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Re: 96 intrapid 3.5
Hi how are you?just because you hear the fuel pump running does not mean that it is pumping enough preasuer to the motor to open the injectors. you need 48 lbs with key on engine off and with the vacume line off the presure regulator.if you have enough presure then you will have to check for a good blue spark.the fuel presure test port is located just under the thermostat housing on the steel fuel rail.
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Reasons for engine turning over and not firing are simple. Spark or fuel. If you've changed the coil packs then chances are it's a fuel issue. Get in cab and turn ignition to second position whilst listening to back seat. You should hear the faint noise of the fuel pump working. If you can't, I suggest you firstly check your manual to find the fuse/relay for the fuel pump and check that. If they are fine, you need to replace fuel pump.
If you can hear it working and it still won't start, remove the fuel line going to injector rail and point into a jar whilst someone turns engine over. You should have fuel coming out. If this is fine, go back to ignition, remove a spark plug and turn engine over checking for a spark.
My bet is your fuel pump has packed-up. Good luck diagnosing.
What you are telling me is the engine is firing the plugs but not getting fuel. When you changed the fuel pump and filter, did you check the fuel pressure at the rail ? Are the injectors getting power and ground pulse ??
Generally speaking, its supposed to do that. The fuel pump(s) is powered by a relay that turns on for 3 seconds when you turn the key on. If the engine does not start and produce oil pressure, thats all the power the pump gets. If you were in a wreck the pump would shut off when the engine dies even with the key on to prevent a fire. You would need to jumper the relay to make the pump run beyond the 3 second time.
i had the same issue with my 96 chevy 1500. i sprayed just a little bit of starting fluid into the throttle body to see if it would fire on that. when it did i knew i had spark. turned out to be the fuel pump. try it and see what happens. all you need is just a quick spray. also i noticed that when i turned my key to the on position, i didn't hear the pump kick on to pressurize to lines.
Replace the fuel filter to help the fuel pump, but it sounds like the fuel pump check valve has gone bad and your losing your fuel pressure to start the engine. Your going to have to keep priming the fuel system by turning the ignition key to the run position for 5 seconds 3 times before you try to start the engine. The only fix for this is to replace the fuel pump, and that is costly. Good luck and take note: the fuel pump has a life time of around 150,000 miles and anything past that is borrowed time.
Have you pulled a plug wire and checked for spark? Do you know for sure that your fuel injectors are firing? You can get gas all the way up to the fuel rail and nothing coming from the injectors. If there is no power getting to the injectors (check them for pulses while turning the engine over) The camshaft sensor will be the problem. They are known for just dying out. If this doesn't help, I'll still be here for you. Best wishes to ya.