I just recently ran my 95 Z28 A4 at the track with my NX 150 shot and had no problem, but the last 2 times I have connected the line to the tank and pressurized the line I have had problems.

As soon as I pressurize the line(with car on) the SES light comes on, later I have found it gives the same 2 codes:
CODE 34 MAP SENSOR LOW
CODE 22 THROTTLE POSITION LOW

Then when I drive the car normally it will surge violently if given any gas barley over idle. Then when i turn the bottle off and release the pressure in the line(with car on) the SES will go off and the car will drive good once again.

This leads me to believe the nitrous solenoid is leaking, if i am correct how can i fix this problem?

Phil

 

It is a good idea to get into the habit of closing your bottle when you are done using it and purging the excess from the line.

 

Yes, I always close my bottle and drain the line after I am done with the stuff. I have only forgotten once and left the line pressured threw the night, but when I woke up, I remembered and shut it off.

This is only the start of my 3rd bottle of N2O. I bought the NX kit brand new the middle of last summer. Do you think that the solenoid is bad??

I was thinking in the direction of it was clogged and wouldn't close all the way, but that would make sense if it is bad.

Phil

 

If you get dirt in the seat, or the seat is damaged, the solenoid can leak. If it is leaking, it should feel cold to the touch.

 

Another easy way to tell if the nitrous solenoid is leaking, is to disconnect the braided line from solenoid to the nozzle. Then, go back and turn the bottle on (with the system switched off). If air is coming out, then obviously it is leaking. This happened to me, even with a nitrous filter. Send the solenoid out to be disassembled/rebuilt.

 

do you have a N2O filter? they are a good investment. if you ahve to send the 'noid off, good luck. i sent all 3 of mine to NX to have tehm rebuilt while the 383 was going in. the Fuel Solenoid leaked before i sent it to them. after they 'rebuilt' them, they told me they were all good as new. the fuel one still leaks! so i cannot even leave the Fuel line hooked up. if i want to spray, i have to remove the Schrader and hook up the fuel line. when i shut the car off, i have to vent the tank to try and drop some fuel pressure or fuel will leak into my intake elbow. when it does this the MAF, Air temp Sensor, or something gets covered with fuel and the plugs get fouled out andit all causes the car to run like crap. I really need a new fuel noid...