super5

I HAVE A 90 NOTCHBACK 5.0 WHEN I START THE CAR THE MOTOR JUST CRANKS. WHEN I PIN THE PEDDLE TO THE FLOOR IT WILL FIRE. IM GETTING CODES 23 AND 85 ON MY SCANNER CAN ANYONE HELP

brando5.0

I dont have my book on me now, but I would think you either have problems with the fuel pressure regulator, the IAC motor, or the TPS. I have the same problem intermittantly, especial when the engine is already hot. I replaced the pressure regulator because it was leaking, but that didnt completely solve it. The IAC would give it a rough, or high idle. Sometimes, it can jump to 3000+ rpms right away when it starts, without even hitting the gas. To check the TPS, use two pins and a voltmeter. Slide the pins in the connector for the TPS, with the key on, engine off. I cant think of what the wires are now, but I'm sure someone else here knows. You should get a reading of .88 to .89 volts. If not, try to adjust it by loosening the mounting screws and turning the tps. If its too far out of range, you might need to replace it.

Djs94stang

I think when you put the pedal to the floor, it shuts the fuel off to the fuel injectors. I believe this is universal to all fuel injections in case the engine is flooded. Maybe you are flooding the engine and when you put your foot to the floor it shuts the fuel off and then you fire on the excess that you put into the motor previously. Sounds like a fuel problem.

Casper98GT

Sounds to me like you have a bad IAC..... Putting the gas pedal to the floor shuts off fuel in a fuel injected car.... So if you shut off fuel and youre car starts, youre letting it have more air than fuel.... Why would it be a fuel problem? If youre car starts with more air than fuel, sounds like youre not getting enough air. Hence the reason why youre IAC is stuck or carboned up. Happens all the time, this is actually a trick that most people dont know about. If it doesnt start, first thing you do it floor the gas pedal. If it fires up the IAC is sticky.