Wickid flat spot on my 316I

[Zobby]

i have a 1990 316i
When its sat idleing it will rev freely to the limiter but when driving and accelerating it will only reach 4500rpm then it coughs and sputters and loses power and makes a loud burring noise!
and will not pull for there onwards!
Any help would be appriciated!

Thanx Rik

[noney82]

could it be a misfire?

[Zobby]

Nope dont think so it drives normally up until 4500rpm then burrr and no power! and on the spot (not under driving strain) it will rev freely to th limiter with no noise or flat spot or any problems come to think of it!

[eko]

Worn camshaft,common on M40 engines.

[Brianmoooore]

Take the rocker cover off, and have a look at the tips of the camshaft lobes. Any slight difference in height between the shiney part and the 'spare' bit at either side means it's fubarred!

[uzdubmwe30]

Could also be afm.

[TomCropp]

had the same problem on my 316i.... unfortunatly its proberly a worn camshaft... but not its not to difficult to do..

[murran]

more like a lack of cubic capacity problem??? common fault on 316's btw......