Ever since I replaced my engine the first time, (when it was still NA- just got a streetport) the check engine light would come on whenever the car got warm, and ONLY when I hit 0 vacuum at around 1500-3000 rpm's.
It won't come on when the engine is cold, and it also won't come on when it's summertime and it's hot out!
I check the codes, and it gives me a pressure sensor code.
I checked the pressure sensor, and it checks out fine, but maybe is still defective..
Here's the weird part- The light won't come on if I disconnect the vacuum hose to the pressure sensor. I dont' get it, because it throws a code whenever vacuum is at 0, at 2000 rpms or so, but it won't do it with the hose disconnected?? It should be reading 0 vacuum at all times!!! I know the ECU uses inputs from all sensors, and compares them to what they should be- if they are out, it generates a code, so maybe it's actually another sensor affecting it...
Any input is appreciated.

 

No educated guesses eh?

 

Did you try resetting the ECU? Mabey it just has the code stored in it and it throws it up when it hits that "sweet spot"?

 

About a million times... during engine changes and such.

 

A turbo charged engine with a non turbo boost/pressure sensor/????? Sounds like you need to install a ___________sensor (fill in the blank).

It could also be a indifferent wire connection on one of the wires to/from the sensor. Or a busted sensor. Or.....

 

This has been going on since the car was still NA, with just a streetport.
I'm going to try a new pressure sensor.
The weird part is that with the pressure sensor hose connected, when the when I hit the gas and the sensor sees 0 vacuum at 200 rpms, the light goes on.
With the hose disconnected, when I floor it at 2000 rpms, and the senor will be seeing 0 vacuum (since it is wide open-disconnected) it WON'T throw the code!
Doesn't make sense to me, because both conditions should be identical.

 

any upate here, similar problem...