minuteman wrote:
I'm still waiting on the new MAP to get here from Arizona so no resolution yet. I did look over all the hoses I could find and didn't see a problem. I bypassed the new solenoid again Sunday and went on a 45 minute drive and I honestly couldn't tell the turbo was acting any different that usual. I assume the solenoid just acts as a safety shutoff from the ECM and doesn't regulate anything.
I searched the CRD manual for diagrams or descriptions of how the vacuum system works with the turbo but couldn't find anything. If anyone knows what page in that 2400pg manual it's in, please let me know.
There are two vacuum solenoids. A big one and a small one.
The small solenoid is just a on/off device that closes when off to maintain vacuum in the reservoir.
The big one has a small filter stuck at the bottom of it and is what modulates vacuum to the turbo actuator, therefore controlling boost.
With the engine running at idle, you can disconnect the vacuum line at the turbo. You should feel strong vacuum from the line.
Also, look between the engine and turbo to find the rod that connects the actuator to the turbine housing.
Disconnect the vacuum line and watch the rod drop.
Reconnect it and watch the rod pull up.
Diagnosing boost problems is kinda hard without a boost gauge.
If you dont want to install a boost gauge, get a ELM327 OBD bluetooth adapter and run the torquepro app on your android device.
It can give you boost readings as well as data from other sensors.