harryb

My 1996 993TT w/ 23000 miles is sounding a bit louder on startup. Nothing major, just a bit more initial rumble. It doesn't sound like the ticking sound of premature valve guide wear or a car needing a valve adjustment, but rather more like a throaty exhaust sound.

I bought the car with 8K miles a year and a half ago....and had Protomotive put in Garrett Hybrid turbos and remap. Between 1996 and 2004 the car mostly sat in the garage of the person I bought it from (next to a couple of Ferraris and

The car is running fine. It is a bit colder these days in my area. Could that explain this?

Harry

Felix

There's an air injection system that runs for 2 minutes on a cold start. According to the service info manual this system runs on cold starts at between -12 and 60 degrees C ambient. It hasn't got to -12 C yet I presume?!

I seem to remember my car sounding different at start-up at altitude (6000 feet) last year at perhaps 3 degrees C, almost like the air injection system wasn't running.

Q

harryb,

perfectly normal.
they always have a louder exhuast note until they warm up

ScottMellor

Yup. On a cold morning mine sounds like somebody kicked a pack of sled dogs awake.

harryb

Thanks everybody....I feel better now (Vroom, Vroom!!!!).

Stummel

It's exactly vice versa. The car does not sound louder on startup but it sounds more quiet after it is warmed up... Buy a muffler bypass and it is even more obvious :-)