- Sep 1, 2021
Hi puggit/pluggit (is that right?)Pete. Another wee follow up to my last post. The engine ECU learns the angular relationship between the camshaft and crankshaft when the engine is running - which it gets from the sensors on both - and stores this info. If anything alters this relationship (like slackening and retightening the cam sprocket bolt I think) the ECU notices and will light up the engine warning light - MIL - on the dash. When you interrogate the ECU you'll often find it's logged a fault code for a missfire and you can waste lots of time and money looking for this non existent missfire! If the MIL lights up after a belt change, to let the ECU learn the new relationship between the two shafts, you need to do a "Phonic Wheel Relearn" which requires a good scanner, like Multiecuscan or The Fiat dealer tool. However I found that neither my Panda nor my boy's Punto needed this done following the renewal of their belts and I think it's because that cam sprocket bolt was never touched on either engine. From other posts people have made where their light has come on, it would seem it doesn't come on immediately on starting the engine but usually after a bit of driving around at main road speeds.
So you didn't touch the cam wheel bolt on yours or the pinto then, great, I won't touch it, I will just use the timing locking tools and back it up with the tried and trusted tipex method (sad fact of the day Mike nesbitt from the monkeys who's mother invented tipex passed through yesterday).
PS, my name is Steve, not Pete, pop it in Pete was the imaginary postman Larry grayson used reference, friend of slack alice