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Big White Dak
Dodge Dakota
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10/16/2003
16:30:23
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 Subject: Hose on Intake
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I have a 1999 318 and I was wondering what the hose that connects to the back of the intake hose is for. I was messing with it last night and I left it unhooked by accident. I drove all the way to work and it seemed to run better. I hooked it back up once I arrived to work because I don't want to damage anything. Any help on this would be great.
Thanks
Nolan
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EBL
Dodge Dakota
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10/16/2003
17:09:06
| RE: Hose on Intake
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You wouldn't be talking about the heater hose would you?
It connects to the intake just behind the radiator hose.
I'm shocked you didn't overheat from loss of coolant!
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Big White Dak
Dodge Dakota
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10/16/2003
17:25:10
| RE: Hose on Intake
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No it is like a vaccum hose or something. You know the tubing for the air cleaner right where it connects to the throttle body. I believe it is some kind of vaccum hose or something. I would really look like a moron if it was a coolant hose.
Thanks
Nolan
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I know
Dodge Dakota
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10/16/2003
17:57:21
| RE: Hose on Intake
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It's the PCV hose (positive crankcase ventilation)
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big white dak
Dodge Dakota
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10/16/2003
18:48:54
| RE: Hose on Intake
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So if it ran better without this hooked up does it mean that I should look into a new PCV valve.
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EBL
Dodge Dakota
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10/17/2003
13:11:32
| RE: Hose on Intake
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The EGR Valve sucks exhaust gasses from the manifold and injects them back into the engine. It cools the engine (the burnt gasses can't burn again... less heat from explosion is created) and effectively makes your engine smaller. Without your EGR working, your engine is filling it's cyls with combustible material.
I'm sure you would throw a code if the EGR was bad.
Actually I'm not even sure you have one. I believe that Dodge got rid of them around 96? Somebody will probably tell me I'm wrong, but I believe the later 5.2's didn't have them.
My 92 has one.
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Yellow99RT
Dodge Dakota
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10/17/2003
13:30:43
| RE: Hose on Intake
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My 5.9 has it, a 99. I had to disconnect for both my cold air istallation and my new valve cover installation. I was wondering what it was too, but found out.
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Walter
Dodge Dakota
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10/17/2003
14:44:49
| RE: Hose on Intake
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The hose you are asking about is part of the PVC set-up. The PCV on the right pulls the gases from the inside of the engine, the hose that hooks up to the air hat and goes to the left valve cover is the supply of fresh air that will circulate through the engine. Why your truck ran better I'm not sure but you need to filter the air that goes into the hose. Some have replaced the hose at the valve cover with a plug-in filter, a new PVC is inexpensive to replace, I would replace it just to be sure,
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Kowalski
Dodge Dakota
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10/17/2003
15:56:00
| RE: Hose on Intake
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Walter's right - its the PCV, not the EGR. You could run slightly better because your not dumping these hot oily fumes into your intake. You could run the hose out of site with a little filter on the end but it would be against polution regs. Not necessarily anything wrong with your PCV valve.
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EBL
Dodge Dakota
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10/17/2003
17:47:14
| RE: Hose on Intake
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I'm not sure where I came up with EGR from... I read PCV but when I went to give you an explanation, EGR came out...
Sorry!
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Demon Dakota
DakotaEnthusiast
10/17/2003
18:29:54
| RE: Hose on Intake
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EGR is the other recirculation method used to help control pollution...
True Dual exhaust and removed third cat
HO Cams & HO Intake
FASTMAN 70mm TB
Autolite 3923 Plugs
TPS @ .76 VDC
IAT Adjuster Mod
Custom tranny VB Mod
Demon long tube headers
Ported/polished heads w/ 1.92" Intake/1.60" Exhaust Valves
One dead stock LSD unit (POS...)
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Rob C
Dodge Dakota
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10/17/2003
20:00:53
|  RE: Hose on Intake
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I'm not sure how your engine ran better with the PCV hose disconnected? The positive crankcase ventilation system help to evacuate the blow-by gases in your crank case that can accumulate during the combustion process where expanding gases get by your piston rings. This will make it more difficult for your pistons to go down if the crank case becomes pressurized. Before 1968 most engines had breathers on the valve covers to vent these gases into the atmosphere. Theorically, the PCV system is one of those pollution control methods that don't hurt performance and may even provide a slight boost. Of course if your PCV system is spewing lots of hot oily gases, you've got other problems. A healthy engine will only have small amounts that shouldn't hinder performance when mixed with cool intake air.
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Kowalski
Dodge Dakota
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10/18/2003
09:01:06
| RE: Hose on Intake
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Rob C - please explain how how dumping hot oily vapors into your intake could "provide a slight boost" to performance. My '68 Barracuda had the valve cover breather you refer to, it was normal for the surrounding area to be an oily mess. Newer system helps pollution, not performance.
