348 stutters at roughly 4000rpm

Hi Everyone

I am experiencing the following problem:

My '93 348 has an INTERMITTANT stutter at roughly 4000rpm. This stutter only occurs when the car has been "pushed" (eg. after / during a track day, or in excess of 150mph). If the car is not pushed, the problem will not occur.

Symptoms: The car accelerates fine up to roughly 3800 to 4000rpm, it will then start to stutter. Sometimes, if the stutter is only light, I can accelerate through it and the problem usually goes away. Other times, when the stutter is move severe, I am unable to climb above 4000rpm.

This problem was most noticable at the FOC Oulton Park track day earlier this summer. Halfway through the afternoon session, the car stated to stutter @ 4000rpm and I could do nothing about it. That was the end of my track day and I had to drive almost to Stoke before I was able to get past 4000rpm. As soon as I passed this 4000rpm barrier, the stutter disappeared, until several weeks later when I pushed the car hard again.

Has anyone had this problem?? Does anyone know the cause?? What should I do??

Your advice is very welcome !

Regards,

Chris Seeley
Edenfield, Lancs, UK

 

Thanks guys - will do