Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-27-2004, 04:53 PM
Registered User
 
Join Date: Sep 2003
Posts: 24
1989 190E 2.6 cold start problem

Hi,
This one's driving me nuts. The problem has gradually become so bad that the car now will not start without jumpering the Idle Air Speed Control Valve.

I have removed and used solvent to clean the inside of the Idle Air Speed Control Valve. The air passage is now clean and shiny. If I apply 12Volts and look inside I can see (and hear) it opening and closing.

When I re-installed it the car started fine about three times. Now, in order to get it started I have to remove the air cleaner box and apply 12 Volts to the Idle Air Speed Control Valve terminals. After about 20 - 25 seconds I can remove the jumper and it stumbles it's way to warmth. Once warm, the engine runs fine and idles fine. It will restart with no problems when warm as well. The problem is only when it's cold (overnight).

I have these questions;

i) Is it possible for a Idle Air Speed Control Valve to respond to 12Volts but not to the engine systems?

ii) There are three sensors on the top of the 89 2.6 engine block. Starting from the front there's a two pole, blue-based sensor. Next there's a single pole sensor and right at the back there's a black plastic-based four pole sensor. If one of these is suspect, which one is it?? Is there a way to test if the sensor is defective??

All help appreciated. I have spent a ton of $$ getting the a/c R7R'd and really don't want to throw more $$ into the car if I can avoid it.



Thanks,


Jim

Reply With Quote
  #2  
Old 10-27-2004, 05:21 PM
Registered User
 
Join Date: Jul 2004
Location: York, PA
Posts: 621
The four pole one is the one that tells the CIS-E system the Engine Temp, to fire the Cold Start Valve and Actuate the Idle Air Control Valve as well as the EHA adjustments depending on engine temp. It is called the Water Temp Sensor.
__________________
~Jamie
_________________
2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....
Reply With Quote
  #3  
Old 10-27-2004, 06:15 PM
Registered User
 
Join Date: Sep 2003
Posts: 24
Thanks,
Is there a way to test it? Or better yet, jumper it so that its telling the Idle Air Speed Valve that the engine is cold???



Jim
Reply With Quote
  #4  
Old 10-28-2004, 09:18 AM
Registered User
 
Join Date: Jul 2004
Location: York, PA
Posts: 621
Test the poles diagonally accross from each other. Check the reistance and get back to us. Check it when cold and then when the engine is warm.

Values for cold should be higher than 600 ohms if I recall and around 270 or so when at 80.
__________________
~Jamie
_________________
2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.

1986 190E 2.3 Black, Auto, Mods to come soon.....
Reply With Quote
  #5  
Old 11-04-2004, 04:58 PM
Registered User
 
Join Date: Sep 2003
Posts: 24
Some update info; - please help if u can

Some update info;

I have replaced the distributor cap and rotor with new from the dealer. I have replaced the Water Temp Sensor and I have replaced the spark plugs. The car still idles rough and low until it warms a bit (30 - 120 seconds). Does anyone have any more ideas please???


Jim
Reply With Quote
  #6  
Old 04-09-2007, 03:56 AM
Registered User
 
Join Date: Feb 2007
Location: Southern California
Posts: 10
I decided to resurect this thread rather than start a new one since it already has some info in it. I have a 1989 190e 2.6 that stumbles pretty badly when started cold, smooths-out within about 5 minutes, (@ 60-70 deg. ambient temp), then the idles hunts up to ~1500 rpm at stop lights once the car is at operating temp.

I cleaned the idle control valve and tested it with a jump wire, it clicks and the valve inside just barely moves. Is it supposed to completely close when power is applied? I want to eliminate it as a problem before going further. Also welcome any experience with the symptoms I've posted, sound like typical ICV? Thanks in advance as always.
Reply With Quote
  #7  
Old 04-09-2007, 09:17 AM
zcc's Avatar
zcc zcc is offline
Registered User
 
Join Date: Nov 2005
Location: Kuwait
Posts: 610
Check for vacuum leak. Search this forum for vacuum leak.
__________________
Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current


http://search.ebay.com/_W0QQsassZkhazenzcc
Reply With Quote
  #8  
Old 04-09-2007, 10:31 AM
Registered User
 
Join Date: Oct 2004
Location: Baton Rouge La
Posts: 2,632
pull ovp and shake it.... if it rattles its bad... even if it doesnt rattle it could be bad..

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]
Reply With Quote
Reply

Bookmarks

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
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 04:46 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page