I have a 1984 Mazda B2000 I've been driving for about a year now. Now that winter is upon us, I thought I'd rebuild the carb and adjust the choke to make it easier to start in the cold.
I have the carb back together, and I also took off all the EGR and smog stuff (I'm exempt from emissions and it wasn't working anyway). I made a blockoff plate for the intake manifold and I blocked the exhaust fitting off by removing the EGR pipe and putting a nickle in the fitting.
The problem I'm having is that I can't seem to get the carb to tune right. If I were to describe all the symptoms it would probably sound like a vacuum leak...
1.) Won't idle below 1000 rpm
2.) Idles and revs smoothly in neutral
3.) Loses all power above 2000 RPM in gear
4.) Won't run unless the mixture is rich
5.) Won't run unless the choke is almost completely closed, even at operating temp.
The part I don't get is that my vacuum gauge shows 20lbs of vac. I also tested it for vac. leak by spraying starting fluid around the manifold and vac. connections, it didn't seem to effect it any, so I don't think its a vac. leak.
And I thought it might be that the spark isn't advancing, but the timing seems right and it is advancing. I recently replaced the cap, rotors, wires, and plugs, and I gapped the plugs to spec.
I have no idea what my problem might be, I am going to check for fouled plugs tonight, other than that I'm at a loss... it was running OK before I rebuilt the carb, but it didn't want to run right until it warmed up.