Hi Guys I use a sensor simulator/signal generator for diagnostic purposes (not a pico product though). It's powered from the vehicle battery and can simulate a wide variety of signals (vary duty/vary pulse/vary frequency/analogue/CMP & CKP waves etc..). I'm not sure if forum rules prevent me from po...

Here's an image from our Oscilloscope Masterclass training course showing valve clearance and valve timing relationship as mentioned above..

Hi FF

Your assumption regarding the engine drawing on a closed throttle may not be the case.

Some engines, during cranking, hold the idle air control valve wide open, thus the incoming air flow circumnavigates the closed throttle via the idle air 'loop'.

Cheers

James.

Hi Steve I am always amazed by the detail and sometime confounding information garnered by the WPS in cylinder. I did a little case study a while back concerning a real world example of varying compressions and valve timing on an engine running fault. I posted the link here http://www.aftermarketonl...