i am getting closer on my cayman ls3 swap. i have an issue with the MAP. with engine off i am getting a 180 Kpa reading at sea level.. should be closer to 100. this is preventing me from moving forward and doing the first startup.
could this be a wiring issue? any ideas would be greatly appreciated

 

Defective MAP sensor?? It happens....
Try a new genuine Delco sensor. You never know....

 

this one is brand new.
Would incorrect wiring cause it to read almost 2X high?

 

Try another new one. Brand new sensors can be bad,
Incorrect wiring would more likely cause non-function.

 

Can you verify 0Volt low reference and 5 volt sensor power from PCM ?
Linear 200
Offset 10.33 ?
.
As noted above, lotta Counterfeit/Low quality/ defective parts in the pipeline many "New In Box"

 

Is the MAP scaled correctly in the tune(stock PCM) or is the correct MAP selected(aftermarket ECU.