air pump or egr???
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air pump or egr???
i have an 89 f150 with the 300 ci engine and a 5 speed. i noticed that after the first catalytic converter there is a tube going into the exhaust pipe. anyone know what this is and if i can remove it without expecting problems?? thanks.
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Joined: Jul 2004
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From: Easton, Pa.
You should have an air pump on the engine.
This pump system feeds air to the exhaust ports and the cat on a switched basis, that is controlled by the EEC.
To stay legal for inspection you need the system intact, depending on the law in your area.
The air to the cat helps light the cat sooner and get it up to temperature for processing CO, HC and NX emmisions.
Nothing directly to do with the EGR system.
This pump system feeds air to the exhaust ports and the cat on a switched basis, that is controlled by the EEC.
To stay legal for inspection you need the system intact, depending on the law in your area.
The air to the cat helps light the cat sooner and get it up to temperature for processing CO, HC and NX emmisions.
Nothing directly to do with the EGR system.
Last edited by Bluegrass; Mar 10, 2005 at 10:12 PM.
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Joined: Jan 2005
Posts: 130
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From: Dublin, OH
Don't know about your truck particularly, but in general Air Injection Reaction (AIR)pumps exhaust into one of two places, depending on whether warmed up or not, the exhaust manifold close to the head and into the middle of the larger cat. So there will be a tube going from the air pump high up on the exhaust manifolds perhaps at each exhaust port and another that goes into the middle of the larger cat (after the reduction section and before the oxidation section of the cat itself).
Then there is another tube, usually only on one side, that goes from the lower end of the manifold to the EGR valve.
The truck will run pretty much the same with or without the AIR pump. Unlike early AIR pumps, which drew some power all the time, electric AIR pumps don't cost you any power or milage, mostly because the run very little.
Your truck will be much worse off without the EGR. EGR has many benefits to the engine at no cost whatsoever. It makes the cylinders run much cooler, prevents abnormal combustion like detonation and preignition, and by reducing the vacuum created at light (cruise) throttle it can increase gas milage. And you truck is tuned to expect it, so it won't be tuned correctly if it isn't working, especially on speed density trucks.
Mark
Then there is another tube, usually only on one side, that goes from the lower end of the manifold to the EGR valve.
The truck will run pretty much the same with or without the AIR pump. Unlike early AIR pumps, which drew some power all the time, electric AIR pumps don't cost you any power or milage, mostly because the run very little.
Your truck will be much worse off without the EGR. EGR has many benefits to the engine at no cost whatsoever. It makes the cylinders run much cooler, prevents abnormal combustion like detonation and preignition, and by reducing the vacuum created at light (cruise) throttle it can increase gas milage. And you truck is tuned to expect it, so it won't be tuned correctly if it isn't working, especially on speed density trucks.
Mark