The CEL goes on cause 10-11psi spikes w/manual boost controler. I just got the car tuned yesterday & I want to keep using the mbc cause then I'll be running too rich w/6.5psi regulated internal w/g. Will check valve solve this problem? If so where do they go installed. Thanks in advance.

 

First off, what code are you throwing? Is it the map sensor code? If so, then yes.

 

NO.

What engine management system are you running? that should have been stated as certain ones need to see ALL the boost you are running.

 

where do I mount the check valves? The car won't put on CEL
if boost is below 10 so I figure that's the problem. Where do I mount the check valves & how many do I need?

 

I'm using an apexi vafc.

 

No with that you don't want to use the check valve. It must eb something else. Go to your ecu and find out what cel you are throwing then come back here and ask you quwstion.

 

Try kicking down the boost a couple of notches (like maybe to and you probably won't get that code (don't foget to reset first)

Or just goto the pet supply superstore and get a check valve.

This is my best assumption based on the facts.

 

Just came back from petsupermarket where I bought & installed the check valves in the parking lot. Turned up my manual boost controler a lil bit. Now hitting 14psi for about 7 seconds and then the psi goes down to 10. No CEL on
whatsoever. My vafc was tunned by a pro on a dyno & it's running super smooth. The tunner said yesterday when it was tunned that it would be the ideal thing if it peaked @ 14psi and came down to 10-11 but since I didn't have the check valves installed yesterday the CEL would go on. No CEL anymore, yeehaw!

 

Yay - I had this one pegged all along

 

BE VERY CAREFUL!!! once you put the check valves in conjunction with the afc the afc is not putting out the same amount of fuel for the corresponding boost presure. im runing the same thing so i know. increase your fuel with the afc to about -30 on the hi end and youll be ok. i also recommend a fpr for more fuel.