Hello everyone,

I was having some misfire issues with my XJR. So I started looking at the fuel and air take systems. While I was looking around, I noticed that there is an open port (looks like something was attached to it at one point in its life).

What does this do? and shouldn't it be plugged in? My understanding is that apart from the opening to take in the air, an air filter box is otherwise sealed.

All help is appreciated

 

The one in question is for the flexible rubber hose that goes to your air injection pump, home of frequent failures and associated P0411 codes. The hole you have labeled for air injection appears to be the test-bed for some previous owner with a brand new holesaw and a keen hankering to use it.... on something..... anything!!!


I think, anyway... when I finish breakfast I'll amble out to the shop and snap a pic with only one of those ports showing.

 

It doesn't do anything and is blocked off with a little yellow cap on my car.

 

Ditto. Mine has a yellow cap over that port as well. The hole marked as air pump is correct.

 

Knight, John, I'll have some of the "coffee" you guys are on this morning!
I have 4 air boxes; 3 '96's and 1 '95. Everyone looks like this:


You do need to cap it, though, as that is a post-filter air path to the engine.

 

I have a early 95 and mine looks like aholbro1s. Mine does not have the open pipe on the top. Or is that the top?

 

Some guy, I spy the remnants of an intake gasket in your pic. You have my heartfelt sympathy....I just completed that task this past week and found it a wholly frustrating and hateful task!


This thread spurs me to think......I should perhaps obtain one of these caps and cap off my '95, as the air pump has been inoperative since purchase. So conceivably I could be drawing "dirty" unfiltered air backwards through the (failed) air-injection system?

 

The Electrolux air pump has a solenoid valve that is electrically operated to only open when the pump motor is powered (4 wires, 2 for motor, 2 for solenoid valve). The valve should be closed if the motor is not powered so there SHOULD not be any exhaust/unfiltered air entering the filter housing from the pump.

If the valve has failed then all bets are off, exhaust could enter but it will need to get past the inline check valve on the steel tubing from the 'B' bank manifold.

bob

 

Thank you everyone for all your help I will just plug the hole somehow.

It is on the bottom of the air filter box, to see it you must remove the entire fox (one 10mm nut to unscrew and a couple of clips to unhook) and turn it 180 degrees.