Fast82930

Been chasing a lean condition on our 75k mile 2003 Boxster S. It started throwing P0171 & P0174 codes so I replaced both forward O2 sensors, didn't fix the lean condition...

Then it started to idle rough and threw misfire codes P0300, P0302, P0303 & P0304. It was time for new plugs so I also installed new coil packs. Ran well for a bit then the rough idle returned, so I started looking for intake manifold leaks. The passenger rear of the intake manifold has a vacuum connection that was 80% torn. I can't seem to find the proper replacement part and many of the pictures I've found show this connection is blocked off.

Pic attached, appreciate any help.

Fast82930

More info... This line doesn't seem to exist on the parts diagrams I've seen. Car has the chicktronic transmission (wife's car) so maybe that's the difference?

Part #6 below is a block off plate with no line connection. On ours the line runs under the manifold and connects to driver side front line #3.

http://www.einmaligparts.com/zoomify...04/pg_0046.jpg

Fast82930

Found the part, #21 Venturi tube.

voiceprint1

did this solve the idle?

Fast82930

All fixed and running great again.

Because of the mileage I went down the ignition parts replacement bunny hole before seriously listening for leaks...