Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 07-05-2010, 07:49 PM   #1 (permalink)
eco....something or other
 
Join Date: Jul 2009
Location: Colfax, WI
Posts: 717

wood hauler - '91 Ford F-250
Team Pontiac
90 day: 18.97 mpg (US)

Rav - '06 Toyota Rav4 Base
90 day: 26.52 mpg (US)
Thanks: 39
Thanked 59 Times in 45 Posts
I unplugged the idle air bypass

The truck has been wanting to rev a little high between gears and idles high at stop signs every once in a while. I pulled the wire about 5 minutes ago and it idled nice and low the way I like it. Now to test it out.....HMMMM I have a friend that needs brakes done....maybe I will take the truck.

__________________



1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 07-05-2010, 11:21 PM   #2 (permalink)
eco....something or other
 
Join Date: Jul 2009
Location: Colfax, WI
Posts: 717

wood hauler - '91 Ford F-250
Team Pontiac
90 day: 18.97 mpg (US)

Rav - '06 Toyota Rav4 Base
90 day: 26.52 mpg (US)
Thanks: 39
Thanked 59 Times in 45 Posts
......AND GOT 32MPG!!!! I drove from Colfax to Eau Claire and back for a total of 55.xx miles and used approximately 1.7 gallons of gas. I even made an extra stop to help someone who hit a deer(the deer was a complete loss) and had to take off up hill. I have to go back tomorrow so I will see if it comes out the same again. The rpm drops right down to idle between shifts so it enters the next gear perfectly. It idles like silk.
I also plugged the EGR back in....not sure if it works or not but it is plugged in.
__________________



1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
  Reply With Quote
Old 07-06-2010, 12:35 AM   #3 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,257

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 284 Times in 197 Posts
IACV's are annoying, and they're not needed for a smooth idle above a certain engine temperature. In my case, it's around 100F. You'll probably want to leave yours unplugged until autumn rolls around. I've thought about an IACV toggle switch, but the engine kill switch sort of makes that redundant. 0RPM > 1000RPM.
  Reply With Quote
Old 07-06-2010, 08:30 AM   #4 (permalink)
Master EcoModder
 
tasdrouille's Avatar
 
Join Date: Jan 2008
Location: Mirabel, QC
Posts: 1,672

The Guzzler - '08 Hyundai Elantra GL
90 day: 33.12 mpg (US)

Got Soul? - '11 Kia Soul 2U
Thanks: 35
Thanked 85 Times in 56 Posts
I need to do that to the Elantra. Oh, how I like seeing it rev to 2k rpm as I turn the key on a chilly winter morning!
__________________



www.HyperKilometreur.com - Quand chaque goutte compte...
  Reply With Quote
Old 07-06-2010, 09:01 AM   #5 (permalink)
Master EcoModder
 
Join Date: Jun 2010
Location: scotland
Posts: 1,423

The Mistress - '88 Bmw 320i Touring SE
Team m8
Last 3: 27.17 mpg (US)

Germany Beadle - '91 Mercedes 300td (estate, N/A)
90 day: 24.63 mpg (US)

The Bloodylingo - '05 Citroen Berlingo Multispace Desire
90 day: 39.77 mpg (US)

Shanner Scaab - '03 Saab 9-5 estate Vector
90 day: 26.19 mpg (US)
Thanks: 88
Thanked 86 Times in 72 Posts
Quote:
Originally Posted by tasdrouille View Post
I need to do that to the Elantra. Oh, how I like seeing it rev to 2k rpm as I turn the key on a chilly winter morning!
My Parents Toyota Avensis (97 year model) does this- it holds 1500 for about 30 secs after start up- seems to be an inbuilt way of getting the engine toe temperature quicker..

has anyone compared the time and fuel required vs not having it?
  Reply With Quote
Old 07-06-2010, 10:22 AM   #6 (permalink)
Master EcoModder
 
comptiger5000's Avatar
 
Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
Thanks: 1
Thanked 26 Times in 23 Posts
My Jeep isn't too bad with the IAC. It revs to 1500 and settles right back down on startup (when cold, about 1200 when warm). I think my coolant temp sensor is reading too warm though, as it doesn't do the 900 rpm cold idle that it's supposed to unless it's below 30* when I start it. If I fire it up on a 60* morning, it drops right to normal curb idle (and yes, the IAC works).
__________________
Call me crazy, but I actually try for mpg with this Jeep:



Typical driving: Back in Rochester for school, driving is 60 - 70% city
  Reply With Quote
Old 07-06-2010, 10:59 AM   #7 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 267 Times in 210 Posts
The saturn was annoying on restart, like it would jump to 1800 rpm for a couple seconds.

I just waited till it was warmed up with some accessories on and idling nicely, and unplugged it. I don't need the engine to rev up every restart (which is a lot)
__________________
WINDMILLS DO NOT WORK THAT WAY!!!
  Reply With Quote
Old 07-08-2010, 03:31 AM   #8 (permalink)
EcoModding Apprentice
 
Dr. Jerryrigger's Avatar
 
Join Date: Jun 2010
Location: mass
Posts: 181

The Sh*t-Box - '99 Subaru Impreza Outback Sport
90 day: 27.81 mpg (US)
Thanks: 4
Thanked 9 Times in 8 Posts
My Subaru jumps up to 2,200RPM (2,000 before i used synthetic) and takes about 90sec to drop to 1000, and it idles at ~600. I really should do something about that.
My ex has a dodge Dakota with a busted IACV. It had a broken vacuum hose, so I replaced that, but that only helped the vacuum leek. It would stall out now and then if you didn't have a feel for when it needed a little air. Once it stalled in the middle of a bad intersection, but I kept it rolling as I popped into N and cranked it. I can see why cars have them, but I don't want mine to
Any CEL reaction to the unplug-it approach? It seems like such a simple thing that it wouldn't.... well maybe on a 09 or 10 (but I will not be driving one of those for a least ten year)
  Reply With Quote
Old 07-08-2010, 09:20 AM   #9 (permalink)
Master EcoModder
 
comptiger5000's Avatar
 
Join Date: Feb 2010
Location: CT, USA
Posts: 544

RaceJeep - '98 Jeep Grand Cherokee (ZJ) 5.9 Limited
90 day: 13.62 mpg (US)
Thanks: 1
Thanked 26 Times in 23 Posts
In my Jeep, unplugging the IAC is an instant CEL. When you plug it back in, the light clears after 2 or 3 drive cycles.
__________________
Call me crazy, but I actually try for mpg with this Jeep:



Typical driving: Back in Rochester for school, driving is 60 - 70% city
  Reply With Quote
Old 07-08-2010, 10:56 AM   #10 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,257

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 284 Times in 197 Posts
Dr. J: Let us know if the Subaru throws a CEL.

You should be able to create a fake IACV for the computer to look at. If you don't want to spend a bunch of time at RadioShack, then you could just zip-tie a junkyard IACV next to your throttle body and plug in to that for the summer.

Or perhaps you could create a restriction in the IACV air passage. Be careful that your restriction doesn't get sucked into the engine; the pressure across a throttle plate is enormous.

  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Comparing Warm Air Intakes (WAI) & Cold Air Intakes (CAI) toomuch EcoModding Central 23 05-26-2019 06:41 AM
Honda IACV explained TomO Off-Topic Tech 16 12-21-2015 02:49 AM
start to play with IAT sensor on Mercedes E250D-Turbo 98' poisas EcoModding Central 6 10-07-2013 05:13 PM
Moving air intake into the engine compartment? pasadena_commut Aerodynamics 5 07-25-2008 04:24 PM



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