Greddy Profec B spec 2 Not Holding Boost

[livedsm4g63]

So my profec B spec 2 decided to act up today. Everything was fine then all of a sudden i only had wastegate pressure. I was just driving normally when this happened. I did a boost leak and theres non to be found. Everything is hooked up right, it just stopped allowing me able to control boost. Any thoughts? The reading does display vacuum. It also shows around 100 kpa of boost when i do boost, thus making me think it is seeing boost, just not adjusting. Thanks for the help.

 

[doctor_shock10]

So my profec B spec 2 decided to act up today. Everything was fine then all of a sudden i only had wastegate pressure. I was just driving normally when this happened. I did a boost leak and theres non to be found. Everything is hooked up right, it just stopped allowing me able to control boost. Any thoughts? The reading does display vacuum. It also shows around 100 kpa of boost when i do boost, thus making me think it is seeing boost, just not adjusting. Thanks for the help.

maybe your solenoid is stuck? id start there

 

[livedsm4g63]

I opened it up but it all looked good. How would i tell if it was stuck open?

 

[bkrathwohl]

Would it be possible to suck/blow on it one way to get it to unstick?

 

[doctor_shock10]

Would it be possible to suck/blow on it one way to get it to unstick?

thats actually a good question.

 

[GSXeclipsePSI]

Try putting air pressure to the unit inside the car listen to hear it start ticking. I had one kind of stop working on me but I had a back up soliond. It should tick tick tick bunch of times til you reach a set boost pressure. Other then that check for a clog in the vacuum lines or break/leak. Those are my best guess, I have had this boost controller since 03.

 

[livedsm4g63]

Try putting air pressure to the unit inside the car listen to hear it start ticking. I had one kind of stop working on me but I had a back up soliond. It should tick tick tick bunch of times til you reach a set boost pressure. Other then that check for a clog in the vacuum lines or break/leak. Those are my best guess, I have had this boost controller since 03.

Ill do that first thing tomorrow morning and let you know if i hear the tick. If i dont hear ticking then would that be the controller itself? And if i do would that lead to a solenoid?

 

[GSXeclipsePSI]

I would check to see if you hear that noise. Then check your wire with a volt meter IDK the correct voltage and I cant check since I have mine hidden under battery tray. Then check at the controller and see if you have voltage there. That should narrow it down to what is bad. I can sell you the old one that worked and I think I cleaned it, call it $15 plus shipping its worth a try.

 

[livedsm4g63]

hmmm, i wonder what the voltage should be, because when i checked for voltage at the controller, where it sends to the solenoid, and it kept flashing zero volts on one wire and the other wire showed up to 250 millivolts then it would jump back down to zero. Then back up again.

 

[flyineagletsi]

Did you check the wire harness? Maybe melted wires from the heat? I wrapped the entire under hood wiring harness with a vacuum line just for safe measure.

 

[livedsm4g63]

I checked the connector at the controller and at the solenoid and they both have those weird readings. So i know its not a wire. Im thinking it has something to do with my controller not reading boost.

Try putting air pressure to the unit inside the car

Well i was able to test it out and i took off the vac line that was connected to the fpr inside the engine and i pumped it and my boost controller did tick and did hit the warning meaning that its able to read boost. What do you think? Solenoid is the only thing left i can think of. Any input?