Hey guys I've got an FD I"m trying to fix. The motor starts fine and runs perfect when in vacum but once you get into the boost literally 1 psi the motor falls FLAT on it's face. I think a 85 jeep cherokee with a knocking rod would beat it in a straight line. I've checked voltage at the tps I've even gone as far as switching the ecu from my friends FD. Still does the exact same thing. Any answers?

 

check to make sure all your vacuum lines are intact. that happened to me at one point and when i popped the hood, i found one of my vacuum lines was off.

 

i had this problem this week actually

check the map sensor vacuum signal as well as try swapping out another map sensor (it takes a single 10mm bolt and plug in the vacuum hose and electrical plug...literally a 5min test)

also disconnect the battery and unplug all the ecu plugs and plug them back in and reconnect the battery, this is what fixed my problem

 

That was the first thing I checked! I took the intake manifold off and ziptied them back on!

I'll swap the MAP sensor from my friends FD and check the vacum. Thanks.

 

damn, well, sorry i couldn't help

 

You are in limp mode. Is the car non-sequential or simplified sequential? If you dont have the proper resistors in place it will do this every time. Im sure you have ran the codes also, correct?