air intake

[wsweet]

Im looking at installing my cold air intake i got awhile back and had a couple questions. what are the sensors after the throttle body and what is the black little plug in the far right corner of the stock intake. what can be removed cause i am getting a tuned pcm soon and whatever can be deleted id rather do it before the tune

 

[dmanns67]

How is your hot air intake (HAI) set up? Is it long enough to directly connect to the throttle body or do you have to connect it to the intake resonator?

The throttle body has a position sensor (TPS) internal to the throttle body. On your intake tube, running from the filter housing to the intake resonator, with will have an intake air temp (IAT) sensor. Mass air flow (MAF) sensors did not get introduced until 2006.

When you say, "black little plug" are you talking about the plug on the right side of the box that says VORTEC (intake resonator)? If so, that is a vacuum line for the fuel pressure regulator. On my 07 TB that vacuum line is actually capped off.

If you bought an intake specifically for your 03 TB (That reaches to the throttle body), then you will have four ports on the intake tube. One is for the IAT sensor, second will be for the vacuum line for the fuel pressure regulator, third will be on the underside of the intake tube if your TB has air injection, and lastly will be for the crankcase vent hose.

I would lose the stock air box and also lose the intake resonator. I have mine removed and think you get a much better sound out of the engine and exhaust with the resonator removed. If your intake tube is not long enough to connect to the throttle body, that can be resolved with a piece of PVC pipe that is 8" long, 3.5" OD. You will need to pick up a couple extra couplings, hose clamps, barb fittings, and hose. You will have to drill into the PVC to add all of the necessary ports.

Much easier to go with a K&N performance intake. All of the ports, hoses, and fitting are already supplied. Plus the intake tube runs directly to the throttle body so you can delete the intake resonator while you are at it.

In regards to a PCM tune, deleting the intake resonator has no bearing on the tune. The order sheet will ask if you have a performance intake, thats it.

 

[wsweet]

my CAI hooks up to the throttle body just fine. its the sensors that dont hook up 100 percent correctly. (given your info on part/names) the IAT needs to be modded to fit into the intake port. the vacuum line for the fuel pressure is way to short on the CAI along with the crankcase vent hose. so your saying i can just plug the vacuum line for the fuel pressure and be fine?

 

[dmanns67]

my CAI hooks up to the throttle body just fine. its the sensors that dont hook up 100 percent correctly. (given your info on part/names) the IAT needs to be modded to fit into the intake port. the vacuum line for the fuel pressure is way to short on the CAI along with the crankcase vent hose. so your saying i can just plug the vacuum line for the fuel pressure and be fine?

From what I have seen with performance intakes, K&N is the only one who will supply you with all the ports in the intake tube and all the hoses you will need to install the intake. It also comes with a heat shield to go in place of the stock air box. Some guys will "gut" the stock airbox and use that as a heat shield.

You will probably need to hit up a local auto parts store/Lowe's to get the correct size hose to replace the stock hose and fittings. For the crankcase vent hose I used a piece of Goodyear hose 12" long, 1/2" ID. I used a barb fitting to attach the hose to the intake tube.

You WILL need to keep the fuel pressure regulator vacuum line and run it to your intake tube. I was just stating that on my 07 TB, that vacuum line is capped off.

 

[wsweet]

so basically just lengthen the hoses or get longer ones and just hook everything up on the CAI like the stock, remove intake resonator and be done with it.

 

[Purefection]

Build your own intake. Way cheaper than K&N garbage.

 

[dmanns67]

so basically just lengthen the hoses or get longer ones and just hook everything up on the CAI like the stock, remove intake resonator and be done with it.

Yes. If it is hooked up to either the stock intake or intake resonator, you will need to hook it up to the performance intake.

Build your own intake. Way cheaper than K&N garbage.

There are quite a few custom intake build threads on here and TV, which is an option. Some members said that they only spent around $30 to make it. My intake is a hybrid of K&N and a custom intake section which was needed to delete the intake resonator.

I am not a fan of the K&N intake filter, but their intake tubes are a solid design. They supply you with all necessary ports, fittings, hoses, couplings, clamps, and a heat shield. K&N makes the most complete performance intake IMO. It is pricey, but it is all "plug and play". Definitely better quality than anything you will pick up off of EBay. You will be in the same shoes as the OP having to modify the intake tube, buy hoses, fittings, etc.

Volant appears to make a decent performance intake, but I do not have any personal experience with the intake.

 

[Purefection]

Yes. If it is hooked up to either the stock intake or intake resonator, you will need to hook it up to the performance intake.


