Identify this part - fuel system?

[scot850]

Sounds like you have a failing thermostat or as you said it is stuck open. Does the P2 have an ECT/coolant sensor. That would be the other option.

Neil.

[jonesg]

Thanks! that's reassuring. Another thing, which may not be so important, is that it takes about 10 minutes of driving before the engine temp gauge gets to half way to normal operating. That's today at 33 degrees. Maybe the thermostat is stuck open? the quicker the engine reaches normal operating temps, the better.

check that the engine cooling fan isn't running when engine is cold,
that will prevent engine from fully warming up.
i just fixed the same problem on mine, the coolant temp sensor was dead,

[weitau]

You guys are the best! Time to check the brake vacuum and cooling fan.

[weitau]

Thanks! that's reassuring. Another thing, which may not be so important, is that it takes about 10 minutes of driving before the engine temp gauge gets to half way to normal operating. That's today at 33 degrees. Maybe the thermostat is stuck open? the quicker the engine reaches normal operating temps, the better.

check that the engine cooling fan isn't running when engine is cold,
that will prevent engine from fully warming up.
i just fixed the same problem on mine, the coolant temp sensor was dead,

Wow yes my fan is running as soon as the engine starts so looks like coolant temperature sensor. Is the sensor right next to the thermostat in that assembly?

[weitau]

It's also worth checking the vacuum pump is working as they are a common failure.

Turn key to position 2 (ignition on but engine off) press the brake pedal a few times and the vacuum pump should start up and build a vacuum in the brake system and stop once the system has sufficient vacuum. If no sound from the pump check fuse number 33 under the steering column (20amp) and fuse number 3 in the engine bay (15amp). It is possible to jump the pins on the brown plug with a fused jump wire to check the vacuum pump is operating.

I did what you said and actually as soon as I turn on the ignition to number two there's a high-pitched whining sound coming from the engine. Is that what I'm looking for? Even before the engine is started the brake pedal feels really hard. Now that the engine is running and idling the pedal is softer. Thanks again!

[P80GLT]

The sound you should hear is that is that of an electric motor running. It should only run for a few seconds then turn off as the vacuum pressure builds up, if you then press the brake pedal it should start running again until the vacuum pressure has built up again

This is my vacuum pump operating by pressing the brake pedal, every time I press the pedal the pump turns on

[jonesg]

Thanks! that's reassuring. Another thing, which may not be so important, is that it takes about 10 minutes of driving before the engine temp gauge gets to half way to normal operating. That's today at 33 degrees. Maybe the thermostat is stuck open? the quicker the engine reaches normal operating temps, the better.

check that the engine cooling fan isn't running when engine is cold,
that will prevent engine from fully warming up.
i just fixed the same problem on mine, the coolant temp sensor was dead,

Wow yes my fan is running as soon as the engine starts so looks like coolant temperature sensor. Is the sensor right next to the thermostat in that assembly?

yeh, thats it, the computer isn't getting a signal so it defaults to over heating engine and turns the fan on.
you can unplug the cooling fan until you get a sensor otherwise the engine will cold.

You need a deep 18mm socket, chrome not impact.

drain 1 gal of coolant via the petcock on the bottom of the rad.
re-use the copper washer if it doesn't come with the new part, just flip it over. 20 minute repair.

[weitau]

The sound you should hear is that is that of an electric motor running. It should only run for a few seconds then turn off as the vacuum pressure builds up, if you then press the brake pedal it should start running again until the vacuum pressure has built up again

This is my vacuum pump operating by pressing the brake pedal, every time I press the pedal the pump turns on

Yes! that is the same sound that I hear. Except it's constantly running, not pausing as in your video. The brake pedal is stiff (with engine off), but since the pump is not pausing, I'm guessing there might be a small leak somewhere. Thanks!

[weitau]

yeh, thats it, the computer isn't getting a signal so it defaults to over heating engine and turns the fan on.
you can unplug the cooling fan until you get a sensor otherwise the engine will cold.

You need a deep 18mm socket, chrome not impact.

drain 1 gal of coolant via the petcock on the bottom of the rad.
re-use the copper washer if it doesn't come with the new part, just flip it over. 20 minute repair.

Sounds easy enough. I've replaced a screw-type clamp with a tension spring clamp on a lower radiator hose only because the radiator inlet wass made out of plastic, and I'm anal.

I'll need to take a look at the nut. I don't have deep socket set, nor a torx one. Hopefully one of these days, we'll get temps into the 50's and I can work on it without freezing my fingers off. Thanks!

[jonesg]

torx is only needed for the small front plastic cam cover. i think it was 27mm.

you're saving $150 diy so buying a couple of tools is reasonable.
i got this set,

https://www.amazon.com/Eastwood-Drive-M ... merReviews