Hello!
1995 f150 Eddie Bauer scsb
I bought a truck with a bad motor, got a used Jasper unit one off a fleet truck f250.
My truck is a 95, donor was a 95, jasper is f4Te casting.

the engines seems the exact same except the egr system. The Jasper unit has tubes coming from exhaust manifolds, where the old egr system has one coming from the exhaust next to trans.

QUESTION:
Plug exhaust tube and slap Jasper motor in ?
Will it all be good in the hood ??
I attached pics so y’all can see what I’m talking about
any informations is appreciated!

Jasper unit with egr tubes from manifolds

Old egr system

Egr tube from exhaust

Closeup

 

Oh yea motor in question is 351W

 

What you are seeing is the pipework for the Air Injection (smog) pump. I may be incorrect, but the line for the egr valve should come from the lower intake manifold. The pipes you are seeing are not EGR, and the rubber hoses are the giveaway. An EGR pipe is going to be all metal because of the temperatures of the exhaust gas.

 

ah okay I see.
So it’s the smog pump system that’s different

am I okay to run the engine how it is in these pictures? This is how it was off the donor truck, I think I remember the guy said there was a tube missing from the black canister?

as for the tube coming from the exhaust, am I good to cut and weld it shut? Run the new engine as is?





So the black tubes are part of the air injection on this engine?

Makes sense, I took it apart before I really knew what it all was

 

Do you live in a state that requires smog checks? If it were me, I would swap on the exhaust manifolds from the original engine, close up the pipe coming from the cat, and do away with the pump and all.

 

The heavier GVW F250/350 trucks use a different air injection system than the F150/Bronco. If you do not have emission testing in your area you can eliminate the air injection system. Keep the TAB and TAD solenoid electrically connected, but no vacuum. I would retain the EGR system. On the 5.8L engines the EGR tube is attached to the front of the passenger exhaust manifold.

 

Use the exhaust maniforms off of your truck on the new motor
Use the crossover pipe that your truck had on the new Jasper motor
Keep the extra one way valves off the new motor
Those come in handy to make a crank evac system for a hotrod

 

QUESTION:
If you eliminate the air injection and are still running the factory cat are you risking burning up (or clogging?) the factory cat?

 

There is a possibility, but if you keep the engine in tune the likely hood is low IMHO.

 

I do have emission testing in my area. Looking at the truck, it does not appear to have a catalytic converter. I was reading on another thread that the system is used to heat it up. So, I’m not entirely sure what to do haha. When I was buying the truck the guy said it still had it.

Ideally I would like to keep the smog pump stuff, and hopefully pass the emissions test here in my area (CO). If it does not I will probably end up welding in an autozone catalytic converter I can take on/off.

Is this plan reasonable?

 

Was doing some more reading this is from another forum:

“Air injection predates cats. If you have plumbing into your exhaust manifolds, which I believe the 5.8L does, the air is to add oxygen to unspent fuel in the exhaust which has run out of oxygen - the exhaust is hot and, when the extra oxygen is added, it reburns in the exhaust manifold. So it reduces HC.”

so I think I’ll slap the motor in with the smog pump and if it doesn’t pass emissions test in my are I’ll add a removable cat 👍

I’ll plug up the pipe coming from exhaust since I have no cat currently. That thread also mentioned that if the cats are aftermarket there is not need for that pipe
“
#4
@Evan_P
Evan_P , 11-10-2013 05:45 PM
Cargo Master
The system pumps air into the cats on start-up until the cats are up to temperature. If you are using factory cats, leave the system alone as they need the pump to function properly. If you have an aftermarket cat you can remove it.”

seems like more work but hopefully will be worth

 

Depending on what the emissions testing consist of, this might be the best way to go.
In Maryland, my '88 doesn't get emissions tested, but the equipment has to be "present".
I went to an garage with state mechanical inspection certification and asked them what would be required, because the exhaust system is covered in the mechanical inspection.
I went for a "do it one time" approach. When I bought the truck, it had been registered with a historic designation, which meant it didn't have to meet the same requirements as a regular licensed vehicle.
My air pump was still functional but the stock exhaust had been replaced with a fabricated dual pipe system that exited in front of the rear axle.
I ended up buying Walker components, a used diverter valve and two check valves, and put it back to as close to stock as possible.
I could modify it now, but it's all new parts and works properly, so there's no need to.
EDIT: It doesn't look like the Jasper motor heads have provisions for the crossover tube, to be bolted to the back of the heads. If you want to set it up to an original configuration, your probably further ahead to find a combination valve for the air injection system, and reconstruct the Jasper engine emissions system. That's if you find out it's needed for emissions testing.
I don't know if the Y pipe from your truck will fit the dimensions of the exhaust manifold flanges on the Jasper engine.

​​​

 

I am really digging in the cobwebs here, but usually the "smog pump" function was two fold. On vehicles with catalytic converters, when cold the system would pump air into the cat to heat it up to operational temp faster, and then divert the air to the exhaust manifolds to help burn any remaining "fuel" in the exhaust. Newer technology eliminates the need for air being pumped into the cat to get it functioning.

So a question for those more knowledgeable...do the heads on his replacement engine have the ports for AIR injection tubes? If he has to equip the truck with the smog pump, is the manifold mounted pipes the only option, or is there a way he can use the head mounted pipes?

 

I just edited my comment above, because it doesn't look like the Jasper engine heads have the provisions for the crossover tube.
If he decides to reinstall the air injection system, it looks like reconstructing the Jasper engine's air injection system would be the way to go, including the connections to the exhaust manifold.
Actually, on a cold start, the air is injected "upstream" (into the heads or the exhaust manifold), then once the engine warms up, the air is sent to the catalytic converter (downstream).
And apparently "modern" cats don't require air injection but I'm not sure it would damage them.

 

It seems like the jasper exhuast manifolds end up in the same place as the original, so I think we’re good there. I’ll include pics.

Looking at the TB’s, I noticed there was a difference there as well. The jasper intake has two vacuum ports coming from the side of the throttle body where the original TB does not. Is this a f250 thing? Which one should I put on? Does it matter?

As I have no cat, I’m going to run the air pump stuff off the Jasper engine. Close up the tube from the exhaust. I’ll update for anyone in the future lol

As for the emissions, here in Colorado they don't check for emissions equipment, just the sniffer test. Also they check the gas caps (affects emissions somehow)


Jasper TB with two vacuum lines (don’t know what for)

OG TB with no vacuum ports

Jasper exhaust manifold

OG exhaust manifold, pretty similar 🤷‍♂️