240z low power cuts out

Alan2fast · September 9, 2015

Ok guys still new here as you guys probably seen just got my 73 240z running but when i give it gas to fast it wants to choke out and almost die and back fires out of the front carburetor. Carburetor were just fully built. Since the frist start i let it run for 15min in idle then reved the motor up and did fine so i took it for a drive and it was hard to get power unless i slowly give it gas then its good after and when i turn the car off the motor shakes hard feels like it wonts to stay on still

Alan2fast · September 9, 2015

Here is a short video

siteunseen · September 9, 2015

After rebuilding the carbs you'll have to fine tune the adjustments. Here's a helpful write up from member Blue, if they are SUs.

http://www.classiczcars.com/topic/39221-quick-and-dirty-su-tuning/

Hope that'll help.

You'll have to upload the video to youtube then link it here.

rossiz · September 9, 2015

blue's info is excellent.

if you're running su's, it is a fairly straightforward process.

be sure you have adequate fuel supply to the carbs (pump, filters) then number 1 above all is float levels - get 'em right, or you'll chase your tail w/the other adjustments.

beermanpete · September 9, 2015

Make sure you have oil in vacuum piston dampers. There is an endless debate on what oil to use but 10W30 is a good place to start.

Alan2fast · September 9, 2015

Thanks guys blues info lookes good ill get right to it and as far as the damper oil 10w30 what type of oil are we talking im runing 3in1