hi guys I have a ford focus 2000cc with a duratec engine which is lumpy at idle I replaced the plugs and coil packs before starting diagnostics, the car had a lpg retrofit kit fitted which during investigation was removed , the engine is showing no fault codes so out came the scope. I have checked the crank and cam shaft sensors (trace attached below) and they seem to be fine.
crank v cam.BMP (281.3 KiB) Viewed 1947 times
But the petrol injectors are pulsing after the main pulse which is timed correctly intermittently about 30% of the time on all four cylinders and can be seen in the scope trace .
crank v injector.BMP (281.3 KiB) Viewed 1947 times
as everything else seems ok any ideas ? is this an ecu fault? would you expect a trace like this from a petrol injector?
Nick, Not sure if this will help you. here is a 2003 Focus 2.0L Zetec. Hard to tell but your cam transition seems to be at 70 deg ATDC. Still in PIP high(bearly) window BUT That's probably why its not coding??? The file I have is 50 deg. ATDC. Like I said hard to tell. Hope this helps you.