There are quite a few custom intake build threads on here and TV, which is an option. Some members said that they only spent aeound $30 to make it. My intake is a hybrid of K&N and a custom intake section which was needed to delete the intake.

I am not a fan of the K&N intake filter, but their intake tubes are a solid design. They supply you with all necessary ports, fittings, hoses, couplings, clamps, and a heat shield. K&N makes the most complete performance intake IMO. It is pricey, but it is all "plug and play". Definitely better quality than anything you will pick up off of EBay. You will be in the same shoes as the OP having to modify the intake tube, buy hoses, fittings, etc.

Volant appears to make a decent performance intake, but I do not have any personal experience with the intake.

The crank vent tube doesn't need to be re hooked up to the intake. It can't vent to no where. Although, it is an emissions thing, so if that's a big deal in your area you're best to hook it back to the intake.

 

[dmanns67]

The crank vent tube doesn't need to be re hooked up to the intake. It can't vent to no where. Although, it is an emissions thing, so if that's a big deal in your area you're best to hook it back to the intake.

The crankcase vent tube is not venting to no where. On the stock setup, it vents into the intake resonator as you can see in the pic below. Intake resonator is still apart of the intake system.



Although, I have seen members use a mini K&N type filter and use a hose clamp to secure the filter to the vent hole. That is just venting into the engine bay and into the atmosphere. The stock intake is setup that way, which is why I ran the hose from the crankcase vent to the intake tube.



Other than emissions, I do not know of any cons with adding a small filter on top of the vent. That would be one less modification the OP would have to do to his intake tube.

 

[Purefection]

The crank case vent goes to the stock air intake and the engine burns off the blow off gases and passes through the Cats and what not creating "clean" emissions. Having it vent to nowhere will not create any issues other than "dirty" gases being expelled into the environment.

By having it not vent into the air intake you will notice your throttle body will not get as dirty either. Any oil in your intake system is coming from that vent tube.

 

[808_LS_EXT]

Actually, air does not travel out from that port on the valve cover, it travels in.
That is the crankcase vent... basically designed to replenish volume that the PCV valve is drawing out.
If you block that port, your PCV system will not function and damaging vapors will be trapped in your crankcase.

 

[808_LS_EXT]

To prove my case, I ran out and photographed a quick demo for you guys.

I rigged a vacuum gauge to that port.... 1st pic is @ 0

Then ran engine at idle for about 30 seconds... 2nd pic is @ 14
If I ran it long enough, the reading would have reached intake vacuum which is about 22 @ idle.

Those readings indicate that the PCV system is functioning
and also indicates that my valve cover gasket, oil cap seal and oil pan gasket are sealing well.

 

[808_LS_EXT]

By having it not vent into the air intake you will notice your throttle body will not get as dirty either. Any oil in your intake system is coming from that vent tube.

IF oil is traveling out of that port,
THEN either your PCV valve is not functioning properly
OR your piston rings are worn and causing more blow-by than your PCV system is designed to draw out.

 

[Purefection]

Sorry, you are right. That is the clean air port. I still don't have it connected to the intake lol

 

[808_LS_EXT]

Sorry, you are right. That is the clean air port. I still don't have it connected to the intake lol

LOL...

The drawback to not having that connected is if you drive in dusty/gritty environment, you could be drawing grit into your oil... ie, sand/salt near coast and grit from gravel/dirt roads.

You could easliy protect your oil with one of these clamp on breather filters...

 

[dmanns67]

To prove my case, I ran out and photographed a quick demo for you guys.

I rigged a vacuum gauge to that port.... 1st pic is @ 0

Then ran engine at idle for about 30 seconds... 2nd pic is @ 14
If I ran it long enough, the reading would have reached intake vacuum which is about 22 @ idle.

Those readings indicate that the PCV system is functioning
and also indicates that my valve cover gasket, oil cap seal and oil pan gasket are sealing well.

Appreciate the demo That makes sense. I have removed my intake section (which is white PVC) and hose running from the intake to the crankcase vent and they are as clean as the day I installed them. I would personally just run the hose from the vent to the intake and call it a day.

 

[808_LS_EXT]

I would personally just run the hose from the vent to the intake and call it a day.

bada bing, bada boom!

However, some CAI tubes do not have a provision for it... hence the (ricer) filter.

 

[smt 59]

My research has found that K&N is the best wet system for our trucks and Volant for a dry system. Dave I agree that K&N is the most solid with the polished aluminum tube and all the factory ports.

 

[Purefection]

Thanks to this post I found a K&N breather filter for that vent tube at Canadian Tire for 7$. I really don't know why I thought that was the exit, I knew it was an intake Lol.