Idle Issues without choke

[seerex]

ok its runs great on choke but can't get the car to idle off choke so I can tune the carbs , as soon as I release the choke it idle drops off way too low, and its running very rich from the exhaust , I have the z therapy video but their car idled without the choke on :stupid: appreciate any help Jeff:geek:

[Royce]

Do you have the aircleaner off? If not take it off and look at the bottom of the carbs. I bet that the choke is not releasing the fuel nozzel all the way on one carb. This will cause half the spark plugs to foul and the idle will suffer and exhaust will be black. Reving the engine real hight my seem to make it better.

This could happen if the choke cable (where it attached to the carb) is out of adjustment, the choke linkage is tweaked, or the fuel nozzle is worn. Look ( you may need a mirror to get a good view) specifically at the orientation of the fuel nozzles, black plastic thing that the receives the fuel line from the fuel float. They both should return to the same position every time. The fuel nozzles have a shoulder on the top that should be flush to the bottom of the carb body (actually, I think it is flush to the nozzle adjuster wheel that is attached to the bottom of the carb body). With the car off have someone actuate the choke and watch how each carb works. You can also actuate the chock linkage on the side of the carb by hand. This is a common problem and often can be temporarily fixed by pushing up gently on the bottom of the fuel nozzle that is not returning properly. I had this with my 240Z and I was able to do push the nozzle up by feel with the air cleaner on, not very hard with some practice.

Also, remove and inspect your spark plugs. Most likely three are really black and need to be cleaned or replaced. If all the plugs are fouled than you may need new plugs before you adjust the carbs and your problem could be with the ignition, clogged air filter, or heat range of the spark plug.

Check this out and let us know what you find.

Hope it helps!

[seerex]

i got the bottom of the nozels up flush with the carbs but I can not get the car to idle when warm , it start spitting and sputtering , I just need it to idle so I can adjust them like in z therapy video, its weird when on choke it runs ok very rich but ok , any help would be appreciated

[Daniel]

No doubt the plugs are fouled now. The carb adjust always is the last step of a process.Points and plugs clean and correct ,valves set correct,Timing, and clean pistons in the carb tops. When all those are "yes" then the carb adjust will really bring the car to life. If you have done these things and still cant get idle you may adjust one of the idle screws on the carb to get the car to stay alive long enough to work on it. You may have a vaccum or air leak problem on the intake. Check your hoses for cracks.