Device on back of intake manifold

[Hagar1]

On the 2012 5.7, there is some sort of device on the back of the intake manifold. It has an electrical connector on it. What is the device, and what does it do?

 

[1999 White C5 Coupe]

On the 2012 5.7, there is some sort of device on the back of the intake manifold. It has an electrical connector on it. What is the device, and what does it do?

Posting a photograph may get a quick answer?

 

[Wild one]

On the 2012 5.7, there is some sort of device on the back of the intake manifold. It has an electrical connector on it. What is the device, and what does it do?

There's 2 devices,one is the "Map" sensor which faces up and is towards the pass side of the intake,the other 1 is for the SRV / Short Runner Valve and is more towards the middle of the manifold. I'm guessing you might be referring to the SRV,it switches the manifold from long runners to short runners roughly about 4800/4900 rpm. Your truck has what's commonly referred to as a "dual" runner intake manifold,and the SRV controls the flap inside the manifold that switches it from long to short runners. The truck utilizes the long runners down low in the rpm band to create torque,and then switches to short runners to promote higher rpm horsepower

 

[Hagar1]

There's 2 devices,one is the "Map" sensor which faces up and is towards the pass side of the intake,the other 1 is for the SRV / Short Runner Valve and is more towards the middle of the manifold. I'm guessing you might be referring to the SRV,it switches the manifold from long runners to short runners roughly about 4800/4900 rpm. Your truck has what's commonly referred to as a "dual" runner intake manifold,and the SRV controls the flap inside the manifold that switches it from long to short runners. The truck utilizes the long runners down low in the rpm band to create torque,and then switches to short runners to promote higher rpm horsepower

Thanks for the info! After I posted the question, I enlisted Google fu. I'm now wondering if it can present problems without generating a code. Essentially, only electrical component are easily monitored.

 

[Hagar1]

There's 2 devices,one is the "Map" sensor which faces up and is towards the pass side of the intake,the other 1 is for the SRV / Short Runner Valve and is more towards the middle of the manifold. I'm guessing you might be referring to the SRV,it switches the manifold from long runners to short runners roughly about 4800/4900 rpm. Your truck has what's commonly referred to as a "dual" runner intake manifold,and the SRV controls the flap inside the manifold that switches it from long to short runners. The truck utilizes the long runners down low in the rpm band to create torque,and then switches to short runners to promote higher rpm horsepower

Slightest bit of throttle say 12% and engine vacuum drops to zero like you went WOT. Consequently, MAP is acting like engine is operating at full throttle under load. The engine is not revving wildly, just cruising at somewhere around 1700 rpm but almost zero vacuum and a 4.28 volt or so depending upon atmospheric pressure.