Took off the carburetors and dismantled them. I soaked all parts in gas to clean them. The next morning I scrubbed each part and dried it thoroughly. I reassembled with new gaskets and new jets. Unfortunately I overtightened the front carb jet and broke it off inside the threading. I was able to drill out the brass remains of the new jet (mostly) and fit a new jet in, but it’s tilted just a little.

I reinstalled the carbs, hooked everything back up and “no go”. The only way I can get the car running is by literally blowing gas from the float chamber into the carbs and having the throttle speed screws all the way screwed in. The car starts and revs way too high. I can get the RPMs down to around 1000, but it start to shudder and then die if I go lower. If I keep it at 1000 and try to rev the engine it dies.

I also see that the chamber on the rear carb is not moving when I rev the engine.

What did I do? Is the rear carb dirty? Do I have a vacuum leak? Obviously I should attempt to find a replacement top to my front float chamber so I can install the jet properly.

Any help is appreciated.

You should fix the jet and then set the floats to the correct height. Goto Zhome.com.

If you dont know the history of the car you should replace the cap,rotor,wires plugs, check the timing. A stock Z should be 5degrees btdc, then you should tune the carbs (after you fix them).

Edited June 7, 201113 yr by 71Nissan240Z