i have a 93 CX hatch.. i took off the 8V head and put a 93 DX head on the block with an 88-91 SI intake mani and TB and a VEnom fuel rail..i have intake and exhaust too.. my question is i have an ECU from an auto DX which makes the redline a lil lower than a normal DX 5 spd should be . but i also have a 90-91 LS ECU (pr4) and the redline is 7200 RPMs . will it hurt my engine to run it with this ECU ? all i notice when i put it in is the idle goes up to like 2K .. but maybe i can turn it down with the mani screw?

mike

 

why? i don't think the 90-93 ls ecu will plug into a 93 wireharness....

 

yeah it does i already had it in and it runs ok but it idles at 2K

 

fuel maps on the auto and 5spd are the same. eitehr way you can have it convert it to 5spd i matter of minutes.

90-1 LS ECu will not work, but a 92-3 will work (OBDI). so will 94-5 P75. other choices are the JDM counter parts P54 and P29.

idle is most likely due to a vacum leak or unbled cooling system. check the TB gasket also try to adjust it as well (on the TB there is a screw which can be turned)

 

well how do i convert the auto DX ecu to a 5 SPD ? also the dx ecu idles at like 800rpms.. too low.. but the Pr4 idles at like 2K rpms .. too high.. i tried to turn that screw but its stuck.. so i can just adjust the throttle cable.. but will the pr4 have any beifits in my car?