home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > maintenance & nonperformance

Reply
 
Thread Tools Display Modes
Old 06-13-2014, 02:57 PM   #1
atrokz
super cage design genius
 
atrokz's Avatar
 
Join Date: Jun 2007
Location: teedotohdot
Default Low Idle

91 940 SE. (90 760)

I need to set the base idle way to high to get an idle above 600 when in D or R. When hot in P it's up around 1500 rpm and it's 700 rpm in D or R. WTF.

If I set the base idle to 700-800, it idles waaaay to low cold. To the point it will stall.

Replaced FPR with good one. No vac leaks (which would increase idle). Replaced fuel rail. Newish plugs (less than 10k). Ignition components 'seem' ok. ICV motor clicks solidly when in diagnostic mode.

Ideas? Plugs to cold causing poor spark? Would a ICT cause a bad idle cold?

Thanks.
__________________
'06 BMW E91 3.0 DD
91 945 SE - Modded the turbobrick way
98 BMW E36 2.8 - Wife's car
92 245 DL WAS NOT TO BE -RETURNED FOR ZERO SPACE
91 745T RIP
94 850 NA RIP
95 850R GONE


Quote:
Originally Posted by Turbo Joe View Post
Rob Ford was Canadas greatest president
atrokz is offline   Reply With Quote
Old 06-13-2014, 07:05 PM   #2
theknave
Board Member
 
theknave's Avatar
 
Join Date: Mar 2014
Location: Seattle
Default

No codes?
theknave is offline   Reply With Quote
Old 06-13-2014, 08:09 PM   #3
Three Fat Tigers
Board Member
 
Three Fat Tigers's Avatar
 
Join Date: May 2003
Location: ↓ Lynchburg, VA →| '89 740Ti | '90 760Ti | '92 240 | '94 940T | '96 960 | '96 M1
Default

Sounds like and IAC valve issue.

Basics:
Clean out the throttle with some paper towels soaked in carb cleaner + maybe a tooth brush. Remove and clean out the IAC valve, bench test it, should snap closed when 12V is applied. One terminal in the electrical connector should show 12V+, ignition on. Make sure the throttle position switch is adjusted so that it clicks just as you open the throttle. I would also adjust the throttle stop such that when you pinch off the IAC hose, the idle only drops just a smidge (this assumes the IAC is working). Also inspect the brake booster hose, once they get really old and hard, they can hide cracks.
__________________
Three Fat Tigers is offline   Reply With Quote
Old 06-13-2014, 08:37 PM   #4
atrokz
super cage design genius
 
atrokz's Avatar
 
Join Date: Jun 2007
Location: teedotohdot
Default

Cleaned it. Bench tested it and picked the faster of two I have. Tested it via the obd1 test where it actuates so its getting power. Strange.
atrokz is offline   Reply With Quote
Old 06-13-2014, 08:38 PM   #5
atrokz
super cage design genius
 
atrokz's Avatar
 
Join Date: Jun 2007
Location: teedotohdot
Default

TB is clean too. Recently installed the manifold
atrokz is offline   Reply With Quote
Old 06-14-2014, 12:35 AM   #6
awakenthedead
Board Member
 
Join Date: Jul 2011
Default

It does sound like that's supposed to happen when power to the iac is unplugged. I recently had a major hot start and stall issue and because very aquatinted with how that tracts because I had to unplug it to start the car when hot. I'd test power and signal at all temp ranges and gears if you can elevate the rear wheels and make sure it's in spec. Also check the specs on the resistance of the iac you have to make sure they are actually good.
awakenthedead is offline   Reply With Quote
Old 06-14-2014, 08:22 AM   #7
atrokz
super cage design genius
 
atrokz's Avatar
 
Join Date: Jun 2007
Location: teedotohdot
Default

Resistance? Thought it was just voltage on icv motors. Or do you mean ict sensor
atrokz is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 05:27 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.