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New 710 Owner


angel6er

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Recently picked up this 710 coupe. It runs well but I'm currently trying to figure out this issue: When I turn off the motor, it begins to shake. Anybody have any ideas on what it can be? I am thinking maybe the timing is off but not completely sure. Its an L20B with a dogleg 5 speed. Here are a few photos. Also on the lookout for 280zx struts to drop the front a little lol. Any suggestions would be appreciated, thank you

 

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It's common for the L20B to diesel or 'run on' after the ignition is shut off. The stock carb has an idle cut solenoid that shuts off fuel with the ignition being turned off. Easiest thing? Place in 4th or 5th with the brake firmly on, let the clutch up like you're going to drive away and load the engine down, then turn the ignition off and the engine will stall. Once the engine has fully stopped, let the clutch up all the way. Three or four times and you will do it fast and automatically every time you turn the engine off.

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16 minutes ago, datzenmike said:

It's common for the L20B to diesel or 'run on' after the ignition is shut off. The stock carb has an idle cut solenoid that shuts off fuel with the ignition being turned off. Easiest thing? Place in 4th or 5th with the brake firmly on, let the clutch up like you're going to drive away and load the engine down, then turn the ignition off and the engine will stall. Once the engine has fully stopped, let the clutch up all the way. Three or four times and you will do it fast and automatically every time you turn the engine off.

 

Thank you for the tip! I will definitely try this. I was a little worried how the engine would shake after I turned it off lol I appreciate the knowledge thank you!

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You could also try turning the idle down to 700 or so if it isn't. Make sure neither carb is flooding or dripping gas into the intake while running and the idle mixture is not too rich. Spark plugs NGK BPR6ES

 

What year??? Does it have the transistor ignition used on California cars?? Plug gap should be 0.038"-0.042"

 

 

Has the compression been increased??

 

 

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  • 3 weeks later...
On 3/7/2020 at 7:49 PM, datzenmike said:

You could also try turning the idle down to 700 or so if it isn't. Make sure neither carb is flooding or dripping gas into the intake while running and the idle mixture is not too rich. Spark plugs NGK BPR6ES

 

What year??? Does it have the transistor ignition used on California cars?? Plug gap should be 0.038"-0.042"

 

 

Has the compression been increased??

 

 

It'a a 1975 and it does have the transistor ignition. Plug gap is within that range. I used your tip when turning it off and it worked! Thank you again! Now looking for some 280zx front struts to hopefully swap out

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  • 2 weeks later...
On 4/13/2020 at 5:28 PM, shakotan710 said:

Are you trying to upgrade to full coilovers or do you just want stock 280zx struts?

 

 

I'm going to get the weld on t3 coilovers and either get lowering blocks or de arch the springs for the rear

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1 hour ago, angel6er said:

 

 

I'm going to get the weld on t3 coilovers and either get lowering blocks or de arch the springs for the rear

 

Good plan, I'm running a 280zx setup in the front that just needs to be rebuilt and I used to run 3" lowering blocks with 15" wheels. Once I'm focusing on suspension I'll probably go with a minor de-arching and run a slightly smaller lowering block. 

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Finally upgraded to 280zx struts/brakes with the Techno Toy Tuning Weld On Coilover Kit (used clamp collars with a weld under them). Used 3 inch lowering blocks with a 2 degree shim to lower the rears, Got new wheels: River Side Leos, 14x6.5 in the front and 14x7 in the rear. Liking the progress but I was having issues with my carb spitting some fuel. DId some adjustments/cleaned some jets but I feel it still is not running optimally. Next I plan on draining the trans/diff fluid as there is noise in 4th and 5th gears. Anybody have any recommendations on trans and diff fluid?

 

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