How come after 8 years im still pulling plugs after they get fouled from 30 mins at idle either on traffic or at the shop? Been struggling with this and nothing.

So it's our fault?

I've been following your struggle for all of those eight years.  If I remember correctly, the person who sold you the car has a less than stellar reputation.  You might be stuck with the problem until you have the engine and carbs rebuilt by a reputable shop.

I called him and he said the engine was reconstucted perfectly. 

4 minutes ago, jalexquijano said:

I called him and he said the engine was reconstucted perfectly. 

What else do you think he would say? We are talking about California Datsun right?

He even sold me the valve seals and told me that wasnt necessary. Car has good compression. I guess there is a piece of the puzzle we are missing.

13 minutes ago, jalexquijano said:

I called him and he said the engine was reconstucted perfectly. 

Clearly, it was not or you wouldn't have been struggling with this issue for the eight years you've owned the car.  It's a hard pill to swallow, but having the engine and carbs rebuilt or selling the Z and starting over with another one may be the best solution.  You've fought a long hard battle with your current Z.

So you are of the opinion that those plugs should not foul black as shown even if the car is sitting in traffic for 20 to 45 mins?

The carbs were remanufactured by z therapy in 2014. I invested in this.

Do some research on the carbs. Find a jet kit for them and start dropping the jet sizes. You are way too rich. What are the carbs?

What year of car?

Edited November 20, 20222 yr by kickstand80

9 minutes ago, jalexquijano said:

So you are of the opinion that those plugs should not foul black as shown even if the car is sitting in traffic for 20 to 45 mins?

I have to ask, Why do you let it idle instead of turning it off? Trouble restarting when it's hot? It's obviously too rich. The most common problems, aside from float levels, are stiff nozzle hoses, misaligned nozzle choke linkage or misadjusted choke cables. All of these can prevent the nozzles from raising up all the way when the choke knob is pushed into the off position. How many turns down are the nozzles?

29 minutes ago, kickstand80 said:

Do some research on the carbs. Find a jet kit for them and start dropping the jet sizes. You are way too rich. What are the carbs?

What year of car?

72 240z with stock su 3 screws carbs reman by z therapy