1988 Carerra with Euro Varioram 3.6-- motor issues

[p7guru]

Hey,

So I just bought a 3.6 conversion from a fellow Pelicaner and I have a few questions I hope y'all can help with.

1. It seems to backfire and pop a little at low RPMs, during slow shifts and upon shutdown.


2. Their is a hissing sound from the right side of the engine bay. There is some sort of cone air filter in there so it is hard to say if this is the intake because my experience with air cooled 911s is pretty limited. When you shut down the car there is about one second of hiss. I don't know if hiss is the right word. Is that the normal sound of the engine shutting down?


It has a 1997 Euro Varioram engine that was installed by instant G. They chipped it and it has a B&B headders and a McNeil muffler.

It also has a lightweight flywheel.

[kojo911]

There is a vacuum accumulator on the LEFT side of the motor. It should look like an egg crate, some try and get away with a smaller unit. Anyway it stores vacuum to actuate the flaps in the varioram intake. It could be leaking something to check out.

[p7guru]

I have no idea if the Varioram is engaging. The engine pulls pretty hard. I had a Cayman a few years back and the engine feels the same--basically smooth torque--nothing exciting.

I might need to double check all the vacuum lines.