Gary Lewis Posted September 2, 2020 Share Posted September 2, 2020 Well folks... I don’t know what to say... I got in the truck today and it didn’t want to start. After lots of cranking and throttle it finally lit, but was rough as guts. It wouldn’t idle. It acted like the choke was closed, or a MASSIVE vacuum leak, or like 10* out of time. I checked everything over (several times) and could not find anything. I did a simple substitution and put the old carb back on. It ran just as it did before the carb swap. I swapped the new cab back on, and again it wouldn’t run worth a darn. Something happened. Either my Tom foolery trying to diagnose the blocked port damaged it (carb cleaner?) or something internally is stuck or failed. I think I’m going to contact the seller about a return. I compared the new carb with a couple of my old ones. The vacuum ports on the original units correspond to small pin holes in the base plate. The new one does not have any such ports. Bummer! Usually one or more of the slots is a transfer to help going from idle to off-idle. So not to have a single transfer circuit is odd. And sometimes the vacuum port is the channel in the base of the carb that is at about the 1:00 position in the 2nd pic. That goes nowhere? Link to comment Share on other sites More sharing options...
Ford F834 Posted September 2, 2020 Author Share Posted September 2, 2020 Bummer! Usually one or more of the slots is a transfer to help going from idle to off-idle. So not to have a single transfer circuit is odd. And sometimes the vacuum port is the channel in the base of the carb that is at about the 1:00 position in the 2nd pic. That goes nowhere? Return request is submitted, I will see what the seller wants to do. I would not be entirely opposed to trying a second unit, but if they offer a refund I will probably accept it and try a rebuild kit in one of my OEM units. Gary, one of my factory YF’s had multiple vacuum ports and one of them connected to a channel in the mounting face of the base plate as you describe. I believe it would be nearly equivalent to manifold vacuum. The other vacuum ports connect to tiny pin holes. On the Chinese carb, both channels in the base plate mounting plate have holes that you can squirt carb cleaner into (they are not blocked), but I could not determine where they went. Neither supplied the vacuum barb. I’m bummed that this unit quit out of the blue. Aside from needing to use manifold vacuum for the distributor I was really happy with how it ran... until I was suddenly unhappy 😖 Link to comment Share on other sites More sharing options...
Danny G Posted September 2, 2020 Share Posted September 2, 2020 Yes, filtered air that goes down to the manifold and back to the choke. Okay, this is making sense... although I believe it is usually missing parts on the engines I’ve seen. I’m vaguely remembering a thin tube with an orange silicone hose on the manifold set from the 4x4 donor. **Cough** Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted September 2, 2020 Share Posted September 2, 2020 Well folks... I don’t know what to say... I got in the truck today and it didn’t want to start. After lots of cranking and throttle it finally lit, but was rough as guts. It wouldn’t idle. It acted like the choke was closed, or a MASSIVE vacuum leak, or like 10* out of time. I checked everything over (several times) and could not find anything. I did a simple substitution and put the old carb back on. It ran just as it did before the carb swap. I swapped the new cab back on, and again it wouldn’t run worth a darn. Something happened. Either my Tom foolery trying to diagnose the blocked port damaged it (carb cleaner?) or something internally is stuck or failed. I think I’m going to contact the seller about a return. I compared the new carb with a couple of my old ones. The vacuum ports on the original units correspond to small pin holes in the base plate. The new one does not have any such ports. It's interesting. The throttle shaft in the New carb seems much higher in the bore that the old one. I can see how two of those 'pin holes' sit just above the closed butterfly. But obviously you can't have those holes above the new carb's throttle. So maybe this is another case of 'cargo cult' type impersonation? Link to comment Share on other sites More sharing options...
Ford F834 Posted September 2, 2020 Author Share Posted September 2, 2020 It's interesting. The throttle shaft in the New carb seems much higher in the bore that the old one. I can see how two of those 'pin holes' sit just above the closed butterfly. But obviously you can't have those holes above the new carb's throttle. So maybe this is another case of 'cargo cult' type impersonation? That’s an excellent observation Jim. I believe the pin hole port that connects to the external vacuum barb is the one just below the throttle plate on the OEM carburetor. With so many little differences it does beg the question of what model did they copy exactly? I wonder if it even shares the same internal parts supplied with a general YF rebuild kit? The seller has asked me for the VIN of the truck, a detailed description of the problem, and a photograph of the carburetor. I now await further instructions from eccpp auto. Link to comment Share on other sites More sharing options...
ArdWrknTrk Posted September 2, 2020 Share Posted September 2, 2020 That’s an excellent observation Jim. I believe the pin hole port that connects to the external vacuum barb is the one just below the throttle plate on the OEM carburetor. With so many little differences it does beg the question of what model did they copy exactly? I wonder if it even shares the same internal parts supplied with a general YF rebuild kit? The seller has asked me for the VIN of the truck, a detailed description of the problem, and a photograph of the carburetor. I now await further instructions from eccpp auto. I'd imagine it uses the same parts (gaskets, jets, choke element, whatever..) I'm told I'm pedantic and critical. Mostly I think I'm observant and notice the incongruous. IMO, this must be why you have no ported vacuum. And much like the natives from Vanuatu, while imitation is the sincerest form of flattery, if you don't understand the subtitles of its inner workings, it doesn't really matter how good the replica is (from the outside) Link to comment Share on other sites More sharing options...
FuzzFace2 Posted September 2, 2020 Share Posted September 2, 2020 Could you put some heatshrink or something over the end of that insulation? I could but it is "out of sight out of mind" as it is under the air filter assy. and the hood is closed LOL I need to adjust the fast idle, little to low when I first start it cold. Also have an exh. leak and a suspension rattle in the rear. Should be cooler this weekend and hope to fix all this. Sorry to hear about the carb not working. Don't know why they would need the VIN for a bad carb? I can see a picture or 2 and just what was done up to the point of failure. Dave ---- Link to comment Share on other sites More sharing options...
Rembrant Posted September 2, 2020 Share Posted September 2, 2020 Yes, filtered air that goes down to the manifold and back to the choke. Okay, this is making sense... although I believe it is usually missing parts on the engines I’ve seen. I’m vaguely remembering a thin tube with an orange silicone hose on the manifold set from the 4x4 donor. **Cough** The ‘86 I looked at today still had the tube intact interestingly enough. Link to comment Share on other sites More sharing options...
Ford F834 Posted September 2, 2020 Author Share Posted September 2, 2020 The ‘86 I looked at today still had the tube intact interestingly enough. http://forum.garysgaragemahal.com/file/n73313/E622EF5B-E15E-4575-B60C-2B02438A23E0.jpeg And the desirable non-EGR spacer 🤩 Link to comment Share on other sites More sharing options...
Gary Lewis Posted September 2, 2020 Share Posted September 2, 2020 The ‘86 I looked at today still had the tube intact interestingly enough. http://forum.garysgaragemahal.com/file/n73313/E622EF5B-E15E-4575-B60C-2B02438A23E0.jpeg And the desirable non-EGR spacer 🤩 Two more reasons to buy the truck, Cory! Link to comment Share on other sites More sharing options...
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