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Hey. I have a 1985 4.9L inline 6 and I have an extremely warped intake and exhaust manifold. I have decided to just buy a brand new manifold and I have found the exhaust manifold on rock auto, but I cannot seem to find the stock single barrel intake manifold anywhere online. My buddy told me that although my truck is fitted with a carb, it is EFI as well. The carb has small injectors in it and uses an EGR valve. I had bought a carbed intake and exhaust manifold on accident and it does not have any of the EGR ports. Does anyone know where I can find one? Possibly a link to one or a part number I could use to search for it?
Here are some pictures of a carburated manifold I bought on accident.
As you can see. The intake manifold is separate from the exhaust manifold on RockAuto's website. If anyone knows of this part, please send word.
Why not take your manifolds to a machine and have them trued up?
Do you need a working EGR? If not then use it and put the EGR valve in place as a spacer and bolt your carb on.
Crap I don't know if that would work? You have a feed back system and it may need to see the EGR valve working to run right.
Now if you are not running a working feedback system then do as I said above and use the valve as a spacer and bolt the non-feed back carb on top of it.
Why not take your manifolds to a machine and have them trued up?
Do you need a working EGR? If not then use it and put the EGR valve in place as a spacer and bolt your carb on.
Crap I don't know if that would work? You have a feed back system and it may need to see the EGR valve working to run right.
Now if you are not running a working feedback system then do as I said above and use the valve as a spacer and bolt the non-feed back carb on top of it.
Yes i do need a working EGR. I live in California so any modifications make it nearly impossible to pass smog. I do have a feedback carb and it requires the egr valve to be working. The intake and exhaust is so warped it is not worth machining them.
My buddy told me that although my truck is fitted with a carb, it is EFI as well. The carb has small injectors in it and uses an EGR valve.
I am doubting this is true. How could it be both carbureted and fuel injected? It is either one or the other. Also, Ford never used throttle body injection in trucks.
What does the EGR valve have to do with the fuel system? I have carbureted vehicles and fuel injected that use an EGR system.
I am doubting this is true. How could it be both carbureted and fuel injected? It is either one or the other. Also, Ford never used throttle body injection in trucks.
What does the EGR valve have to do with the fuel system? I have carbureted vehicles and fuel injected that use an EGR system.
The guy that told me was over simplifying it for me. He knows what he is talking about. He just has to explain it to me, who has very little knowledge of mechanics. I think he was just trying to explain a feedback carb to me. He said the carb has little injectors inside it and they were controlled by the O2 sensors and what not.
I am doubting this is true. How could it be both carbureted and fuel injected? It is either one or the other. Also, Ford never used throttle body injection in trucks.
What does the EGR valve have to do with the fuel system? I have carbureted vehicles and fuel injected that use an EGR system.
What his friend meant was this was Fords first so call try at fuel injection.
The carb does not have an injector but the feedback system controls how much fuel the carb can put into the motor.
It gets it "feed back" from sensors, the big one the O2 and the computer will adjust the mixture thru adjustable jets to maintain the right AF ratio.
So the adjustable just is what might be why he said FI.
The feed back system needs to see the EGR valve position and that it moves / works. If the system does not see it can work the system goes in to limp mode and runs like crap and the MPG goes down.
I have mid 70's cars that I disconnected the EGR but unlike the feedback system had no computer to control any thing. So the EGR did not open to do its job.
Dave ----
Yes i do need a working EGR. I live in California so any modifications make it nearly impossible to pass smog. I do have a feedback carb and it requires the egr valve to be working. The intake and exhaust is so warped it is not worth machining them.
You may not have a choice but to fix yours if you cant find a good one and I would send it out to be trued to be safe.
Originally Posted by cgunning17
The guy that told me was over simplifying it for me. He knows what he is talking about. He just has to explain it to me, who has very little knowledge of mechanics. I think he was just trying to explain a feedback carb to me. He said the carb has little injectors adjustable jets inside it and they were controlled by the O2 sensors and what not.
I was recently told by an auto machinist that buying a new intake and exhaust manifold separate, they will often not fit together properly and there will be a bit of a gap and that it is a better idea to have them machined flat. I am not sure if he was just talking about old, used manifolds, or brand new, straight off the shelf manifolds. I understand that used ones may have warped differently over time. I will have a machinist look at my manifolds and see if he can clean them up.
1977 E100 & F100 except CA emission // 1977 E100 & F100 with M/T & CA emission from serial number Y00,001 // 1978 E100 & F100 with/without CA emission.
1978 E150/250 & F150/250 with CA emission // 1979 E100/250 & F100/250 // 1980 E100/250 & F100/250 & Bronco with CA emission // 1981/83 E100/250 & F100/250 with CA emissions.
You might be able to ream the egr spacer bolt holes and get it to fit this manifold. Manifold (intake) is otherwise the same. Exhaust however, needs o2 sensor bung.
10-16-2018, 03:49 PM
Can't find a new intake manifold
