Re: Damp fish of an engine on S4 Spider
From your post, I am assuming that you know little about the ingnition/fuel system in your car?
Firstly I would find a 'dealer' who was more competent. To suggest that the problem is related to valve bounce (caused by valve springs becoming 'weak' ) indicates that this dealer is staffed by incompetents (aka revenue raisers)... Valve springs on a road car do not loose their properties overnight!
Assuming adjustable, I would suspect the ignition timing is a prime suspect. I know you can produce a car that will not really rev out by adjusting the ignition timing inapropriately.
NB Normaly adjusting the idle mixture will not affect top end performance . I would suspect that you cannot change fuel mixture on this car, except at idle speeds?
Normally, I would first check that all the ignition/fuel components changed are as specified, then I would check all leads are fitted correctly, then check the ignition timing, followed by checking for any air leaks into inlet system
Obviously if this does not find the problem then there are other components faulty that are causing the problem . This would depend on sensors/ MAF? etc fitted to your car which I know nothing about.
Last edited by Stori; 20-08-07 at 23:55.