Joined
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8 Posts
I have a 74 260z with an L28 that has 240z carbs retrofitted on it. Its a total frankensteins monster and I love it. The only problem is that I'm 17 years old and I don't have a dad to help me fix all the problems with it, so I am going to have to rely on all of the other dads here on the forums lol.
The problem happened right after I sent the rear carb to get repaired; it came back in perfect shape but the dashpot was obviously empty, so I filled it with the recommended 50-20 motor oil. Then upon installing brand new spark plugs, the car fires right up and skyrockets to full throttle indefinitely. I checked the idle screw, it was almost all the way unscrewed. The throttle butterflies were closed on both carbs so they weren't stuck open either.
To test if it was the newly refurbished carb, I took away the fuel and spark from the back 3 pistons and respective carb and let the engine run on the front 3 cylinders for a few moments to check and sure enough, the engine spit and sputtered at its normal low RPM. That leaves the rear, refurbished carb to be the problem.
Do you guys have any ideas as to what could cause this? I suspect maybe a vacuum leak has something to do with it but I'm not entirely sure.
The problem happened right after I sent the rear carb to get repaired; it came back in perfect shape but the dashpot was obviously empty, so I filled it with the recommended 50-20 motor oil. Then upon installing brand new spark plugs, the car fires right up and skyrockets to full throttle indefinitely. I checked the idle screw, it was almost all the way unscrewed. The throttle butterflies were closed on both carbs so they weren't stuck open either.
To test if it was the newly refurbished carb, I took away the fuel and spark from the back 3 pistons and respective carb and let the engine run on the front 3 cylinders for a few moments to check and sure enough, the engine spit and sputtered at its normal low RPM. That leaves the rear, refurbished carb to be the problem.
Do you guys have any ideas as to what could cause this? I suspect maybe a vacuum leak has something to do with it but I'm not entirely sure.