Fixing all your keys
AO Silver Member
Join Date: Mar 2001
Location: United Kingdom
County: Tyne and Wear
Re: Rattle on exceleration 2.5 v6
If it is only under heavy load then it could it be knocking/pinking? Are you using a quality petrol or supermarket gumph?
It could be that a knock sensor has gone which will prevent ignition retardation. A check on the Examiner program by a dealer or independent shoudl tell you.
A cheaper (?) check could be to run the petrol low then put some super unleaded in and try again.