Engine swap
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Engine swap
I have a 1984 ford full size Bronco with the 4.9l. I recently ordered a remanufactured 4.9l without the 6 hole smog in head above exhuast ports. I was wondering if I can reuse my 84 stock intake and carb on this engine.
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Thanks for the help. I went to the salvage yard today and ordered the efi exhuast manifold so I guess my next question would be what to do with all the emmissions from my 84. I know this subject has been beat to death on here but can I just bolt my carb directly to the intake after removing the original components? I was thinking along the lines of the pictures that AbandonedBronco posted in another thread. https://www.ford-trucks.com/forums/8...ml#post7388945
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From: Gateway to the West
If the new head doesn't have the Thermactor injection manifold ports, there isn't much you can do with it but eliminate it. Unless you have emissions testing, the catalytic converter can be dropped too. (Federal law prohibits the removal of a FUNCTIONING catalytic converter). Removing Thermactor system and catalytic converter eliminates the need for the smog pump, the diverter valve and all associated plumbing. The EGR system, assuming it is still there and intact, should really stay put. Trying to tune even a carburated engine that was designed to have the EGR in place is frequently more troublesome than just leaving it there and working. Its not hurting your performance anyway.
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From: Boise, Idaho
One issue that you may run into is that yours is an '84.
Starting in '84, they started using a computer controlled ignition, which uses signals from your carburetor, emissions, O2, etc. etc to adjust the timing of the engine and regulate fuel mixtures. If you start removing parts of the system, it'll start running poorly and dumping lots of gas (Limp mode).
For this to work well, you'll most likely need a carburetor, distributor, ignition module, and wiring harness from a Duraspark II truck. It isn't too difficult and there are some write-ups floating around.
Starting in '84, they started using a computer controlled ignition, which uses signals from your carburetor, emissions, O2, etc. etc to adjust the timing of the engine and regulate fuel mixtures. If you start removing parts of the system, it'll start running poorly and dumping lots of gas (Limp mode).
For this to work well, you'll most likely need a carburetor, distributor, ignition module, and wiring harness from a Duraspark II truck. It isn't too difficult and there are some write-ups floating around.
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The new head does not have Thermactor injection manifold ports. So I'm assuming this leaves me with the distributor, ignition and wiring harness.
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From: Boise, Idaho
And the carburetor. The feedback carburetor has computer controlled solenoids to adjust its mixtures.
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The only wires coming off of the Carb are for the Electric Choke. So I am going to assume one of the many previous owners changed the carb at one point. It is a Carter Weber with the # 7430S stamped on the side. It looks similar to the carb pictured here but with out the other wires: https://www.ford-trucks.com/forums/9...ml#post8289824
By the way thanks for all the help.
By the way thanks for all the help.
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From: Boise, Idaho
So it doesn't have the cylinders sticking off the sides of it?
Looks more like this?
If so, you're right in that it's a non-feed back carburetor.
Next you'll need to check your ignition. If you still have the computer controlled distributor, I imagine you're lacking in quite a bit of power as it is, since the computer isn't advancing your timing.
Do you have the ignition control module on the driver's side fender? If so, it'll have a couple plugs of wires coming out of it with a harness that goes into the firewall. Then, a couple wires will run from it to the coil, distributor, and a few sensors. If so, someone's done all the work for you, and you already have a DuraSpark II ignition.
Looks more like this?
If so, you're right in that it's a non-feed back carburetor.
Next you'll need to check your ignition. If you still have the computer controlled distributor, I imagine you're lacking in quite a bit of power as it is, since the computer isn't advancing your timing.
Do you have the ignition control module on the driver's side fender? If so, it'll have a couple plugs of wires coming out of it with a harness that goes into the firewall. Then, a couple wires will run from it to the coil, distributor, and a few sensors. If so, someone's done all the work for you, and you already have a DuraSpark II ignition.
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Yes, that is the carb and no there not a Duraspark Ignition system in the vehicle. I am coming the junkyard as we speak. I found several good write ups on the site that take you step by step through the conversion process. Thank you for your help it has saved me a lot of time and frustration.
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So I found a complete DSII system, EFI exhuast manifold now I'm trying to mate the exhaust. I have seen the Walker Y-pipe part # WLK-45166 on summit which isn't too expsensive but can I make the y pipe off a later model Bronco fit on my 84 to save a few dollars.
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AbandonedBronco hopefully one las question. Im not using the feed back carb and I have put the EFI exhuast manifolds on what do I do with EGR spacer now that the original exhaust parts are no longer there.