Hallo
After a short period of time and the engine speed drops when the vehicle is stationary, the engine control lamp comes on and when it is switched on again, fuel Fail 44 is in the speedometer
then I cleaned the butterfly, air flow meter and idle regulator. since then the idle speed has increased to 1200-1500rpm. Accelerating power is there.
Throttle valve butterfly on closed 0.55v (less does not work) ans adjust in 0.05mm
oxygen sensor: heater 5ohm voltage has 12v. measuring line in idle (warm)
while driving it goes down further and further until it reaches 0.1volt. it doesn’t commute either … but sinks more and more
the fuel pressure is at 2.8bar while accelerating it increases to 3.2bar. after switching off the pressure is kept at 2.8bar. Fuel pump and pressure is OK . injectors were expanded. are dense and atomize cleanly on two jets.
The engine control light comes on relatively early and is noticeable with a brief drop in engine speed when the vehicle is stationary or when moving off.
it drops to about 500 rpm on D.
the approach is then very delayed.
does not accept gas for a short time and then drives off at once.
then the engine control lamp comes on
then wanted to set the idle. but that is not possible because the regulating screw is already turned all the way in.
Speed is at 1400-1500 rpm every now and then it fluctuates.
Air flow meter arrives 12v. between Pin1 and Pin 6 there is a resistance of 650ohm.
if I unplug the air flow meter, the error 44 remains and no new one is added.
so far everything has been dismantled … there is no air leakage to be found. either it is really the Oxysensor because it does not swing a curve but shows steadily decreasing milli volts (which I almost don’t think they actually never break) or the air flow meter because it does not show 1000 ohms as described in the literature …?
I bought the vehicle second-hand, because the speed was sometimes too low, I cleaned the butterfly, air flow meter and idle regulator. since then I have Fail 44
I’m slowly getting stuck.
the vehicle is from 03/1990 is a 4.0. why does he have no AIR / EGR system?
I hope WE find the bug, thanks for all the tips in advance.