My 94 mustang has 30 psi of fuel pressure. car starts out fine and then after a couple of minutes of driving starts bucking and backfiring at engine. then kicks in and runs fine again. i change the fuel pump, fuel filters, fuel regulator and did a complete tune up. still has problem.
I have a 94 mustang and the ac compressor went out on it and i have replaced the compressor and i need to replacer the dryer. I know that its not contaminated got the part for it and im not able to remove the dryer from the hose or the fire wall. i can pull on it and it still wont come out. the same with the hose that connects to the compressor. is there a special way to take it off or am i incompantant
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Re: cant get enough fuel pressure to run properly
May have to run in line fuel pressure gauge to determine if the fuel is losing pressure and causing this fault or wether you need to look else where like constant injector pulse,air flow meter,faulty distributor etc.
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Fuel pressure is a little low. Will it start with a couple shots of carb spray in the throttle body? If it does and continues to run than the fuel pump is not providing enough pressure to to open the mechanical poppet valves on the end of the injectors. minimum fuel pressure is 58 psi. One PSI below spec is enough to make it not start.
Also check to make sure there is spark at each cylinder. just because there is spark at the ignition coil does not mean it is getting the the spark plugs. you may have a bad cap or a rotor that is burned through.
Measure fuel pressure on injector rail - should be 38 to 40 psi. If low or fluctuating, then replace regulator. Another possibility is the in-tank filter being clogged - rare I know, but trash in the gas tank and it's clogged.
U may have a defective fuel pump check valve, if this is the case the system looses pressure after the engine is shut off and then causes this problem u are having. to check this u must hook up a fuel pressure test gaugethe fuel pressure test port on the top of the engine, it looks like a metal tire valve, this gauge cost's around $20.00 and is well worth the money, after the gague is screwed onto the test port run the engine and record the fuel pressure reading, then shut the engine down, the pressure should remove close to the running reading, if it drops more than 3 PSI you have a problem and need to replace the fuel pump which is located inside the gas tank.
Click the key forward BUT don't start the car listen for fuel pump to pressurize and shut off. But if the pump keeps running change the fuel pump relay switch under drivers seat. If its pressurizing and shuts off then its not your fuel pump. Fuel pressure at rail when idling is 30 psi.
Let me know what happens cause I know alot about Stangs had 2 5.0