Exhaust question

[Friendly_RangerMan]

Hello everybody
I’ve got a question. I’ve got an 87 2.9. There’s a hole or some kind of a port on the passenger side exhaust manifold. It faces towards the front of the truck, it’s kind of aimed at the front passenger tire. It’s been pouring out fumes, you can smell it while you’re driving and it’s made the engine bay/suspension underneath it dirty as hell. Sometimes it leaks oil, I think. What is this for? Am I missing something that’s supposed to attach to it? Can it be plugged?

 

[alwaysFlOoReD]

Please post a pic. Does it have threads?

 

[Friendly_RangerMan]

It does not have threads, it looks as if a fitting might slide over it.

 

[alwaysFlOoReD]

Check under your air filter box and see if there is a similar fitting. On carbs there was a tube to collect heated air from the exhaust to help the engine warm up quicker. Not sure about this, I've never worked on a 2.3.

 

[PetroleumJunkie412]

Warm up tube. Oil is coming from somewhere else.

 

[scotts90ranger]

Warm up tube. Oil is coming from somewhere else.

It's a 2.9L, I believe you mean everywhere else...

 

[PetroleumJunkie412]

It's a 2.9L, I believe you mean everywhere else...

In defense of the 2.9l, the oil leaks likely preserved the tin warm up tube housing.

 

[Bill]

It is possibly the tube carrying air from the air injection (smog pump) is missing. If I remember correctly, there is a bolt that would hold the tube in place with a bracket. The smog pump would be located on the passenger side near the bottom.

 

[scotts90ranger]

Ok, kidding aside PJ is correct, it's the warmup tube that would have originally had a tube running from there to the intake duct from in front of the radiator to the filter box, it had a vacuum operated temperature controlled valve where when it was cold would suck air from around the exhaust manifold to keep the throttle plate from literally icing up.

The oil is likely coming from the valve cover.