How to troubleshoot D Jetronic Bosch fuel injection system?
Chapter 13 of D-Jetronic articles by Dr-DJet describes systematic fault finding (troubleshooting) and repair on your Bosch fuel injection system. Adjust valves, even if your workshop manager claims that your engine has hydraulic valve lifter Check all vacuum hoses and pipes for false air. Even D-Jetronic will fail with massive false air.
How much fuel does a D-Jetronic engine use?
Fuel injectors and some D-Jetronic components are colour coded. Again and again I see components from other car manufacturers or other motors and the engine runs satisfyingly in some load states. However it will not run well at all loads and engine speeds and will likely consume 20 l / 100 km.
When did Bosch start using mechanical fuel injection?
Approximately up until 1994 mechanical fuel injection systems have been installed on certain Mercedes, Audi, Volkswagen, Ford etc. car models – starting with Bosch K-Jetronic, and after that – Bosch KE-Jetronic. These fuel injection systems were considered to be really reliable and trustworthy.
How to troubleshoot a K-Jetronic jet engine?
K-Jetronic Troubleshooting – From a couple of specialists 1 1: Ignition. Inspect the cap, rotors, wires, and plugs. 2 2: Fuel delivery inadequate. Check for binding of airflow sensor, control plunger, incorrect control or system pressure… 3 3: Injectors. Unequal delivery or poor spray pattern. Do a test and More …
Chapter 13 of D-Jetronic articles by Dr-DJet describes systematic fault finding (troubleshooting) and repair on your Bosch fuel injection system. Adjust valves, even if your workshop manager claims that your engine has hydraulic valve lifter Check all vacuum hoses and pipes for false air. Even D-Jetronic will fail with massive false air.
Approximately up until 1994 mechanical fuel injection systems have been installed on certain Mercedes, Audi, Volkswagen, Ford etc. car models – starting with Bosch K-Jetronic, and after that – Bosch KE-Jetronic. These fuel injection systems were considered to be really reliable and trustworthy.
Fuel injectors and some D-Jetronic components are colour coded. Again and again I see components from other car manufacturers or other motors and the engine runs satisfyingly in some load states. However it will not run well at all loads and engine speeds and will likely consume 20 l / 100 km.
How long does it take for KE-Jetronic fuel to leak?
The amount of fuel for each of the sections should be equal to any of the other ones. When the disk is completely lifted, no less than 80 ml of fuel should leak out during 30 seconds. Removing the fuel distributor metering unit is actually not that difficult at all.
How many L does a D-Jetronic engine consume?
However it will not run well at all loads and engine speeds and will likely consume 20 l / 100 km. Unfortunately this has created a nickname for D-Jetronic in German: Thirst Jetronic ( D -urst is thirst in German). I do prefer the other nickname Thinker-Jetronic ( D -enker is thinker in German).
Why is my D-Jetronic fuel pump not working?
D-Jetronic receives power from a separate wire attached to your plus pole. So even if everything seems to work on your car including starter, it can be that ECU and fuel pump will not receive any power if this specific wire is loose. And that happened on the middle of the bridge. Someone helped me push my car off the bridge where it started again.
Where are the power Suply lines on a Jetronic?
If you measure on sensor instead, you risk to oversee problems with your wiring harness. Your ECU has two power suply lines, one for the ECU itself ( pin 16) and one for injector drivers ( pin 24 ). If you omit 12V on pin 24, your ECU will operate as normal but just not drive the injectors.
However it will not run well at all loads and engine speeds and will likely consume 20 l / 100 km. Unfortunately this has created a nickname for D-Jetronic in German: Thirst Jetronic ( D -urst is thirst in German). I do prefer the other nickname Thinker-Jetronic ( D -enker is thinker in German).
How to troubleshoot a Bosch D Jetronic engine?
injector shuts off. air valve and let air to be drawn into it.If the engine speed increases greatly,replace the auxillary air valve. 2)Temperature sensor 2 is also critical to cold operation. confirmed first as they are more likely to cause this problem.
D-Jetronic receives power from a separate wire attached to your plus pole. So even if everything seems to work on your car including starter, it can be that ECU and fuel pump will not receive any power if this specific wire is loose. And that happened on the middle of the bridge. Someone helped me push my car off the bridge where it started again.
If you measure on sensor instead, you risk to oversee problems with your wiring harness. Your ECU has two power suply lines, one for the ECU itself ( pin 16) and one for injector drivers ( pin 24 ). If you omit 12V on pin 24, your ECU will operate as normal but just not drive the injectors.
What does over run shut off do on a Jetronic?
Tricky people use the over-run shut-off to provoke a sawing of the engine. Therefore you open the air pipe from auxiliary air valve to engine, creating massive false air. If your idle-run switch is closed, this will trigger over-run shut-off to cut off injectors when your engine has reached a definite speed.
What kind of fuel injection does a Mercedes 450SL have?
As we progress on our journey through the 1975 Mercedes-Benz 450SL, it is important to look at the D-Jetronic or D-Jet fuel injection system. With these systems aging and parts needing to be replaced, it is a good time to look at the general function of this system and the various components.
What should I replace in my Mercedes 450SL?
Now that the engine is known to truly run, it is time to fit the very old D-Jetronic system with new parts. Replaced were all rubber injection lines, fuel injectors, Mercedes Fuel damper and fuel pressure regulator. These parts are several critical components that must be functioning perfectly to deliver fuel properly.