I just recently installed a rebuilt 13bt S4 street ported motor from Rotary Performance, I've got FMIC as well, I've had some Injector issues but those are solved now, Stock ECU and injectors No boost controler. The motor stumbles around 3500 rpm's and will not idle . What am I don or not doing or what should I look for? Can Some one help me please !!!

 

Vacuum leaks?

 

Yes been through all that, cheched and double check all the vacuum lines to make sure there were no leaks. Now the motor did come fully assembled from Rotary performance, and I have had to change the injectors once, also one quick question . the solenoids what is the color order of them? maybe I have them in the wrong sequence and that could be giving me difficulty.

 

Check your vaccum lines. also check the idle mixture (BAC ). I had aproble similar and I adjusted the BAC.

 

When you changed the injectors, did you use new o-rings?

How are your grounds? http://www.aaroncake.net/rx-7/grounding.htm

Can you describe the idle problem exactly? Is it high, low, rough, etc?

I don't know the solenoid order off hand but there is a diagram in the FSM.

 

low idle it wont idle at all. Currently I dont have a FSM but i have downloaded section relavent to my car that have been helping a great deal.

 

also I have checked all the grounds and they all ohm out good, but I cleaned them and made sure all were tight.

 

What were the injector issues and how were they solved?

 

Originaly when the motor was built it had low impeadance injectors in it , my car required High impeadance , I just got the new injectors and will be replacing them here this weekend.