Originally Posted by Nitro Dave's Nitrous Outlet

Robert. I have not went back and read from the beggining.But you are ringht in this case. If he had a wiring problem which he did it probley did hang the solenoid open.

However yes I have seen a nitrous solenoid (only) hang open and cause a nasty back fire. That why IM saying it had to be the fuel vapors in the intake from the car itself in the case I am thinking about.
Dave