fuel cut after fmic install no boost leaks

[godfather75]

I just installed a slowboy racing fmic and now anything past 4lbs of boost I have fuel cut.Brought it in did a leak test and fixed a couple leaks reteted no boost leaks and still fuel cut.Do I need bigger injectors or turn the fuel pressure up.Please help me.

 

[RadDsm]

At only 4psi? I think you may have other issues.

 

[godfather75]

Was able to boost to 15psi with side mount.I didnt change any thing but the fmic. I can get it to about 12psi but stummbles like crazy the whole way until the meth comes on then pulls for a second then fuel cut.

 

[DSMopar]

4 psi? boost leak... or other issue

 

[godfather75]

Do I have to retune the maft translator to compensate for cooler air flow?

 

[TURANO-]

Do I have to retune the maft translator to compensate for cooler air flow?

I had the same problem. Think of it this way, the new FMIC you have flows WAY more than the factory side mount, so with greater airflow you will need more fuel to compensate for it. You need bigger injectors and/or a high flow fuel pump. Also, a tuning tool or ECU flash like ECMlink to lean out the trims,other wise you will run filthy rich. So anytime you introduce more air into an engine, especially a boosted engine, you are allowing a greater amount of air to enter, and will need more fuel with it. Good luck!

 

[steve]

I just installed a slowboy racing fmic and now anything past 4lbs of boost I have fuel cut. Brought it in did a leak test and fixed a couple leaks retested no boost leaks and still fuel cut. Do I need bigger injectors or turn the fuel pressure up. Please help me.

The addition of the FMIC shouldn't have any negative impact. When you finished pressure testing how high did you go and how long did the pressure hold before dropping off?

Your PM said that you also added a MAFT but I don't see any upgraded injectors in your profile. If the MAFT isn't correctly set it can cause fuel cut.

 

[godfather75]

I went to 25 psi it held for about 45 to 60 seconds and gradually dropped.I had the maft set with the side mount and was pulling good.Would upgrading injectors help I have a walbro pump and afr to install just no injectors yet.