I guess that this is a good time for me to ask my first serous question on AO
So, about a month ago, while normally driving along, in one moment the power from the engine was instantly taken away, just like I'd release the gas pedal. When I pressed the pedal to the end, nothing happend - I had to put my leg off the pedal and when I stepped on the pedal again, it was working normally again, like nothing happened. This went on for a week or so. I usually do around 40-50 kilometers per day, and in that first week that has happened 0 to 2 times per day. After a week Motor Control System Failure light has appeared on my display and in that time power was never automatically taken away. All worked fine. I've called a frend of mine, and he checked my car with AlfaDiag and found out, that a Camshaft sensor was causing the MCSF light. He deleted the error.
After the light was turned off, the problem with gas repeated again after 2 days. Soon after that the MCSF light went on again, and this time there was finally a combination of MCSF light and power lose present. That was week two.
Then MCSF light was off again. Then came the annoying part: The next time it went on, in the same second, power was lost again. I had to press the gas pedal 3-7 times, before the car realised that I've pressed the pedal again. Quite annoying. After a kilometer or two of kicking the gas pedal like using the old sewing machine, gas was working fine again, MCSF was obviously still on.
Today, I drove my car to the service, where they replaced the Camshaft sensor (and thermostat, which was not working for the last few months
). After a few hours I got it back and I was the happiest person alive - my car was flawless........for the 15 kilometers
After that, the gas was taken away again, but the next kick got it back. No MCSF light so far.
So, that made me thinking: Probably the potentiometer on the gas pedal is here to blame.
Is it possible, that the potentiometer is damaged and that he is messing the Camshaft sensor to mailfunction?
I have a chance to get a spare potentiometer for 60€ (I could buy a new one at the service area, but it only comes in a bundle with new gas pedal, so the price for this is around 300€ - thanks but no thanks) but what if a problem is somewhere lese? I really don't get it.
My car is 147 JTD m-jet (140hp) year 2003.
PS: Sorry for extremley detailed description of my problem, but I guess, that there is no other way