what kind of car? could be sucurity issue, does sucurity ligth flash if equipped.gmjim its a 94 e320 6cyl. it has problem starting and no fue; preshure. but if we un hook computer let sit for min then replug it will start and we replaced computer still does it
Don't know what your vehicle is but if it is fuel injected, it may have some fuel pressure but if it doesn't have the required amount of fuel pressure it isn't going to start. Do a fuel pressure test, you may have a bad fuel pump or bad fuel pressure regulator. Also check all the fuses. Also check the timing belt if it has one, it may have jumped or broke.
Get a can of throttle body cleaner.....spray throttle body cleaner into the throttle body.....open the blade and shoot some into the throttle body. Then try to start the car...if it starts, then you have a fuel delivery problem. Hook a fuel pressure gauge to the fuel rail and just turn the key on and see what pressure you get. If no pressure then it is either your fuel pump OR a clogged fuel filter. You can then put a new fuel filter on, test the pressure again and if still no pressure, you are pretty much looking at the fuel pump. If you get fuel pressure at the fuel rail and it still won't start then you probably have an injector problem.
pumping probably isn't helping if the truck has fuel injection. extended cold crank times are often caused by a bad cold start injector or the control for the injector. also if there is no fuel pressure (i.e. a fuel pressure regulator that is leaking back into the tank as the car sits), it will take awhile to start.
The fuel pressure regulator controls fuel pressure at the fuel injectors. It uses vacuum pressure to control the pressure. It is positioned on the end of the fuel rail. If they leak, fuel will go into vacuum line causing hesitation on start-up and the smell of gas at exhaust. Warning, Fuel is under pressure. Disconnect battery and release pressure before replacement.
try changing the fuel pressure regulator which is located on the front fuel rail. when you put the new one in make sure you put some lubricant on the o ring to keep from damaging it. Make sure the vacuum hose going to the fuel pressure regulator is good. The vacuum hoses wear/collapse and break - they can start acting up with just a leak and intermittent problem, but ultimately break all the way => no-start.
It could be a partially blocked air filter, fuel filter, fuel pressure regulator (if your vehicle has one) or low fuel pressure. Use a fuel line pressure gauge to see what the pressure is. You may need to look up the PROPER pressure for your vehicle, then compare it to the actual pressure. If it's low, check the fuel filter and/or fuel pump.
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