non start the customer has been on all the forums and changed the crank sensor then the cam sensor then subbed the coil pack and it still doesn't start fitted new plugs and set light to himself while spinning the engine over to see if he had fuel with the plugs out it shot a load of fuel out and the plugs that were in the end of all the leads sparked and lit it (i tried not to laugh)didnt cause any damage to the car (or him)
right i did a code read and it came back with co codes stored,code red the immobilizer and again no codes and live data showed keys recognized.
live engine data confirmed correct engine temp and air temp, when i brought up the engine speed/rpm data it was reading about 200rpm but dropping out to nothing. checked the dme relay ok then fuel pump relay pump relay switched positive/on then off and kept switching on and off while cranking.
suspected crank sensor checked with scope and it seemed to give an out put of about 5v p/p i thought might be a little low but haven't got a reference to another. asked where he got it from it came from a factors :-( here we go again tested the cam sensor ok
also checked the ignition and permanent supply and earth to ecu as well as the supply from the dme relay.
tried to scope the coil pack but the signal seemed to be erratic and difficult to capture.
it does try to fire but while cranking for about 30 seconds it will randomly fire now and again.
have recommended a new genuine crank sensor to be fitted and to confirm clean and properly mated surfaces.before going any further.
coil pack has a good feed under crank as does the ecu and fuel pump relay but as i said the pump keeps dropping out
did check the trigger to the relay from the ecu and it is definitely being pulsed looks almost like a square wave or duty cycle
can anyone suggest any thing i may have missed