pugster Posted November 15, 2020 Share Posted November 15, 2020 Hey all, I couldn't seem to get my YFA auto choke to work properly(300ci). Thinking it was the carb I got a reman and slapped it in. Same issue. The auto choke won't move the choke once the engine has warmed up. I do know I need to install a fan shroud, and I even made a heat shield to block cold air from cooling the hard line. I even moved the line closer to the exhaust manifold to get it to heat up more. Now the other thing is the vacuum lines. The EGR system is no longer in play. In fact almost all vacuum lines are not in play. (Got the truck like this). I have a line to the HEI style distributor, and the brake booster. I need help getting the carb running correctly. Anyone have advice on where to start? Link to comment Share on other sites More sharing options...
old55pete Posted November 15, 2020 Share Posted November 15, 2020 How about a picture or pictures of what you do have to give the rest of us see what is there and not there. On the choke, with the engine stone cold, did you loosen the three screws that hold the black cap in place then hit the throttle all the way to the floor, then take an 1/8 drill bit between the throat and the choke butterfly and turn the black cap until the drill bit will slide between them? Link to comment Share on other sites More sharing options...
pugster Posted November 15, 2020 Author Share Posted November 15, 2020 How about a picture or pictures of what you do have to give the rest of us see what is there and not there. On the choke, with the engine stone cold, did you loosen the three screws that hold the black cap in place then hit the throttle all the way to the floor, then take an 1/8 drill bit between the throat and the choke butterfly and turn the black cap until the drill bit will slide between them? I did not use the drill bit, I only made sure the choke butterfly would close and adjusted the spring to be just touching the arm. As far as pictures, I'll hit that up tomorrow. I do know that this is a hodge podge of parts. I will eventually have my spare block purpose built without all of the stock vacuum/electrical system. Right now I'm just trying to get this set up working as best it can so I can drive it up to NY here in a few months. Link to comment Share on other sites More sharing options...
pugster Posted November 15, 2020 Author Share Posted November 15, 2020 I did not use the drill bit, I only made sure the choke butterfly would close and adjusted the spring to be just touching the arm. As far as pictures, I'll hit that up tomorrow. I do know that this is a hodge podge of parts. I will eventually have my spare block purpose built without all of the stock vacuum/electrical system. Right now I'm just trying to get this set up working as best it can so I can drive it up to NY here in a few months. To further explain, the AC system is gutted. No smog pump and the EGR valve is plugged (I just found that out). The wires for the electrical feedback are all melted so I assume this isn't the correct carb for this truck. The distributor wasn't getting the command to advance the timing so I installed an HEI style distributor. Again just trying to get this carb working as best it can until I save the money to build the engine the way I want. Link to comment Share on other sites More sharing options...
FuzzFace2 Posted November 16, 2020 Share Posted November 16, 2020 To further explain, the AC system is gutted. No smog pump and the EGR valve is plugged (I just found that out). The wires for the electrical feedback are all melted so I assume this isn't the correct carb for this truck. The distributor wasn't getting the command to advance the timing so I installed an HEI style distributor. Again just trying to get this carb working as best it can until I save the money to build the engine the way I want. Ok so we are dealing with a 300 six motor and from the sounds of it you have done away with the feed back system with the HEI dist, and non-feed back YFA carb so we can get this thing to run good for you. It also sounds like the choke may not be opening for you when the motor heats up, am I right? If so yes a picture or more would be nice but lets see if I cant help a little. As said try and adjust the choke so a 1/8" drill bit will fit between the butterfly and carb body. You do have the choke fresh air tube & hot air tube going to the carb? The fresh air comes from a nipple near the top of the carb opening. Copper tube with the rubber hose is the fresh air nipple. It then goes down to the bottom of the exh. manifold then out the top. Coat hanger is in the bottom & top where the tubes should be. The hot air side comes out the top and should have an insulating sleve on it going to the carb choke housing. If your steel tubes are rusted Dorman makes a kit to fix this less the copper tubing. Now also know the choke also has an electric hook up from the ALT "S" lug. You can see this wire in the first picture of the fresh air tube hook up. This supplies about 6 volts and you need BOTH the hot air & this electric for the choke to work right. Dave ---- Link to comment Share on other sites More sharing options...
FuzzFace2 Posted November 16, 2020 Share Posted November 16, 2020 Ok so we are dealing with a 300 six motor and from the sounds of it you have done away with the feed back system with the HEI dist, and non-feed back YFA carb so we can get this thing to run good for you. It also sounds like the choke may not be opening for you when the motor heats up, am I right? If so yes a picture or more would be nice but lets see if I cant help a little. As said try and adjust the choke so a 1/8" drill bit will fit between the butterfly and carb body. You do have the choke fresh air tube & hot air tube going to the carb? The fresh air comes from a nipple near the top of the carb opening. Copper tube with the rubber hose is the fresh air nipple. It then goes down to the bottom of the exh. manifold then out the top. Coat hanger is in the bottom & top where the tubes should be. The hot air side comes out the top and should have an insulating sleve on it going to the carb choke housing. If your steel tubes are rusted Dorman makes a kit to fix this less the copper tubing. Now also know the choke also has an electric hook up from the ALT "S" lug. You can see this wire in the first picture of the fresh air tube hook up. This supplies about 6 volts and you need BOTH the hot air & this electric for the choke to work right. Dave ---- I should point out that I am running EFI exh. manifolds and they do not have a way to run a hot air choke setup so I took the copper tubing and wrapped it around a manifold for heat. It works pretty good so far I just need to adjust the fast idle speed up just a bit. Dave ---- Link to comment Share on other sites More sharing options...
old55pete Posted November 16, 2020 Share Posted November 16, 2020 I should point out that I am running EFI exh. manifolds and they do not have a way to run a hot air choke setup so I took the copper tubing and wrapped it around a manifold for heat. It works pretty good so far I just need to adjust the fast idle speed up just a bit. Dave ---- Thanks Dave, thats why I was asking for pictures to see what he had and dident have. You covered it pretty well. He is in good hands now with you on the case. Link to comment Share on other sites More sharing options...
FuzzFace2 Posted November 16, 2020 Share Posted November 16, 2020 Thanks Dave, thats why I was asking for pictures to see what he had and dident have. You covered it pretty well. He is in good hands now with you on the case. I had 90% typed up last night and got side tracked Pictures do help a lot Dave ---- Link to comment Share on other sites More sharing options...
pugster Posted November 16, 2020 Author Share Posted November 16, 2020 I had 90% typed up last night and got side tracked Pictures do help a lot Dave ---- Where does that one wire hook up? Also, I may have to go the same route as far as the heat tube. Now what about all the vacuum ports? Will the carb work properly if I just cap them off?🤷🏼♂️ I’ll hit the adjustment this weekend. I’m glad you guys know what the hell your doing. Link to comment Share on other sites More sharing options...
pugster Posted November 16, 2020 Author Share Posted November 16, 2020 I had 90% typed up last night and got side tracked Pictures do help a lot Dave ---- Also, I don’t see any place to plug in a wire on this reman carb...please advise😂🤣 Link to comment Share on other sites More sharing options...
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