What happens when your pressure sensor dies?

 

you lose pressure ... no im not exactly sure but i would think it would mess up the way the ecu runs the car because it is one of the 5 important engine monitors... i know when my afm went out... another one of the 5 i had no spark because it took out my ecu with it... dont know if that would happen with the pressure sensor... however if you did ground a greenish wire then your ecu is toast

 

if your pressure sensor dies, the ecu just sets the pressure signal to default (i think its like -760mmhg?)

 

soo... that does something to your A/F... or nothing at all?

 

both. the ecu doesnt advance/retard timing or add/subtract fuel based on a pressure signal cause there is only the one default pressure signal

 

On a NA it's not so bad because the default reading equates to the manifold pressure seen at full throttle (760mmHg absolute, or atmospheric pressure). Some part-throttle performance might be lost as the ignition would be retarded more than usual. On a Turbo it's more serious as the ignition is not being retarded any more as boost increases. This will increase the chances of detonation occuring under load, particularly if it's a hot day and/or the intercooler is heat-soaked. Don't romp on it until it's fixed.

 

im pretty sure if you just unplug it then your secondaries run constantly when your above 3800 instead of only when your on the throttle. im not positive but i know that when i unplug mine there is no 3800 hesitation but i get like 5 mpg