Join Date: Sep 2013
Location: Preston Hollow
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No Turbo when its COLD
I have had a problem for the past few weeks, when it gets real cold. I am now getting an under-boost and a MAP-barometric correlation DTC when the air temps falls below zero. Sometimes both DTC's and sometimes just and under-boost DCT.
I have no issues when the external temps are above zero. As the temp hits the negative numbers (literally when the temp reads -1) the problems start with no to very little boost (1-3 psi). When I mash the pedal and get to rpm's up the turbo kicks and and starts boosting but with then over-boost, as compared to the pedal position. This seems to get a little worse as the temps go lower.
Separate note, my Edge CTS reads the IAT and bottoms out at zero and will not read negative. Is this a limitation of the CTS or is it a sign of something else wrong?
2005 F350 Lariat Crew-cab Long Box
Upgraded FICM with PHP Hercules tune
Edge Insight with EGT probe and Turbo timer
Diamond Eye 5" Performance exhaust with muffler delete
Blue spring update
High Idle Mod