Runs well at high rpm, terribly at low rpm - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
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post #1 of 3 (permalink) Old 04-20-2019, 10:47 PM Thread Starter
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Runs well at high rpm, terribly at low rpm

Did a 280zx distributor swap and a bit of a carb tube on the round tops on my 73 240z manual transmission. It runs way horribly at low RPM but the best I've gotten it to at high rpm. Is this a sign of too retarded or advanced ignition timing? Also my idle ended up much too high, like 1500rpm cold with no choke after my carb tune, but it runs cetter than I've had it running in a year and a half.

I did not adjust the timing after installing the zx distributor. So it's probably wrong, but I'm not sure if that causes terrible running at low rpm and good running when I flog it. Which way should I adjust timing? Or is this a sign of something else?
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post #2 of 3 (permalink) Old 04-20-2019, 10:49 PM Thread Starter
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Also, this is the oppositeish of my problem with my old distributor. It ran bad at low rpm and even worse under load. So it's a big step in the right direction. I'd just like it to run well across the Rev range.
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post #3 of 3 (permalink) Old 04-21-2019, 12:19 AM
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Vacuum leaks could lead to your high idle. Also, you need to set your timing to 10 degrees per the FSM - after you set it there then start working through other possible causes (if that doesnt fix it).

1978 280z - stock L28 engine - Dallas, TX
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