Have a 69 with 225 V6, TH400 and a GM 2 Jet Rochester carb. I haven't had the vehicle that long so I haven't figured out all of it's secrets. I have noticed that it's a little tough to get started. By this I mean you have to keep feeding it gas. You have to pump the pedal 4 or 5 times to get it cranked. I'm in Texas, and it's not cold or anything like that. When I first got it the carb. was belching gas over the top like a geiser. I pulled the top half off the carb and B-12 the heck out of everything and checked the float. I quess the needle had stuck and it was just blowing gas through the vent tube. Anyway, put it back together and it did fine, but still had to pump the heck out of it to get started. Even when the motor was warm you had to feather the accelerator pedal to get it cranked and running. This afternoon I went out to work on the rig and pumped the pedal 4 or 5 times and then when I started cranking, it turned over about twice and then backfired so loud that it rung my ears and sounded like a high powered rifle. Scared the s--t out of me. I checked to see what had blown up, but everything looks fine. Muffler is not bulged, nor did it blow the air cleaner off. I was kind of disgusted so I left it alone. Went back out a little while ago and thought I would try and crank it again. First, I gave it no gas and it just turned over and over with no attempt to fire. Then I pumped the gas 2 or 3 times and still no attempt. Any suggestions would help. Just recently replaced coil, points and condenser. Was running fine except the carb. starting problems. Please help.
Help the New Guy
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Do you have a manual choke or an automatic and is it working properly? The backfire almost sounds like its a little lean,like the accelerator pump is weak as Tom suggested. As for the flooding it's probably due for a rebuild or repacement if your not into rebuilding it yourself.
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It has and automatic choke. The type that has tubing to the passenger side manifold for heat. I think I am going to install a remaufactured carb. with electric choke. What type of adjustments will I get into when installing a new carb.
I had the same problem with my carb. See this post for details.
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It turns out that the P/O replaced the gasket in the top of the carb that covered the float so the float was hitting the gasket when the bowl filled up and the needle valve wouldn't close. Also he installed an electric fuel pump with out a fuel regulator. After I fixed the gasket and adjusted the float while I had the top off. It's stopped the over problem except for last week when I ran out of gas. After I filled back up with gas the valve got stuck open again. When this happens if I clamp the fuel line then turn the engine until it starts and un clamp the line it sets fine. Make sure you change your oil. The first time it happened to me I got a lot of gas in the oil.
As far as the other problems I can't relate. My jeepster starts with out touching the gas pedal but I'm also running an electric fuel pump and HEI ignition. Good luck!
LINK LINK
It turns out that the P/O replaced the gasket in the top of the carb that covered the float so the float was hitting the gasket when the bowl filled up and the needle valve wouldn't close. Also he installed an electric fuel pump with out a fuel regulator. After I fixed the gasket and adjusted the float while I had the top off. It's stopped the over problem except for last week when I ran out of gas. After I filled back up with gas the valve got stuck open again. When this happens if I clamp the fuel line then turn the engine until it starts and un clamp the line it sets fine. Make sure you change your oil. The first time it happened to me I got a lot of gas in the oil.
As far as the other problems I can't relate. My jeepster starts with out touching the gas pedal but I'm also running an electric fuel pump and HEI ignition. Good luck!
OK guys and gals, one last question hopefully for a while. I installed a remanufactured carb. today and the rig fired right up and runs great. The question is I could here a heck of a ticking noise after the engine warmed. I started poking around and determined it was the PCV valve. I pulled the valve out of the valve cover and put my finger over the PCV and the ticking quit. Why is it doing this. Did the backfire that occurred with the old carb. barf the PCV. The PCV valve is hooked up to the center port on the carb. throttle body.
G
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·new guy the next thing i would do is replace the distrbuter with a G M elec. see other posts.....this will make a big differance in starting and preformance. be sure to replace the vacumme advance with adjustable...all the instructions are on this site..j p
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