W116032 450 SE USA Benzin in Öl

Hi,
what comes to my mind...
There was a guy with a ground shorting of the leads in the trigger-points unit because of broken isolation.
You could read out the triggering under driving conditions. Maybe there is such an intermitting shortment?
Regards
Norbert

Hi Norbert,

whille I normally fully agree with you, here I do not. A shortcut to ground in trigger contact cables would mean that the ECU sees an additional falling edge which would cause one more injector pulse with the same form. What I see here are totally different forms of pulses. That is why I do not believe in a shortcut on trigger contacts. That would however be possible on driver side towards injectors.

As I said I could also imagine that Petr has a problem with his measuring equipment. As we say in German: "Wer viel misst, misst Mist". Petr, I am sorry, that is impossible to translate.

Hi Volker,
isn't it possible the peaks are so strange because of their timing running out of the limits of the ECU?
This is a high-speed-measurement...
I do not have the experience... just an idea.

Regards
Norbert

Hi Norbert,

well the signal from trigger contacts is analyzed by a flip flop and then differentiated before they are run through MAP sensor. The flip flop does not mind how the signal from tC looks like, it is an analogue circuit! Any falling edge will be enough to trigger the following function block.

Good evening
Für uns heißt es: Maß zweimal - einmal schneiden,
Die tschechische Sprache ist, dass Reim -

Am pleased your interest - Perform a thorough new measurement

BR. Petr

Hi Petr,

when you do a drive test, try to do it at part load with 3000/min constantly while measuring. Then I would have a comparison value.