Hi all,

I have a turbo 96 miata with a MSPNP. I recently had an issue getting it to run at all and traced the issue down to the wiring at the VVtuner box. I have not yet fixed the wiring, and instead unplugged the VVtuner box and the VVT solenoid on the engine. Now the car runs, but it will immediately stall if I let off the gas at any engine temperature. I noticed from my composite log that I was having an issue getting my MAP sensor readings to display correctly. Looking at all the vacuum connections, I realized that the vacuum line going to my boost gauge had come out. I reinstalled the line and the car barely idles (around 400 rpm) and is close to shutting off. I checked all other vacuum lines and everything appears to be connected with no kinks. My vacuum reading at idle is around 88Kpa which does not seem correct. Is there a ballpark vacuum reading that I should be shooting for? Is there anything I should look at besides vacuum readings? I have attached a composite log if that proves helpful. Thank you.

 

You should see around 30-31 at idle. Is your sensor calibrated?

 

vacuum is a bit low on the vacuum gauge I teed into the brake booster so I think the sensor is working correctly. It reads 98kpa with the car off and the key on..

Are there any other obvious sources for vacuum leaks? Would it make sense to check for the leak pre throttle body?