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Old 03-04-2008, 01:39 PM
Registered User
Join Date: Jun 2005
Posts: 20
CIS K Warm-Up Regulator

UnwiredTools Product Announcement:

The UTCIS-V replaces the Bosch Warm-Up Regulator in your Mercedes vehicle. If you have a difficult time starting your car hot or cold, then you may need a new Warm-Up Regulator. A replacement WUR may be very expensive or not available at all. A core-based rebuild would get you back on the road but all WURs wear out eventually and they're difficult to adjust and impossible to adjust precisely. The WUR controls your car's power and fuel economy. If you have to replace it anyway, why not upgrade it?

Finally, there's a modern digital control replacement/upgrade for Bosch CIS K-Jetronic fuel injection. The UTCIS-V replaces the WUR but it does much more. The UTCIS-V is made from precision machined aircraft aluminum which bolts into the stock location of the WUR. A digital controller measures the control pressure and the manifold air pressure and regulates the system. The control pressure isn't just set, it's regulated! Best of all, this digital controller can be programmed with engine control maps to fine tune your power and economy, just like "re-flashing" a new car. The UT Engine Management Software allows you to tune your engine with the click of a mouse. Engine control maps that you edit or create can be shared with others. The UTCIS gives you the benefits of programmable EFI at a tiny fraction of the cost.

You can order this product from Phil.

UnwiredTools, LLC.

Last edited by whunter; 09-07-2008 at 04:52 AM.
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Old 11-13-2009, 11:49 PM
Daimler Benz technician
Join Date: Sep 2008
Location: Rockledge, Fl
Posts: 130
CIS flowtech in fairhope, AL, offers an amazing warm up regulator rebuild....
Pierre Hedary 1985 280SEL, 1970 111.026 in progress
Mercedes technical advice hotline: 407 765 2867
[servicing older Mercedes in the state of Florida with competence and passion].

From the standpoint of an honest MB technician, Vegetable oil is a threat to your diesel engine's mechanical integrity.
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Old 07-20-2011, 11:53 PM
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Join Date: Jul 2011
Location: Lakeland, Florida
Posts: 7
very lumpy and hunts while belching smoke,

Help! This sounds like this is my problem with a 1980 450sl.
I replaced a fuel pump check valve, a fuel accumulator and fuel filter in the hope it would cure a long cranking issue when hot.. Now when the engine runs, it is very lumpy and hunts while belching smoke, the engine runs fine when on the highway, although the fuel consumption is a dismal 10 MPG. It seems that I can not lean it out any by using the HEX air screw at the CIS. Any ideas?
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Old 10-25-2011, 10:46 AM
Registered User
Join Date: Jul 2011
Location: Lakeland, Florida
Posts: 7
Exaspirating Fuel pressure problem

After many weeks of tinkering, and using a mercedes trouble shooting check list, someone emailed me, I put together a basic pressure gauge and 1/4 inch T piece from Home depot, I purchased some fuel hose and was able to push over the outlet and inlet of the fuel distributor and WUR. The system pressure was below 1Bar. After further reading, I took out the fuel distributor regulator to find the Green O ring totally compressed and the forward O ring hardended and broken in two. A new fuel distributor pressure regulator valve was purchased online for $51 and plenty of adjustment shims. To my great joy, after several adjustments with shims, The system pressure is back up to 5 to 5.6 bar spec.. Now come's the downer.. The replacement overhauled WUR does not seem to be modulating from cold 1.2 bar thru 3.4 bar as the engine warms up... I am back to square 1 with a rough running engine and no clue what to check next..... Any ideas?

PS, I fitted 8 new plugs, an ignition cap and brand new bosch wires..
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Old 10-26-2011, 11:14 PM
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Join Date: Sep 2004
Location: NE Alabama
Posts: 551
Originally Posted by pch2021 View Post
CIS flowtech in fairhope, AL, offers an amazing warm up regulator rebuild....
Great folk to deal with too!
RM Smith
Fort Payne, Al...

RM Smith
1988 560SL

"Where is it again that we are going, and why are we in this handbasket"?
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