wild rev counter

[Crippo]

Guys just had the head gasket done on the Cosworth, now the rev counter is dancing a merry gig and flips 2000rpm - 5000rpm under acceleration which it never did before.
Also on start up now the revs hold at 1800rpm for maybe 20 seconds before gradually calming down.

Anything obvious I should be looking at?

Much appreciated, thanks

[fergus91]

would say air leak for the idle issues, try spraying each gasket on the intake with WD40 or brake cleaner and see if the engine note / speed changes. if it does then that gasket has gone or the joint is not tight enough

EDIT: also the rev counter fliping between 2 and 5 sounds like the RPM sensor on the engine is on its way out. either that or the rev counter itself

Edited by fergus91 on Friday 21st May 00:39