Model - Mercedes Benz 220 v boot

Problem -
The car just goes off on its own when in motion or static at random times.
The spark plugs are okay. The relay is okay. Even tried direct connections instead of using the relay. Same problem

Gurus in the house please help

Cc Siena

Run diagnostics (scan) and bring the codes here. It will be good to furnish us with car details, year of manufacture, engine size, etc

ivoryhouse:
Run diagnostics (scan) and bring the codes here. It will be good to furnish us with car details, year of manufacture, engine size, etc

Okay sir. Just a moment

oieda:


Okay sir. Just a moment

Hello.

How do u intend to run a scan on a w124? A v booth?

Fuel, Air, Spark

Check to ensure your fuel pump is good.

Is the car an injector or carb? If carb, get it cleaned up with carb cleaner off the engine...not just spraying whilst running.

Check your throttle. Get it cleaned and adjusted to allow idle

Check for vacumm leaks. Spray little bursts of carb cleaner all around the carb and hose joints.

Is it an ignition system with contact set or a breakerless system?

There is a wire called 'the green wire'. Hope it is not damaged and fully secure.

Ensure your ignition control unit by Bosch is still OK. No water ingress etc

Do you have an air filter in place? Ensure the air filter is clean and in place. If not, it could have sucked in a whole universe of gunk.

Your spark plug wires must be okay and securely connected.

Kindly revert after troubleshooting with these steps. A picture of the engine bay would help a lot

Car specification needed.

If your v boot uses the small brain box,and has green wire connected to ur ingnition cup.mostly seen in most manual carb engine,
Then change the brainbox,no let any kazeem use u trouble shoot and make sure u get a good brainbox not more than 4k.

Thank me later.

Thank you Denn bountydog
I'd look into all of those. I will also send a picture of the engine bay

Ivoryhouse and lonelydora I'm no so much of a car guru I may just send a pic. Thanks.

Pictures

Denn:
Fuel, Air, Spark

Check to ensure your fuel pump is good.

Is the car an injector or carb? If carb, get it cleaned up with carb cleaner off the engine...not just spraying whilst running.

Check your throttle. Get it cleaned and adjusted to allow idle

Check for vacumm leaks. Spray little bursts of carb cleaner all around the carb and hose joints.

Is it an ignition system with contact set or a breakerless system?

There is a wire called 'the green wire'. Hope it is not damaged and fully secure.

Ensure your ignition control unit by Bosch is still OK. No water ingress etc

Do you have an air filter in place? Ensure the air filter is clean and in place. If not, it could have sucked in a whole universe of gunk.

Your spark plug wires must be okay and securely connected.

Kindly revert after troubleshooting with these steps. A picture of the engine bay would help a lot

Please check out the pictures I added.
cc bountydog lonlydora ivoryhouse

Thanks again

The symptoms you are describing could be brought about by degradation of the insulation used on the electrical wiring loom of many Mercedes Benz cars manufactured between 1992 and 1996, when your W124 car was manufactured.

You may in the end have to replace the ENTIRE wiring harness for your engine to solve this problem. To verify whether or not the wiring harness of your car has been replaced before you bought the vehicle, look under the hood (bonnet), where the wires go into the battery compartment on the left side as you face the engine from the front. If you do NOT see a label that reads "Delphi", then the wires have NOT been replaced, and you will need to do so in order to solve the problem the car has now, and to prevent a host of other issues that will certainly crop up as further deterioration of the wiring insulation occurs over time.

oieda:


Please check out the pictures I added.
cc bountydog lonlydora ivoryhouse

Thanks again

This is why it is good to upload pictures.

Your car is a newer model w124 with the modern m111 engine.

It is an injector and not a carb.

PS: Papiwata is right. MB opted for what is called 'biodegradable wiring harness' at a point. These wires break down after exposure to heat. You can replace the engine wire harness then replace the shorted components.

PapiWata:
The symptoms you are describing could be brought about by degradation of the insulation used on the electrical wiring loom of many Mercedes Benz cars manufactured between 1992 and 1996, when your W124 car was manufactured.

You may in the end have to replace the ENTIRE wiring harness for your engine to solve this problem. To verify whether or not the wiring harness of your car has been replaced before you bought the vehicle, look under the hood (bonnet), where the wires go into the battery compartment on the left side as you face the engine from the front. If you do NOT see a label that reads "Delphi", then the wires have NOT been replaced, and you will need to do so in order to solve the problem the car has now, and to prevent a host of other issues that will certainly crop up as further deterioration of the wiring insulation occurs over time.

Thank you sir. Will look into this

Denn:


This is why it is good to upload pictures.

Your car is a newer model w124 with the modern m111 engine.

It is an injector and not a carb.

PS: Papiwata is right. MB opted for what is called 'biodegradable wiring harness' at a point. These wires break down after exposure to heat. You can replace the engine wire harness then replace the shorted components.

Thank you sir. Will look into this.

oieda:


Thank you sir. Will look into this

You are welcome. Kindly alert me if my suggestion gets your car running, so that I can forward my banking details to facilitate your consultancy fee payment, bearing in mind that naira remittances can no longer be accepted due to the falling exchange rates.

PapiWata:


You are welcome. Kindly alert me if my suggestion gets your car running, so that I can forward my banking details to facilitate your consultancy fee payment, bearing in mind that naira remittances can no longer be accepted due to the falling exchange rates.