air injection help
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air injection help
I was wondering if someone could bring me up to speed on a few things about air injection. I just got an 89 f-250 with a 5.8 liter. I relized it had all these metal lines running into the exhaust manifolds so I looked it up to see what it was and it was the air injection. What I'm wondering is I am wanting to beef the engine up with a little more torque and horsepower(mainly torque) Because I may be doing some towing with this truck. So one thing I was going to do is get a set of headers and basically hole new exhaust. I was wondering if I take the air injection off what will that do as far as how the truck runs, is that going to make the engine run bad or mess something up with the computer. I love the truck so far just wanting a little more towing power. If any one has any suggestions it would greatly be appriciated. And if any one has any parts to recomend to gain torque (just bolt ons) let me know thanks guys
Fleet Mechanic
Joined: Mar 2005
Posts: 1,603
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From: St Louis
The AIR injection system is to help burn the unburned fuel from the combustion process. It has three modes of operation for the diverter valves, first during warm up and idle the pump vents to atmosphere. Warm up while driving the air goes to the exhaust at the head either through the port on the back of the head or to the exhaust manifolds to aid warm up. Last the air is diverted to the cat or before the cat once the engine is warm and to keep the O2 sensor from measuring the air from the AIR injection system.
Proformance wise only the air pump itself will cause a loss of power because it is being turned by the engine, i.e. soaking up power from the engine. Your major concern arises in the EPA side of things for your emissions. If you are in California or any state that does emissions inspections, you will automatically fail if the AIR system is removed from the truck and visually not present. So check your local emissions laws before hacking off the system.
Proformance wise only the air pump itself will cause a loss of power because it is being turned by the engine, i.e. soaking up power from the engine. Your major concern arises in the EPA side of things for your emissions. If you are in California or any state that does emissions inspections, you will automatically fail if the AIR system is removed from the truck and visually not present. So check your local emissions laws before hacking off the system.
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I live in the midwest and there arent to many emmisions checks or anything like that here. Never even heard of anyone around here have to get a emissions inspection around here so Im not to worried about that. To take the air injection out is it just as simple as taking all the air injection stuff off and throwing the new exhaust system on or is there more to it then that I appriciate you telling me about it and any help would be great thanks
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
The Thermactor system as it's called has a bunch of parts you'll have to deal with. There are 2 solenoids over by the coil, they have vacuum lines attached that go to a pair of diverter valves behind and beside the motor. You'll have to remove all the plumbing assocoated with this system, remove the vacuum lines between the valves and solenoids and cap the solenoids(but leave them electrically plugged in), and either remove the air pump or just plumb put a short piece of tubing on it so it dumps to atmosphere, that way you don't need another belt. Then drop the whole exhaust and get a set of longtubes and put a single 2.5" system behind it, that'll get you some great TQ increases. The motor will run fine with this system completely removed, there are only problems when it's not completely removed and there are leaks in the portions left upsteam of the O2 sensor that cause the motor to run lean.
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
No, on a stock 5.0 or 5.8 motor anything bigger than a 2.5" single will impact low rpm TQ. Flow increases come from high flow components(headers, cat and muffler), these motors really don't move a lot of air.. the heads are restrictive, so the exhaust really doesn't need to be any larger than stock. Larger pipe just reduces exhaust gas velocity and counteracts the improvements achieved with the high flow parts. The 3" system I have was built with a high performance 5.8 in mind, it's really too much for a 5.0, my old '89 produced more TQ and it had a single 2.5" system.
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