Hi all,
hope you can help.
Car runs perfect, then randomly, at about 1500rpm, it hesitates and stutters then runs normally.
The only pattern seems to be about 1500 rpm, only happens when moving.
No codes
Tested Speed in and out for auto box.
Checked pressures using current data graphing
Checked ABS inputs
Using current data, tested; fuel pressure at rail when fault occurs, the pressure stays constant.
Checked, EGR, AIR MASS, throttle flap( anti judder valve), throttle voltages at pedal, coolant temp.
Using scope, I checked for injector signal, two pilot and one main, checked crank and cam signals.
I am not sure what to try next, I have advised the garage to test drive with scope connected, to see if injector or crank and cam signals change when fault occurs.
Any ideas?
Thanks in advance.
James McCallum