed off the idle air bypass completely and same thing.

Thanks for feedback.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-22-2010, 08:16 PM   #2 (permalink)
Master EcoModder
 
Join Date: Jul 2008
Location: Silly-Con Valley
Posts: 1,479
Thanks: 201
Thanked 262 Times in 199 Posts
Vacuum leak?

-soD
  Reply With Quote
Old 01-22-2010, 11:48 PM   #3 (permalink)
Master EcoModder
 
Ryland's Avatar
 
Join Date: Jan 2008
Location: Western Wisconsin
Posts: 3,903

honda cb125 - '74 Honda CB 125 S1
90 day: 79.71 mpg (US)

green wedge - '81 Commuter Vehicles Inc. Commuti-Car

Blue VX - '93 Honda Civic VX
Thanks: 867
Thanked 434 Times in 354 Posts
the engine is tracking engine speed, coolant temp, oil pressure, engine vacuum, o2 sensor temp, vehicle speed and I think that is about it, I would guess that either you do have a vacuum leak or an o2 sensor that is going bad, or that your engine is getting to cold.
  Reply With Quote
Old 01-23-2010, 12:12 AM   #4 (permalink)
EcoModding Apprentice
 
Join Date: May 2009
Location: Western NC
Posts: 177
Thanks: 3
Thanked 43 Times in 19 Posts
The stock honda fuel cut routine (among the civics and integras at least) is to my knowledge a function of manifold press, TPS, and questionably ECT's. That should be the only requirements.

I sealed the manifold off completely of all vacuum leaks to the point it would not idle and the problem was still the same. BUT it occurred to my in my sleep that the MAP sensor may be going bad under certain temperatures. I popped another one in and what do ya know, fuel resuming at 850 rpm now and I can get my mpg back. I've never seen a honda MAP sensor do that.

Took me a couple weeks to find it, but it's fixed now. Thanks guys

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Killing a Diesel - a detailed how-to (much info on commonrail technology) Piwoslaw DIY / How-to 23 02-11-2011 04:21 PM
Engine braking without using fuel idea Dane-ger EcoModding Central 38 02-04-2010 11:35 AM
mpguino acted up today, lost mpg during fuel cut wagonman76 OpenGauge / MPGuino FE computer 9 06-17-2009 01:25 PM
Basic EcoDriving Techniques and Instrumentation SVOboy Instrumentation 2 11-17-2007 12:38 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com