Datum: 07. Juni 2022 14:27
I took the comments and error texts from the Carsoft program.
Unfortunately, they are not entirely accurate.
In the general case, yes, both the pressure regulator and the injection nozzles can be a problem, but in practice I don’t remember this. There was one case when clogged nozzles were to blame, and that was once, the car was operated on LPG. And then I'm not completely sure about this diagnosis, because I did not see it myself (it was a message from my friend who repaired this car).
In reality, more often the fault of this error (except for air leakage) was:
LPG malfunctions (poor-quality gas injectors, spoils the adaptation of the mixture)
Long driving with a faulty MAF and a dirty throttle (usually W202/W210).
But 90% (maybe more) is an air leak. Most often - a leaky EVAP valve (MOT), vacuum tubes jumped off the intake manifold, leakage of seals, such as the intake manifold (very rarely).
The main criterion is that this is not an oxygen sensor and something else - at idle, the lambda control reaches +25%
, but if you keep 2000-3000 rpm, then the lambda control runs below +25% (for example, about +10%
or elsewhere). This tells us that the lack of fuel is only at low costs, and there air leakage is strongly affected. Think about this - a leak of 3 kg / h affects more in which mode - at idle, where the air consumption is 12-15 kg/h (M104) or at 3000 rpm, where the air intake is 50-60 kg/h ?! the answer is obvious.
If in both modes it reaches +25%
, then it is more difficult. more parameters need to be analyzed and often some tests need to be performed, such as enriching the mixture briefly and looking at lambda reactions.
If you have the equipment, you can make an engine test with a program (how to do the test is written on the [test plan] button) and send me logs with a link to this topic
. I look and tell the reason (if I can). It will be free.
We will correspond more time than it takes to analyze the log.
My solutions for troubleshooting Mercedes release 93-98:
Diagnose von Mercedes M104 und M111-Motoren mit einem Laptop auf eigene Faust.
Diagnosegerät (OBD2) und Reiserechner für Mercedes Motoren M111 und M104 mit HFM oder PMS auf einem Tablet/Smartphone