After an episode last Fall with a sticking float I decided to rebuild my 35+ year old Rochester prior to this years Summer activities. Everything went well until I tried to run it. It starts fine but will not continue to run. If I play with the throttle I can just keep it running but it eventually stalls out, and spits up through the carb. A single pump on the pedal and it starts but will not keep running. Did I go too high or too low with the float setting - or should I be looking at something else? I've got to take it off and open it up again, but would appreciate some input on my dilema. The car ran fine, with the exception of the sticking float, and this is my 1st attempt on a Qjet. It was rebuilt with a Rochester kit, so everything should be to spec., and I opened the idle screws 2 turns - the suggested initial setting. Thanks for the read, and your advise or help !:TU:
I suspect one of two things... the first being the incorrect air horn gasket or its being incorrectly installed. The fuel makes several turns before reaching the idle screw holes, from the float, it goes to the air horn, than back through the bowl to the throttle body. Leaks anywhere will cause a problem. The second is that the idle passage is blocked, either in the bowl or the airhorn. You might try removing the airhorn and spray carb cleaner through the off-idle and idle passages on both sides. These are the small passages on the inside of each venturi, in the air horn. The fuel level would have to be very low to keep the engine from idling...Did you mess with the throttle valves? Are the bushings on the shaft intact? Dirt could have collected around the bushings, which was removed by the cleaning. Ray
Rochester QJet Ray your second analysis is correct ! The two smaller brass tubes fell out of the air horn assy. on disassembly.I didn't know where they went and mistakenly inserted them in the primary jets around the primary metering rods. (It just looked like the most logical place to put em). I actually disassembled a spare QJet and realized my error immediately - needless to say the carb is functioning properly after I disassembled the rebuild and inserted the brass tubes in their proper position in the air horn. I had just assumed they fell out of the fuel bowl assy. It's the type of mistake you won't make next time. My first attempt at a Rochester 4MV, was well worth the exercise.ou: Thanks very much for your diagnosis Ray !:TU: :beer :bglasses:
