Breakzero Posted July 30, 2018 Share Posted July 30, 2018 Hi. Greetings from the UK and a new proud S30 owner. I have just picked up my first z car a 240z with L28 engine running the earlier twin SU carbs. The car hasn't run much in a few years but seems mechanically sound. Driving the car back 200 miles the car ran fine for 100 odd miles. Then started to develop a bogging issue. Loss of throttle. No power at all. Ended up getting the car recovered home. Now the car starts fine and idles sweet enough. But I still have this bogging issue, after running the car up to temp and driving maybe 10 minutes or more it appears. Where should I start to look? I've cleaned out the pistons In the carbs and put new damper fluid in. I've also bought a colourtune kit and carb balancer and will change the plugs too. Could these things be the problem? Thanks. Quote Link to comment Share on other sites More sharing options...
30 ounce Posted July 30, 2018 Share Posted July 30, 2018 Fuel filter? Quote Link to comment Share on other sites More sharing options...
juxsa Posted July 30, 2018 Share Posted July 30, 2018 My money is going to be fuel percolation. The carbs are getting hot and fuel in the carbs is boiling in the bowls Quote Link to comment Share on other sites More sharing options...
Breakzero Posted July 30, 2018 Author Share Posted July 30, 2018 Thanks guys. Fuel filter looks good. Yes this was also suggested regarding the fuel percolation. How do you fix this juxsa? Any ideas buddy. Is this a common issue regarding the L28 when running the carbs instead of EFI? Quote Link to comment Share on other sites More sharing options...
Miles Posted July 30, 2018 Share Posted July 30, 2018 Go to the Ztherapy web site. Open the Videos link and buy the video ZTV09 "just SUs" http://www.ztherapy.com/ The video explains how SU carbs work and how to repair and tune them properly. You must understand how SU carbs work in order to troubleshoot and tune them. Watch the video several times until you understand how the SU works and the tuning procedures. Also, there are dozens of "How To" tune/repair SU carbs write ups on the internet. Study the video. All of the answers are there. Quote Link to comment Share on other sites More sharing options...
Breakzero Posted July 30, 2018 Author Share Posted July 30, 2018 Ok thanks Miles. Great. I am aware that I need to learn this info and am a bit of a sucker for trying to do things correctly. So had been looking on the internet and found this link: https://www.z-car.com/blog/cars/tuning-su-carburetors However if you think it's 100% related to the carbs I'd quite happily buy the videos from ztherapy if they are that good and will help me maintain my car correctly and get it running well. Quote Link to comment Share on other sites More sharing options...
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