1976 to 1985 K-Jetronic Warm-Up Regulator (WUR) Diagnostic Test Kit

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Use in conjunction with a CIS fuel pressure tester to determine if your WUR is healthy and working properly.

PLEASE NOTE BEFORE ORDERING:  This WUR function test kit is INCLUDED in both the 6-cylinder and the V8 full pressure test kits (see related products below). There is no need to order this separately. But if you already have a CIS pressure tester without these extras, then this kit is for you. Watch the YouTube video below for more information.

1976 to 1985 K-Jetronic Warm-Up Regulator (WUR) Diagnostic Test Kit
$48.85
SKU:
GEG-KJETWURTESTKIT

Product Details

This is all new in 2026

With this kit, you can fully test the warm-up regulator without running the engine or removing the WUR from the engine.

This is what is included and why:

  • Adapter fitting and clear hose for a flow test. You must have good flow for the WUR to work properly at speed.
  • Short switched jumper lead: To run the fuel pump at the relay plug on the W116, W123, and early W126.
  • A long 5-foot jumper leads to run the fuel pump on the R107 - relay plug is behind the glove box.
  • Special plug with alligator clips to power WUR directly from the battery without starting the engine. 
  • Video instructions by Kent for using these four items ONLY. The full pressure test sequence is NOT included.

Kent prefers to run all tests without starting the engine, both for fire safety and to minimize exposure to exhaust fumes. This accessory kit will allow you to do that on all Mercedes K-Jetronic fuel-injected engines. 

You can also use the WUR plug jumper lead to test the bimetallic strip's operation on the workbench.

Related Products:

$174.95

1976 to 1985 V8 K-Jetronic Fuel Injection Pressure Tester w/ Extras

For all M116 and M117 V8 engines from 1976 to 1985 ONLY. See related below for other years and models.

This tester is specific to K-Jetronic V8 engines due to the special fittings and adapters it includes. These included M116 and M117 engines in the W116, R107, and early W126 chassis.

$168.00

M110 6-Cylinder Fuel Injection Pressure Tester with Instructions

For all fuel injected 280 engines from 1976 to 1985.

Why do a fuel system flow and pressure test? Without one, you will not know if your fuel injection is working properly. This is even more pronounced on K-Jetronic engines that incorporate a warm-up regulator.  And guess where that is located on the M110 engine?

$68.00

M110 K-Jetronic Warm-UP Regulator Relocation Kit

For most twin cam 6-cylinder fuel injected engines from 1977 to 1985 - Re-mount the WUR where you can easily get to it.

This is a builder's kit and will require fabrication on your part. That means strap bending, location testing, bracket drilling, and WUR mounting. The kit comes with Kent's video instructions on how to do this and on how to hook up the electrical connector, vacuum hose, and two fuel lines.