Warm-up regulator test (Bosch K-Jetronic)
Bosch K-Jetronic · all makes
Warm-up regulator test at a fixed price
Before you put money into a new or overhauled regulator: we measure your warm-up regulator on our test bench and tell you, with concrete measured values, whether it is still fine.
and return shipping – credited on overhaul
fully credited
- Control pressure cold, warm and with vacuum – against the Bosch specifications
- Diaphragms tested for leak tightness – fuel section and vacuum
- 49,99 € is credited, if you have it overhauled by us
Our test
What we measure on your warm-up regulator
We only measure – nothing is disassembled or adjusted on your regulator. That way you see exactly the condition in which it came out of your car.
Control pressure cold
The regulator arrives cold on the test bench. We measure the control pressure together with the temperature and compare it with the Bosch specification for exactly that temperature. If the cold value is off, the engine starts poorly or runs roughly in the first minutes.
Control pressure warm and heating element
Then the heating element is energized until the regulator is warm. We check whether the control pressure rises to the operating value and measure the resistance of the heating element. An interrupted heating element leaves the regulator stuck in cold running – the engine then runs permanently too rich.
Vacuum and vacuum diaphragm
On regulators with a vacuum connection, we measure the control pressure with and without vacuum – the enrichment under full load depends on it. We test the vacuum diaphragm for leak tightness with a vacuum pump and pressure gauge.
Leak tightness of the fuel section
Under pressure it becomes clear whether the diaphragm and seals in the fuel section are still tight. A leaking regulator loses fuel – a real risk in a hot engine bay.
After the test
You decide how to proceed
Regulator is fine
It goes back to you unchanged, return shipping included. You now know for certain: the fault lies elsewhere.
Overhaul makes sense
You get a clear quote. If you say yes, the regulator stays with us right away – no second shipment – and the 49,99 € is credited in full.
No order
No problem: your regulator goes back to you unchanged and at no further cost.
If you have it overhauled, the test costs nothing extra
If you have your tested regulator overhauled or repaired by us, we credit the 49,99 € in full toward the price.
The credit also applies with express processing or 5-year warranty.
Book test nowWho it's for
When is the test worthwhile?
- The engine runs poorly when cold, but you don't know whether it is the warm-up regulator, the cold start valve or the fuel distributor.
- You bought a vehicle with K-Jetronic and don't know its history.
- You bought a used regulator and want to know whether it works before you install it.
- The car has been standing for a long time, or the regulator sat on the shelf for years.
- You don't have a pressure tester for the K-Jetronic and don't want to guess.
More on troubleshooting in the guide: Warm-up regulator defective? Symptoms, testing and solution
Book now
Book warm-up regulator test
One price for every Bosch K-Jetronic warm-up regulator. Included are:
- Control pressure cold with temperature measurement
- Control pressure warm after heating up
- Control pressure with and without vacuum (depending on version)
- Leak tightness of the fuel section under pressure
- Leak tightness of the vacuum diaphragm
- Resistance of the heating element
- Result with measured values and recommendation
- return shipping within Germany
warm-up regulator test
49,99 €After ordering, you will immediately receive the shipping instructions by e-mail.
Already sure it needs overhauling? Straight to the overhaul
Process
It's that easy
- Book onlineThe shipping instructions arrive immediately with your order confirmation.
- Remove the regulatorTwo fuel lines, connector, two screws. Drain the fuel completely and seal the connections.
- Enclose a note and send it inName, address, phone number and order number on a note – pack the regulator well padded.
- We test and get back to youYou get the result with the measured values and decide how to proceed.
Shipping address:
Widdersdorf 36
84079 Bruckberg
Fits
All makes, one price
Whether naturally aspirated or turbo, with or without a vacuum connection: every Bosch K-Jetronic warm-up regulator (part number 0 438 140 …) is tested with us for 49,99 € tested.
- Mercedes-Benz
- Porsche
- BMW
- Volvo
- Ferrari
- VW
- Audi
- Saab
- and all others with K-Jetronic
Good to know: The later KE-Jetronic has no warm-up regulator – there, the electro-hydraulic pressure actuator takes over this task. Not sure what you have? Send us a photo or the part number.
Your regulator is definitely due?
Then straight to the overhaul: completely disassembled, new diaphragms and seals, adjusted to the Bosch specifications – 400 € incl. return shipping and 2-year warranty.
To the warm-up regulator overhaulFAQ
FAQ
What does the warm-up regulator test cost?
49,99 € fixed price including VAT and return shipping within Germany.
Is the amount credited toward an overhaul?
Yes. If you then have your tested regulator overhauled or repaired by us, we credit the 49,99 € in full. With the overhaul at the fixed price of 400 €, you then pay only 350,01 €. We invoice you for the remaining amount; the regulator does not have to be shipped again for that.
How do I get the result?
By e-mail or by phone – with the measured values, the Bosch specifications for your regulator number and our recommendation.
Is my regulator altered during the test?
No. We only measure – nothing is disassembled or adjusted. Only when you order an overhaul do we work on the regulator.
How long does the test take?
Usually 3–5 business days from receipt of your regulator, plus postal transit time.
What if my regulator is fine?
Then it goes back to you unchanged – return shipping is included in the price. You then know for certain that the fault lies elsewhere.
What do I need to keep in mind when sending it in?
Drain the fuel completely, seal the connections and pack the regulator well padded. Enclose a note with name, address, phone number and order number. Shipping address: KFZ Teile Thot, Widdersdorf 36, 84079 Bruckberg.
Do you also test regulators with vacuum or for turbo engines?
Yes. Every Bosch K-Jetronic warm-up regulator is tested – with or without a vacuum connection, for naturally aspirated and turbo engines, regardless of make.
Does the KE-Jetronic also have a warm-up regulator?
No. On the KE-Jetronic the electro-hydraulic pressure actuator handles the mixture adjustment. A warm-up regulator exists only on the K-Jetronic.
Questions? Give us a call.
Before ordering or in between – we are happy to help. Available Mon–Fri 8 am–6 pm.