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Mystery Pipe/tube question

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Old 02-01-2013, 04:54 PM   #1
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Default Mystery Pipe/tube question

Hey guys, so the other day I cut the cats off my 89 f-150 5.0. I was cutting off the cats, and right behind the second cat (resonator maybe) there was a metal tube that was welded into the exhaust....

I cut it off from the exhaust, and never welded it into my new exhaust, it just hangs by it. It looks like it goes up to the back of the motor on the passenger side, but I did not follow it anymore than that.

I was just curious what this tube was, and I do not have pics

PS- I drove the truck a few miles home after I did the exhaust. The next day it was very cold -15 at least. The check engine light stayed on all day. I put oil and antifreeze in so I knew those were good. The truck runs great when the light is on... what would cause this.

Finally the check engine has come on and off for a few years now. It only happens when it is cold (maybe below 30) and only flashes on and off when you acellerate. I thought it was an intake gasket, so I put stop leak in and it still does it. Any ideas? Thanks guys
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Old 02-01-2013, 06:32 PM   #2
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I think it's for the egr valve.
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Old 02-01-2013, 06:53 PM   #3
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I believe that tube feeds back to the air pump. Someone correct me if I'm wrong. As far as the check engine light,anytime you start disconnecting or removing things that are related to emissions it's not unusual to see the light come/stay on. It might feel like it's running fine but you are probably wasting fuel.
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Old 02-01-2013, 07:32 PM   #4
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It's the AIR injection tube...I broke mine while removing it to install headers....got a new tube from rock auto but can't seem to find anyone who sells a weld-in bung for the exhaust side.
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Old 02-01-2013, 08:09 PM   #5
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Sweet, but I don't actually need it do I? I know on my 4.9 I had the local muffler shop put new exhaust on it and he just left it disconnected, I have not had any CEL or performance problems
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Old 02-01-2013, 09:47 PM   #6
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Its the egr tube it goes into the crossover pipe on the back of the heads which is fed cool air from the air pump. Just remove the tube, crossover tube, plug the vacuum line on top and delete the air pump. If your state requires emissions then you must leave that stuff on and replace the the egr tube. It sticks into a rubber tube behind the motor and then welds into the exhaust pipe before the cats but after the 02 sensor. Make sure if you delete the air system to plug the holes on the back of the heads.
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Old 02-01-2013, 10:05 PM   #7
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Originally Posted by snipe1605 View Post
Its the egr tube it goes into the crossover pipe on the back of the heads which is fed cool air from the air pump. Just remove the tube, crossover tube, plug the vacuum line on top and delete the air pump. If your state requires emissions then you must leave that stuff on and replace the the egr tube. It sticks into a rubber tube behind the motor and then welds into the exhaust pipe before the cats but after the 02 sensor. Make sure if you delete the air system to plug the holes on the back of the heads.
No, the EGR connects the lower intake on a 5.0 or the exhaust manifold on a 5.8 (idk about 4.9) to the EGR valve on the upper intake, right behind the throttle body. The piece the OP is refering to is the AIR pipe. If he deleted the cats, I'd just delete the tube too. Unless the truck has two O2's the exhaust mod should have nothing to do with the CEL.
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Old 02-01-2013, 10:07 PM   #8
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No, the EGR connects the lower intake on a 5.0 or the exhaust manifold on a 5.8 (idk about 4.9) to the EGR valve on the upper intake, right behind the throttle body. The piece the OP is refering to is the AIR pipe. If he deleted the cats, I'd just delete the tube too. Unless the truck has two O2's the exhaust mod should have nothing to do with the CEL.
I did delete the cats, how do I delete the tube? where should I block the tube? The truck just has 1 02 sensor.
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Old 02-01-2013, 11:14 PM   #9
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EGR on the 4.9 connects to the rear exhaust manifold.

That is the air injection pipe, and without cats it isn't needed. It also won't cause a check engine light just being disconnected there. Just remove the rest of it. Check for codes.
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Old 02-02-2013, 07:01 PM   #10
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Oh yes your right its the air tube, but to delete the system you need to delete the crossover tube on the back of the heads and delete the air pump. It wont set off the cel but you will get a code for the air system not working. If you dont remove it all you will have an exhaust leak there.

