questions about Gen III sensors

[workingdog]

I'm hoping someone can identify these for me. I think I know some, but I'm not 100% sure.

What's #1? Is it the Intake Air Temperature? What's the bulb? Ambient temperature?

What's #2 blocking off?

I'm assuming #3 is Idle Air Control IAC

and that #4 is TPS sensor telling the computer where the throttle is.

Peter

 

[reddingcruiser]

#1 is the evap purge solenoid.
#2 I'll have to check
#3 is the Idle Air Control (IAC) valve
#4 is the throttle position sensor.

 

[orion]

I believe #2 is EGR...

- Brian

 

[workingdog]

Thanks so much. Evap purger never occured to me. Where is the IAT on this motor?

 

[mr jits]

Pretty sure #4 is tps, #3 is IAT, #1& #2 are a part of egr system.

Thanks so much. Evap purger never occured to me. Where is the IAT on this motor?

 

[64Rotorhead]

Great books, well worth the coin IMHO.

How to Use and Upgrade to GM Gen III LS-Series Powertrain Control Systems

 

[workingdog]

Thanks for the recommend on the book - I will order.
I'm leaping head first into HP Tuner right now and it will help.

 

[sadam_husain]

Thanks so much. Evap purger never occured to me. Where is the IAT on this motor?

IAT is built into the MAF sensor on the truck engines 5.3/6.0