Question about Cars & Trucks
This morning was pretty nippy, (about 52 degrees) and my 94 fanst would just turn over but refused to start. Sounded like it wanted to a few times but just wouldn't. I checked spark and just changed the air filter, it all seemed fine. Next, I pulled the line from my fuel filter that feeds the injection rail to see if I was getting fuel. Turned the key to the on position and nothing happened. Turned key to the start position and as the engine began turning over fuel shot out of the filter like a fountain and guess what ? The car fired right up, easier than it has ever since I've owned it.(about three weeks). I turned it off, hooked the line back into the filter and started it right up. Drove for two hours today without a problem. It seems to do this when the car is parked for several hours, like over night. When its warm, its fine. I'm stumped. Could it be the fuel pressure regulator ? When I pulled the vacuum line to check for fuel leaking past the diaphram, it was dry and I've read that's a sure sign of a bad regulator. Could too much fuel pressure keep the car from starting ?
No, not likely. And a dry hose is a good sign, but a hose wet with gas is a sure sign of a failed pressure regulator. Your problem may be the pump not priming the fuel system. Here's how it is supposed to work: when you turn the key to on, computer will signal the fuel pump relay to turn on for about two seconds, and without a cranking signal from the engine, computer will then turn the pump off. When key is turned to crank, the computer will then turn pump back on-when engine is cranking or running, the pump is on continuously. But just turning the key to on, you should hear the pump run for about two seconds, and that will pressurize the fuel system.
At those times when it doesn't want to start, you should test the fuel pressure to see if the fuel rail is pressurized. If no pressure or low pressure, diagnose the wiring at the fuel pump relay. The relay is very simple- 4 prongs, 2 on the power side, and 2 on the coil side. The power side has a hot at all times wire and then the wire going to the pump. The coil side of the relay has a wire from the engine computer, and the other coil side wire is a ground. When the coil side is energtized by the wire from the computer, the relay is switched on and will pass power from the hot wire to the pump. So if the pump doesn't come on briefly to prime the system, the computer may not be signalling the relay, or there is a wiring problem around the relay. Good luck. You might just try a different relay-maybe yours is sticky and not responding.
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Posted on Jan 02, 2017
I had the same issue with my 4.0, I went through all the same BS you did and in the end it was a faulty fuel pump. Pricy i know but im sure thats your problem
Posted on Nov 15, 2009
have diagnostic codes checked to see if you have a cam or crank sensor fault. make sure fuel pressure is at the required pressure, just testing to see if you have fuel at the valve is not enough. replace all spark plug wires. if you replaced two then all are just as old and even when they "look good" does not qualify as "they are good". Replace coil pack. start up drive away happy
Posted on Sep 05, 2011
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