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Chris58 · Jan 12th, 2024, 14:48

Hello, I have a Volvo V50 2.0D with 100kw engine. Year 2005.

I'm facing a rather specific issue where the car, upon starting, sounds as if it's running on only 3 cylinders. The engine seems to be misfiring, and the RPM fluctuates. When pressing the accelerator fully, the engine won't rev beyond 1100 RPM.

Before encountering this problem, the car underwent the following servicing:
I disconnected the battery, removed injector number 2, and replaced the gasket, washer. Subsequently, I went to the dealer to get new oil and filters. Upon returning to the garage, I found my friend waiting (who had connected the battery and turned the ignition to the second position to charge his phone) - something I didnt notice of at the time.

After reconnecting the injector, changing the oil (from 5W30 to 0W40), and replacing the oil and air filters, I noticed a warning on the dashboard - a drained battery that was so depleted that the car couldn't be locked.

I have another car designed for audio competitions, equipped with an LTO battery. I used jumper cables to start my Volvo with this LTO battery. I drove for about 10 minutes until the car warmed up. While driving on a straight road in 4th gear, I revved the car up to 4500 RPM and coasted to the nearest intersection where I stopped.

During acceleration, the car suddenly started jerking and couldn't rev beyond 1100 RPM. I had to use the clutch to get to the garage.

OBD diagnostics revealed error code U0140. A professional auto electrician pointed out that the control unit wasn't communicating with the injectors. I checked the CEM, measured resistance on the injectors, and verified the current on the injector connectors - everything appears normal.

I noticed that there is diesel fuel around the injector, leaking from the plastic coupling that serves as the fuel return.
Could this be the cause of the problem? Or is the entire ECU faulty?

I believe the control unit might have forgotten and misconfigured the injector, but the auto electrician insists that this ECU cannot forget an injector. I'm unsure if it is true.

Jan 12th, 2024, 14:48	#1
Chris58 New Member Last Online: Jan 15th, 2024 13:31 Join Date: Jan 2024 Location: Michalovce	Volvo V50 - Not able to rev more than 1100 RPM Hello, I have a Volvo V50 2.0D with 100kw engine. Year 2005. I'm facing a rather specific issue where the car, upon starting, sounds as if it's running on only 3 cylinders. The engine seems to be misfiring, and the RPM fluctuates. When pressing the accelerator fully, the engine won't rev beyond 1100 RPM. Before encountering this problem, the car underwent the following servicing: I disconnected the battery, removed injector number 2, and replaced the gasket, washer. Subsequently, I went to the dealer to get new oil and filters. Upon returning to the garage, I found my friend waiting (who had connected the battery and turned the ignition to the second position to charge his phone) - something I didnt notice of at the time. After reconnecting the injector, changing the oil (from 5W30 to 0W40), and replacing the oil and air filters, I noticed a warning on the dashboard - a drained battery that was so depleted that the car couldn't be locked. I have another car designed for audio competitions, equipped with an LTO battery. I used jumper cables to start my Volvo with this LTO battery. I drove for about 10 minutes until the car warmed up. While driving on a straight road in 4th gear, I revved the car up to 4500 RPM and coasted to the nearest intersection where I stopped. During acceleration, the car suddenly started jerking and couldn't rev beyond 1100 RPM. I had to use the clutch to get to the garage. OBD diagnostics revealed error code U0140. A professional auto electrician pointed out that the control unit wasn't communicating with the injectors. I checked the CEM, measured resistance on the injectors, and verified the current on the injector connectors - everything appears normal. I noticed that there is diesel fuel around the injector, leaking from the plastic coupling that serves as the fuel return. Could this be the cause of the problem? Or is the entire ECU faulty? I believe the control unit might have forgotten and misconfigured the injector, but the auto electrician insists that this ECU cannot forget an injector. I'm unsure if it is true.