Hi all, lately my 2011 Colorado has been rattling (sounds like pinging) under load, very noticeable in 4th and 5th accelerating or uphill, sounds like it is coming from the EGR side of the motor when driving, cant get it to do it whilst stationary.
I did have a EGR fault come up the other week and cant remember what it said but I have cleared it now, but that day it did push coolant out the overflow (temp gauge wasn't hot) ? Vehicle has just ticked over to 100,000klms.
Injectors?
Regards Herby