Intake Phase Variator angle - Alfa 159 2.2JTS
Posted: 06 Dec 2011, 17:36
Firstly, thank you for a great product - your software does everything I could wish for and more.
I've only found one issue so far - the Intake cam phase variator angle in degrees. At tickover, this shows a desired value of 0.000 degrees but a measured value of 34 degrees. If I blip the throttle, the desired value changes to a few degrees negative but the measured value changes to -263 degrees!! The values don't change smoothly up and down but jump from one value to another
I thought at first that it might be a sensor or timing problem on the car, but the engine runs normally and there are no fault codes stored in the Motronic control unit. If the variator was over 30 degrees away from the desired value however, it would definitely have thrown codes. And of course a value of -263 degrees is impossible and again would have thrown an unfeasible code. I'm therefore wondering if the FES software is possibly misinterpreting the data?
As an aside, the values for desired and actual for the exhaust phase variator are exactly as expected and match to within a fraction of a degree within a very short time when changing the engine speed. The values also scale up and down smoothly.
Ian
I've only found one issue so far - the Intake cam phase variator angle in degrees. At tickover, this shows a desired value of 0.000 degrees but a measured value of 34 degrees. If I blip the throttle, the desired value changes to a few degrees negative but the measured value changes to -263 degrees!! The values don't change smoothly up and down but jump from one value to another
I thought at first that it might be a sensor or timing problem on the car, but the engine runs normally and there are no fault codes stored in the Motronic control unit. If the variator was over 30 degrees away from the desired value however, it would definitely have thrown codes. And of course a value of -263 degrees is impossible and again would have thrown an unfeasible code. I'm therefore wondering if the FES software is possibly misinterpreting the data?
As an aside, the values for desired and actual for the exhaust phase variator are exactly as expected and match to within a fraction of a degree within a very short time when changing the engine speed. The values also scale up and down smoothly.
Ian