I have been trying to fix my son's 90 rx7. it runs okay up until about 3000 rpm but bogs down after that. Installed a new intake manifold gasket, fuel filter, replaced all vacuum lines. No trouble codes set. It will go about 30 mph all day long but no faster.

 

Welcome to nopistons! I'm moving this to the 2nd generation specific forum, you should get some helpful answers there!



I'm guessing:

secondary injectors, or

auxiliary port actuators or stuck sleeves

 

Checking your 5th and 6th port system and at the end theres a link to how to fix it:



http://www.aaroncake.net/RX-7/6porttest.htm



And than options for replacing the airpump system with something alot more complicated:



http://www.rotaryresurrection.com/2ndgen/t..._elec6port.html



http://forum.teamfc3s.org/showthread.php?t...ighlight=s5+6pi



https://www.nopistons.com/forums/S5-6PI-act...ing-t72846.html



VDI ACTIVATION VIA SOLENOID!



http://howto.globalvicinity.com/gv_wiki.ph...p;co=1&vi=1