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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
This may still be an issue with a vacuum leak on your engine here.If all vacuum hoses were or are checked and found o.k. the fault can be with leaking intake gaskets or carburetor gasket leaking allowing excess air to enter the system.I have also seen brake boosters leak and cause this fault.The pop noise can be a result of excess air in the engine causing a lean running condition.
In some cases this can require a smoke machine to do a smoke test on the engine to locate any hard to see leaks like intake gaskets leaking.I would check/test the engine further to locate any leaks needing repaired.If this is or has been done and found o.k. let me know so we can continue.
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This is a difficult question for me to diagnose myself here.
I will open your question up for others here to see if someone else can assist further on this as there may be others here that may have more info on what to check or do with this issue.I hope you can get this resolved with ease.No need to reply to my last post here unless it is a last resort as it will keep your question locked to me and others will not be able to view it.If you feel you want to continue to work with me on this feel free to reply at any time but keep in mind in some cases it can be difficult to fully diagnose or help repair this without seeing your vehicle.
Hello and welcome to just answer and allowing me to assist you, first may i ask a couple of questions to get a picture of what I'm dealing with. I know you don't think it's a vacuum leak but can uoy put a vacuum gauge on it to read the manifold vacuum ? this can tell a few things such as a lek , timing and or mixture adjustment. even though the carb was rebuilt and or replaced the mixture may be too lean . so can you please get that vacuum reading before we proceed thank you.
when the engine is running it creates a vacuum necessary to draw air and fuel into the combustion chamer and it should be around 20 in/mercury If it is lower or erratic it can give you those systems. you need a good vacuum gauge to read it and hook it up to a manifold port to read it.
I'm getting mixed statements here perhaps a phone session would clarify things
ok the thing that was confusing to me was at one point you said it was running and the other time you said it won't start? what is it can you get it to start even for a short time? Here is a link to effectively checking for that vacuum leak which can be done on any type of engine https://www.youtube.com/watch?v=9CPqbaSgcok also you can hook up a vacuum gauge to any port on the intake that has a tube going to it for that check. Also even though you had the carb rebuilt or replace the idle mixture can still be off and you can adjust that. but first do those checks.
great I'll get back when I read your findings
that would be a good idea , I'll wait for you then.
did you check the idle mixture screws that they are set right? give you a link how to check for vacuumhttps://www.youtube.com/watch?v=9CPqbaSgcok leaks
yOU CAN ALSO PUT YOUR HAND OVER THE CARB MAKING IT WORK LIKE A CHOKE PLATE AND SEE IF YOU CAN RAISE AND LOWER ENGINE SPEED THIS WILL TELL IF THERE IS STILL A LEAK