That way you know you only dealing with the primary side of the carb. Well to start the troubleshooting, I would zip tie the secondary linkage, so it can't open at all. I'm relatively new to the world of carburetors! Any suggestions? I bought a vacuum gauge today and vac appeared to be normal at idle. Float levels are OK and I cannot find a vacuum leak, but that's not to say there isn't one. I've done a bit of troubleshooting, but have had no luck. The vac secondary has not opened at this point, but if I manually move it open a bit, the RPMs will increase, but it starts to backfire. At around the throttle half-open point (I don't have a tach, so I don't know how many RPMs) the engine starts to cough and if I go any further it dies. After cleaning everything and rebuilding / installation, I cranked the jeep and it idled beautifully! I also discovered that one of the Venturi on the secondary side was broken off, so I ordered a replacement "core" from eBay and a new tube and added it to the rebuild. After taking it off, I discovered that the previous owner had removed the fuel transfer tube, effectively reducing the four barrels to two. This is the carb that came with the jeep, but it was running a bit rough, so I decided to rebuild it. Like I said, I'm running a 4160 with vac secondary on a 258 straight six, on a Jeep CJ7. I'm new here, but don't know where else to turn! I'll try to be brief, but I'm having a serious problem with my 4160 after a rebuild.
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