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 11-04-2011, 02:36 PM
Registered User
 
Join Date: Jan 2002
Location: England
Posts: 1,841
Piece of crap idle control valve

So I was kindly renovating the rubber pipes on my 190E, fitting nice new ones for it. However in the process I decided to clean out the idle control valve by removing and filling the inside with carb cleaner. Well what a mistake that turned out to be. Now the thing is jumping around all over the place, sometimes. 2000rpm, sometimes 700, frequently stalling. What a disaster.

So what can I do? Can I make this piece of rubbish work right (it was absolutely perfect before, I guess I shouldn't have messed with it) or does it need replacing? I tried some spray lube inside there in case I had dried it out with all that carb cleaner, but no luck.

I have also concluded the whole KE Jetronic setup is a giant compromise that should never have got past the drawing board. Suitable for a military vehicle perhaps but not a car. Rant over...

__________________
190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
Reply With Quote
  #2  
Old 11-04-2011, 02:52 PM
Registered User
 
Join Date: Dec 2007
Location: NorCal
Posts: 1,332
K-Jet is actually robust, and reliable. I've cleaned out a few ICVs with carb cleaner and never had one issue. Are you sure you got the rubber hose onto the head properly? It's really hard to get seated properly...if not...you would have a HUGE vacuum leak, stalling, etc.

Did you orientate the ICV the correct way too?
__________________
http://i193.photobucket.com/albums/z...-RESIZED-1.jpg
1991 300E - 212K and rising fast...
Reply With Quote
  #3  
Old 11-04-2011, 03:09 PM
Registered User
 
Join Date: May 2009
Location: The slums of Beverly Hills
Posts: 8,065
Quote:
Originally Posted by pentoman View Post
I have also concluded the whole KE Jetronic setup is a giant compromise that should never have got past the drawing board. Suitable for a military vehicle perhaps but not a car. Rant over...
Agreed. KEjet is a collosal POS. Check to make sure you idle activation switch is still aligned properly and being triggered when you close the throttle.
__________________
CENSORED due to not family friendly words
Reply With Quote
  #4  
Old 11-05-2011, 02:54 PM
Registered User
 
Join Date: Jan 2002
Location: England
Posts: 1,841
Cheers for replies.
In terms of vacuum leaks it seems okay, I have a vacuum tester which shows 15 - 17 in at idle depending on where you connect it. The economy gauge sits all the way left when at idle. I starts much more immediately since replacing the rubber pipework - even now when it is doing its bad idle. However I will double check vacuum just in case. I will bear in mind your comments that the IACV should not be damaged just by cleaning with carb cleaner and try to think of other culprits. Can I open the IACV up to look inside?

I still do suspect it's the IACV that's the problem though. My reasoning is because, if the idle is too high and I tap the IACV with something metal, then the idle comes down the more that I tap it. Which makes me think that it is sticking, somehow, and struggling to move smoothly on its own. That's why I hoped the lube would hell but I guess not.

I believe the direction should be so that air flows in the direction of the arrow embossed onto the IACV, yes?
__________________
190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
Reply With Quote
  #5  
Old 11-05-2011, 04:04 PM
Registered User
 
Join Date: May 2009
Location: The slums of Beverly Hills
Posts: 8,065
Yes, the arrow should be pointed toward the intake manifold (direction of flow). Do you have a 2 or 3 wire ICV? The bosch ICVs are pretty universal to almost all euro cars from that era so you can use another one from pretty much any car.
__________________
CENSORED due to not family friendly words
Reply With Quote
  #6  
Old 11-06-2011, 07:44 AM
Registered User
 
Join Date: Jan 2002
Location: England
Posts: 1,841
Quote:
Originally Posted by tjts1 View Post
Yes, the arrow should be pointed toward the intake manifold (direction of flow). Do you have a 2 or 3 wire ICV? The bosch ICVs are pretty universal to almost all euro cars from that era so you can use another one from pretty much any car.
I have a 2 wire IACV. However thanks for the tip about interchangeability, I didn't realise that would be the case since mine is a rare 2.5-16 190. I actually had a spare but I lent it to someone else to help fix his 190 and can't get it back!

I am still inclined to think that these IACV's can't be very complicated and it can't be hard (if you can open it up) to diagnose what is wrong with it. If only to learn what happened and why it broke to prevent others from doing the same. Anyone ever tried to dismantle?? Or anyone know a good way to test them? What happens if I apply a straight 12v to it from a spare battery I have?
__________________
190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg
Reply With Quote
  #7  
Old 11-06-2011, 07:53 PM
Registered User
 
Join Date: Oct 2010
Location: Mornington Peninsula Australia
Posts: 56
Quote:
Originally Posted by pentoman View Post
What happens if I apply a straight 12v to it from a spare battery I have?
It will just open and close.

If it does it sporadically like my old one it usually needs a clean. If you have already done this and it still misbehaves it might be just worn out.

They are listed here and are generally readily available so they must be something that needs replacing every now and then. Although the price makes my eyes hurt.

PeachParts FastLane Mercedes Parts Store
__________________
1990 300TE

"24 hours in the day. 24 beers in a case. Coincidence? I don't think so."
Reply With Quote
  #8  
Old 11-10-2011, 09:10 AM
Registered User
 
Join Date: Oct 2006
Location: Indian Waters, Florida
Posts: 136
ICV

Quote:
Originally Posted by pentoman View Post
So I was kindly renovating the rubber pipes on my 190E, fitting nice new ones for it. However in the process I decided to clean out the idle control valve by removing and filling the inside with carb cleaner. Well what a mistake that turned out to be. Now the thing is jumping around all over the place, sometimes. 2000rpm, sometimes 700, frequently stalling. What a disaster.

So what can I do? Can I make this piece of rubbish work right (it was absolutely perfect before, I guess I shouldn't have messed with it) or does it need replacing? I tried some spray lube inside there in case I had dried it out with all that carb cleaner, but no luck.

I have also concluded the whole KE Jetronic setup is a giant compromise that should never have got past the drawing board. Suitable for a military vehicle perhaps but not a car. Rant over...
You are partially correct.
As a Mechanical Engineer, I can unequivocally state the the Bosch ICV in and of itself is not a POS. However, the entire K-Jet system as a whole IS a HUGE POS, Rube Goldberg, clap trap, overly complicated, WTF, fuel delivery system. If only someone made a replacement intake manifold for a carb they would be financially well off. Look at all the expensive, delicate crap (and weight) that could be eliminated from these cars. It is readily apparent that KISS is a totally alien concept to German (fuel delivery) Engineers.

Yes Virginia, the Emperor is naked.

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 01:53 AM.


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