When the stalling was occurring at say 3000 rpm, boost pressure results were at various levels approx 2000mbar ,air flow approx 400mgs but rail pressure varied from 1100bar to 1500 when stalling occurred.The regulator current was consistently around 1100-1300ma and the pressure sensor was 2.5-3.5 volts nothing out of the ordinary other than the high current draw from the regulator against a known good vehicle current draw of approx 600ma,even later with the other new unit the draw was the same and is obviously correct for this vehicle?
Looking at the output from the regulator both voltage,current and duty cycle together with the voltage from the rail pressure sensor it was difficult to see any real cause and effect until I increased the data to a 5 second time base and looked at the data from the 'helicopter' perspective and immediately saw that the pressure voltage was clearly out of sync with the duty cycle and current from the regulator, again suggesting a defective slow responsive regulator.
I bit the bullet(not a silver one) and tried another regulator.
Doesn't it do your head in when you find the brand new unit fitted was defective.
Fit new unit, scoped system ,road tested perfect and much better clarity from wave forms pressure viz a viz duty cycle and current more lively and responsive,though again difficult to interpret without the facility of multiple records from the oscilloscope.
Thanks again for the constructive input guys.
The name of the game today is if you don't scope you guess.I thought a smoke tester was the best purchase last year,this year will definitely be a picoscope provided we don't go skint chasing jobs like this.(Or maybe a fuel quality check meter??)
