m5 engine noise

[skeeterm5]

Hi all,

driving home tonight I noticed an odd engine noise, which sounded a bit like the tappet noise from a car from my youth.

Only happened between 3,500 and 4,500 rpm under acceleration. Constant load and noise went away, deceleration through the range and no noise. Once it got to 4,500 rpm noise went away.

Deffo sounded top end although it wasnt very loud. Will ring dealer tomorrow but does anybody have any bright ideas as to what it could be?

btw e60 m5

S

[AC Motors]

Could it be pinking due to crap fuel? where/when did you last fill up?.

[oltarmac]

my e39 did that once.just once.never did it again..weird.

[Neil.D]

Sounds like your big end

[oltarmac]

Neil.D said:

Sounds like your big end

[Dr Dave]

Loose spanner rattling around under the bonnet??

[skeeterm5]

think it is a fuel issue - I normally use Shell V Power but due to an extreme shortage I filled up using esso at a local garage and they didnt have any premium stuff at all.

Have now re filled with Shell V Power and the noise has gone away again. Anyway car going into dealers this week to have a look anyway.

S

[groucho]

Pinking then. My Griffith used to do it if I put low octane fule in it. I only did it once or twice though.