1997 Porsche Boxster died while driving.

[xX2pro4uXx20]

Originally Posted by Stl-986

Did you remove the carpet AND the foam under it or just feel the carpet?

I can take out the foam too if I have too. I filled it up yesterday and it doesn't seem to have lost any coolant since then

[blue62]

The hose in your picture is the coolant overflow hose.
So with the engine overheating the hose is doing what it is supposed to do.
Venting expanding coolant.
The best way to diagnose coolant systems issues is with a coolant system pressure tester.
Harbor Freight has them for reasonable price.

Sounds like either your coolant overflow tank, the bleeder valve or the coolant cap is toast.

Your P0117 code is telling you that the DME/ECU is not getting a signal from the coolant temp. Sensor.

When you do get it started and running at higher RPM does it run smooth or rough????
What is the Lowest RPM you can keep it running at? and how does it run?? smooth or Rough.

Doubtful that it is a fuel pump issue.
If a fuel pump cannot supply enough fuel at low demand=idle... it is very doubtful that it can supply enough fuel at higher demand.
As when you give it gas and it runs.

[xX2pro4uXx20]

Originally Posted by blue62

The hose in your picture is the coolant overflow hose.
So with the engine overheating the hose is doing what it is supposed to do.
Venting expanding coolant.
The best way to diagnose coolant systems issues is with a coolant system pressure tester.
Harbor Freight has them for reasonable price.

Sounds like either your coolant overflow tank, the bleeder valve or the coolant cap is toast.

Your P0117 code is telling you that the DME/ECU is not getting a signal from the coolant temp. Sensor.

When you do get it started and running at higher RPM does it run smooth or rough????
What is the Lowest RPM you can keep it running at? and how does it run?? smooth or Rough.

Doubtful that it is a fuel pump issue.
If a fuel pump cannot supply enough fuel at low demand=idle... it is very doubtful that it can supply enough fuel at higher demand.
As when you give it gas and it runs.

It runs very smooth. The lowest rpm I can keep it at is around 800-1000 and it runs fine there. I was also thinking that maybe it's the idle air control valve? Could it be that?

[blue62]

Originally Posted by xX2pro4uXx20

It runs very smooth. The lowest rpm I can keep it at is around 800-1000 and it runs fine there. I was also thinking that maybe it's the idle air control valve? Could it be that?

Yes it sounds like the Idle Air Control Valve is not working.
The air escaping sound your hearing when the engine dies is most likely air trying to get past the closed throttle plate. That is happening because the IACV is not allowing air past the throttle plate at throttle plate closed position.

But I am just guessing.

You say it runs smooth at around 800-1000 RPM... A vacuum leak big enough to stall the engine at idle would most likely cause rough running at 800-1000 RPM and get smoother the higher the RPM went.

IACV is pretty simple you can do a search here on the forum and find info on cleaning them.
So I would start with the IACV
Lets us know how you go