Opel Vivaro 1.9 CDTI Gas Conversion

I have a problem with my Opel Vivaro.

If you park the vehicle with a warm engine and restart it, the car may take up to 30 seconds to respond to the accelerator. The vehicle will run at 800 RPM.
After this time, you can drive for hours without any problems.

A trial exchange has already taken place.

LMM, AGR, Gas pedal, CR pressure sensor, High-pressure fuel pump, all lines checked for air.

Thank you, Chris.

Hello,

It sounds like it's a kind of "emergency mode" situation. Accessing the error log is essential.

Best regards, Rainer

I agree with Rainer, please provide more data about this vehicle. It's a Renopel (Renault / Opel), and it has either a Renault or Opel diesel engine, and most importantly, which one. ...and will also be installed in other systems, which may make assistance easier....

Opel Vivaro 1.9 CDTI, manufactured in 2004, 60KW, F9Q, EDC15


Hi!

Unfortunately, the error memory is empty.

Gaspoti also 100% even when the gas pedal is fully depressed, but nothing happens.

The error usually occurs after the engine has warmed up and been turned off for a few minutes.

The amount of injector return is also quite consistent.

It seems like the high-pressure pump or the MSTG are the only options left.

Just in case, if the high-pressure pump is operated via the built-in mech. Would you actually notice a lack of pressure from a gear pump in normal operation?

What are the temperature sensors saying? Are all the values plausible? Also, also check the pressure sensor (value) as well.

In the event of a pump problem, pressing the accelerator pedal would cause some change. Since your "command" is not being executed, there must be a reason that the MSG knows about, at least perceives

Hi

I once observed the behavior of a vehicle (likely a Vivaro) at work. There was a leaking air intake hose. If the engine control module (LMM) didn't detect that air was being sucked in, it would run very slowly.

Best regards, Eric

ps, this happened when the plug was disconnected from the LMM

Problem: Gas pedal - does not respond on cold start

Models: Vivaro 2001...2007 F9Q-762-1.9 DI| F9Q-760-1.9 DTI All

Complaint: Engine starts and idle is OK,
but no response to the accelerator pedal for approximately 10-30 seconds.

Cause: ECU software calibration problem or
Individual diesel injectors are defective.

Solution:
Use of the new ECU with modified software in production starting with F9Q760
(October 2005) and F9Q762 (April 2005). This software version is
available since TIS CD 65 V.14.500.

Thank you for the information! That's a real blunder...

Problem: Gas pedal - does not respond at cold start





The error usually occurs after the engine has warmed up and has been turned off for a few minutes.

Thank you for your help.

This problem also occurs more frequently when the outside temperature is above 30 degrees.

According to Opel's software version is currently (2005).

Measuring the return flow of injectors during idle is quite consistent across all engines.

I've now temporarily installed all 4 injectors from a perfectly good vehicle and, lo and behold, it works perfectly.

Can the injectors be checked in any other way? €400 per piece is not cheap.

Then they cheat, and the last figure I know is about
Mid 2009 for the F9Q...

Hello,

Quote:

I've now temporarily installed all 4 injectors from a perfectly good vehicle and, lo and behold, it's working perfectly. Can the injectors be checked in any other way?

The task of the engine control unit would be to, if it detects that something is wrong and therefore does not accelerate, also record the reason in the fault memory.
Definitely a bug.

Best regards, Rainer

This strongly suggests a software bug. I have experienced a very similar issue with my Peugeot 206, which has a 1.4 HDI engine (ECU: Bosch), and the fault is reproducible.

Vehicle warmed up on a longer drive, engine has operating temperature. I then drive into a noticeably cool parking garage or underground parking garage. I turn off the engine and start it up again very quickly, and it starts immediately. However, in nine out of ten cases, the subsequent operation of the electronic accelerator pedal is not implemented, and the engine remains idling. The value change "Driver's desire" through accelerator pedal operation is also displayed on the PSA diagnostic tester - but not executed. There were only two instances where a hint was given through the error memory entry "Intake air temperature: Value implausible, sporadic". However, the value change was very low, and the entry was no longer present the following day. When the accelerator pedal is depressed, the engine responds after 20 to 30 seconds of idling. You can easily press the pedal and feel the response. However, this can be achieved by lightly pressing the accelerator pedal during the starting process, after which the accelerator is immediately engaged.

Conversely, a similar error occurs less frequently. It can happen in winter when starting the engine from a warm garage into a frosty environment, where the engine suddenly stalls when it inhales the first cold air. Here, the same error log entry is frequently noted, but not fundamentally.

In the spring of this year, there was a software update from , and people hoped that it would resolve the issue. Unfortunately, it did not. As a test, the combined sensor that measures the intake air temperature was also replaced with a different one. However, the error in the cooler direct reception area could still be reproduced with this sensor as well. The measured values from both sensors were identical in my vehicle.

I initially refrained from further investigations because there were no further ideas, and a more in-depth troubleshooting would have cost me money. However, by chance, I discovered a trick: starting the engine with slightly depressed accelerator pedal, which allows me to bypass the problem for now. The problem was reported in Saarbruecken. The software update and the free replacement of the sensor as a goodwill measure for customer satisfaction were provided. Most workshops would probably have charged me at least one hour of workshop time.

Both issues point to a self-test/injector quantity balancing function within the LMM (Linear Motor Module) control system, which is initiated by the control unit. However, it may only return to normal operation after a timeout.

The only (still) meaningful reason not to accept gas would be uncertainty in the NW KW position, then Wagen should actually be running a bit "unevenly". For example, if the signal is too weak or contains too much noise (e.g., from a warm engine), the MSG could wait according to the strategy and then accept the signal later.

Maybe just check the output values from the NW/KW sensors (in case of error).

If not - a warm welcome to a new episode of "Software bugs that no one can find"


Best regards, Blackfrosch