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Old 02-02-2013, 07:18 PM   #11
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Whats the best/easiest way to delete the crossover tube and the AIR pump?
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Old 02-02-2013, 07:26 PM   #12
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Whats the best/easiest way to delete the crossover tube and the AIR pump?
Just unbolt the crossover tube and plug the holes in the back of the heads(old spark plugs work for the holes). For the air pump either you need an air pump delete pulley for a 5.0 mustang or just remove the insides of your pump and leave the bearing.
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Old 02-02-2013, 09:08 PM   #13
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Sweet! I can buy some regular plugs and put them in the holes too right?? And wouldn't I need a bypass pulley for a 5.0, or do I need one for a mustang??
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Old 02-02-2013, 11:28 PM   #14
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Sweet! I can buy some regular plugs and put them in the holes too right?? And wouldn't I need a bypass pulley for a 5.0, or do I need one for a mustang??
They're marketed for mustangs. Only 'off road' vehicles can go without emissions, so the bypass pulley is fit drag cars. You can also go with a shorter belt and remove the smog pulley. I don't remember the length though. You can also take the cross-over pipe off and put a pipe cap where the solenoid threads on, then reinstall the pipe.
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Old 02-03-2013, 12:07 AM   #15
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They're marketed for mustangs. Only 'off road' vehicles can go without emissions, so the bypass pulley is fit drag cars. You can also go with a shorter belt and remove the smog pulley. I don't remember the length though. You can also take the cross-over pipe off and put a pipe cap where the solenoid threads on, then reinstall the pipe.
Alright, so the one from a mustang should bolt right on my truck right, its the same motor....
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Old 02-03-2013, 01:45 AM   #16
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There is no need to delete the crossover tube. The air tube warms the cats at start up and provides o2 to help catylization. The crossover tubes are part of the egr. Defeating the egr will create more emissions and lowered mpg as well as illuminating the cel. Just cut the air tube. It will just pump air into the atmosphere. Or if you want to get creative you can connect it.to an air tank and have your own air compressor. For the cel pull the codes and you will know what is causing the problem.

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Old 02-03-2013, 08:20 AM   #17
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There is no need to delete the crossover tube. The air tube warms the cats at start up and provides o2 to help catylization. The crossover tubes are part of the egr. Defeating the egr will create more emissions and lowered mpg as well as illuminating the cel. Just cut the air tube. It will just pump air into the atmosphere. Or if you want to get creative you can connect it.to an air tank and have your own air compressor. For the cel pull the codes and you will know what is causing the problem.
The crossover pipe and the air tube are connected to the same hose off the smog pump. I traced all of it before I removed it. Also, egr delete doesn't always lower mpg. When I deleted mine due to a rusted-out pipe, my mileage stayed the same or slightly improved. And you're one of the only people on this forum who thinks the emissions are gonna jump enough for one truck to kill us all. And, the air pump don't put out enough pressure to be an effective compressor. Someone on here's tried it before.
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Old 02-03-2013, 01:50 PM   #18
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I know my friend has a supercharged 302 in his mustang and he completely did away with the egr, he gets around 20 mpg and has power like crazy
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Old 02-03-2013, 10:35 PM   #19
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The crossover pipe and the air tube are connected to the same hose off the smog pump. I traced all of it before I removed it. Also, egr delete doesn't always lower mpg. When I deleted mine due to a rusted-out pipe, my mileage stayed the same or slightly improved. And you're one of the only people on this forum who thinks the emissions are gonna jump enough for one truck to kill us all. And, the air pump don't put out enough pressure to be an effective compressor. Someone on here's tried it before.
I'm not saying one truck will make any difference but if everyone on this site who mentioned it deleted their emissions that's easily over half the posters. If that is a representative of the community and F150s are the number one selling truck in the us almost every year, well you can see my point. As for the air pump, if you contain the air and connect a check valve it works just fine for airing tires etc. It won't run an impact but it will work. My auto instructor uses one regularly on his Bronco. You are correct about the crossover, its not part of the egr. The egr has no effect at all on power. It only comes on during partial throttle, no load. Ie during cruise on the highway. During acceleration it is closed. During cruise it displaced air fuel mixture to reduce fuel used, reduce burn temp,( to eliminate NOx ) and eliminate knock and ping allowing for greater spark advance. There is simply no way to use as much fuel when the space is being filled with burned gases. And there is no need for extra power at cruise. There is simply no advantage to removing a properly functioning egr unless you just don't like how it looks. You had no difference because your system was not operating properly due to a rusted tube. I simply don't understand the desire to add pollution with no gain in power or efficiency.

Last edited by Warlockk; 02-03-2013 at 10:38 PM.
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Old 02-03-2013, 10:35 PM
 
 
 
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