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Rob C
Dodge Dakota
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10/18/2003
15:44:03
|  RE: Hose on Intake
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Kowalski did you read all of my post? A healthy engine isn't going to be dumping that much "hot oily vapor" into your intake. I would think keeping pressure from building in your crankcase is more important to performance than introducing a small amount of crankcase vapor to a cold air stream. By the time the crankcase vapor gets into your engine, it's cooled considerably. If you had an oily mess surrounding your breather, you probably had excess blowby.
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Question
Dodge Dakota
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10/19/2003
22:47:50
| RE: Hose on Intake
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After '96 Dodge did cut out the EGR system.
Which way does the PCV vavle flow?
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Walter
Dodge Dakota
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10/20/2003
07:15:40
| RE: Hose on Intake
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A little lesson in auto mechanics, EGR (Exhaust Gas Re-circulating) was invented to help WARM the engine up during cold months. The system works with the temp of the engine, when the temp get to around 180-190 the system secures the vacuum needed to open the EGR. Because of fuel injection we don’t need the EGR anymore. With the PCM the engine knows how much fuel is needed to run until the engine gets to operating temps. The PCV evacuates the explosive gases that build up do to the oil and gas that is used to run. When oil is heated it gives off flammable vapors that can explode, they figured this out years ago but because of not having baffles on the valve covers you got the oil coming out at the earlier breather filters. The PVC helps to separate the solid oil from the vapor so the least amount of oil gets into the intake. This is basic but I hope it helps.
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bigl22
Dodge Dakota
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10/20/2003
08:27:20
| RE: Hose on Intake
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ok young guys-- an IC engine is a pump that works both ways to compress gases-- the gases above the pistons rings get ignited by the spark plug firing-- all engines and mostly older worn ones also blow by gases below the pistons rings into the crankcase area - this builds up pressure and needs to be pressure relieved so that oil seals and gaskets will not be over pressurized and leak-- when engines became higher compression in the late 40's they needed to relieve this pressure-- the older cars used a road draft tube that was a hollow pipe just sticking out of the side of the upper crancase and hanging down into the road draft wind that went under the car as you drove- it created a low pressure vaccuum draft zone that pulled these combustion gases out as you drove-- it didn't work very well at low speeeds in the city-- the next idea was the pcv valve-- it opens under vaccuum and allows these oily gases that are now seeping up thru the oil journals to be pulled into the intake manifold to be burned - helps make the fuel /air mix to be richer for power-- the egr is the same idea except larger-- it tends to pull non-oily gases up and they get burned , but in a low speed use vehicle or an older worn engine it tend to choke up from these gases and deposits being coked up - needs to be cleaned out every year or so -- pcm controlled fuel injection, if good allows the mix to be more precise and eliminates the egr and in some cars the pvc also-- remove the pcv at the valve cover and it runs leaner as it draws in much more air directly into the intake manifold- thru the pcv valve hose- it can show you that you are running way too rich and it can also lean way too far out and burn out a valve from overheating-- get it cleaned and set to run balanced right--
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Kowalski
Dodge Dakota
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10/20/2003
16:44:41
| RE: Hose on Intake
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Yes Rob, I read all your post. I don't believe a PCV gives you a performance gain, if it did you'd see them on high powered dragster motors where thet're going for every gain they can get.
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Rob C
Dodge Dakota
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10/20/2003
19:46:31
|  RE: Hose on Intake
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So I take it that you're saying a '99 318 is practically a dragster motor except it has a PCV system which drastically reduces it's power? Did you get that Big White Dak? According to Kowalski you just need to leave that sucker unhooked for drag night at the track!
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Kowalski
Dodge Dakota
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10/21/2003
16:23:42
| RE: Hose on Intake
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That's not what I said at all. I'm just saying PCV does not increase performance - you claim it can, I say explain how dumping any amount of hot, oily vapor could possibly be benificial - I don't care how little amount of oil it might be, or how much its cooled, there's no performnce boost there. You can't back up what you claimed so now you're slamming people.
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Rob C
Dodge Dakota
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10/23/2003
01:53:46
| RE: Hose on Intake
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Kowalski, did you ride the short bus to school? The only reason you come to this forum is to slam people. When you read something you don't understand, you just go on and on blabbering about it. What I posted was: "Theorically, the PCV system is one of those pollution control methods that don't hurt performance and may even provide a slight boost."
What your "brain" interpreted: "The PCV system is one of those pollution control methods that provides massive horsepower gains by introducing highly volatile crankcase gases into your intake which reburn so violently that it's like a superdupercharger!" Wow, the world must be a really scary place when seen from your point of view!
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