What is this thing?

[TURBO2GO]

This is inside my passenger rear fender with hoses coming off it. Anyone know what this is?

 

[ekhonda87]

Factory turbo?

 

[docjohn]

in the older cars there was a cooling fan there...in yours maybe part of ulev system

 

[Fixit]

This is an air pump. Part of the Pulsed Secondary Air Injection System.

 

[TURBO2GO]

This is an air pump. Part of the Pulsed Secondary Air Injection System.

So what does it do? So all NSX's not have this?

 

[99 rs]

So what does it do? So all NSX's not have this?

Only 2000+ year model ultra low emission vehicles (ULEV) have it. On first start up of your car you should hear a vacuum cleaner sound coming from the quarter panel; it's this pump.

 

[Hrant]

So Dave, there goes your oil cooler option :biggrin:

 

[Fixit]

Pulsed Secondary Air Injection System Description
The air pump system is designed to advance the activation of the catalyst and to reduce the hydrocarbons (HC), carbon
monoxide (CO), and oxides of nitrogen (NOx) in the exhaust gas.
The system operates after the engine starts under the following conditions:
• The engine coolant temperature is between 0°C and 70°C (32°F and 158°F).
• The difference in engine coolant temperature is more than 20°C (36°F) between the time when the engine is started and
when the engine is stopped in the previous driving cycle.
When the engine is started, the air pump runs and sends fresh air to the air control valve. The air control valve allows the
fresh air to flow to the exhaust ports when its diaphragm is pulled by engine vacuum. It gets engine vacuum from the air
control solenoid, which is activated by the ECM. Once the fresh air flows into the exhaust ports near the exhaust valves, it
reacts with the exhaust gases, raising exhaust gas temperatures. This promotes faster warm-up of the catalytic converter.
The system operates for a maximum of 60 seconds, but the running time shortens in relation to the engine coolant temperature
and the intake air temperature. When the system is not operating, the air control solenoid and the air control
valve are closed to prevent exhaust gases from entering the system.

This is from the S/M

 

[manfromplanetx]

I use this noise on my S2000 to know when it is warmed up to pull out of the garage... (when it stops) MPX

 

[TURBO2GO]

Is removing it temporarily going to cause any harm? Anyone know? It's taking up valuable real estate. I will save the part and put it back. So all that is inside the hoses is air?

 

[Senninha]

This may be why same later 02 cars have struggled when fitting high flow CATS as this is not on early NA2's .... before removing it Dave can you not try to disconnect it and see what impact it has on start up and low tthrottle running? If all ok then you have your answer I guess ...

regards, Paul

 

[shawn110975]

if you remove it you will get an error code on the dash.

its honda's way of diluting the exhaust to pass Smog test

- - - Updated - - -

the car will idle and drive the same but everyone hates yellow lights on the cluster lol

 

[TURBO2GO]

if you remove it you will get an error code on the dash.

its honda's way of diluting the exhaust to pass Smog test

- - - Updated - - -

the car will idle and drive the same but everyone hates yellow lights on the cluster lol

Are you saying I will get a cel from the 02 sensor? Or by some other way... Because right now car is on bypass pipes and anti-fouler 02 extenders.

 

[99 rs]

Are you saying I will get a cel from the 02 sensor? Or by some other way... Because right now car is on bypass pipes and anti-fouler 02 extenders.

You will get an error code from the air pump if you disconnect it; not the oxygen sensors.