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Are you saying it cranks good or won't start? If so, have a helper crank it while you check for spark at the plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
With engine cranking or running, I can't hear the fuel pump. The initial prime may turn it on for a second or so.
The battery connections are all good, both ends? Battery has a full charge? Some vehicles when battery voltage is lost, some modules may have to be reprogrammed. I can't help you with that? You may need a manufacturer specific scanner that can communicate with whatever module.
One way to tell if computer is awake, turn on the key, Hopefully any sensor that uses a ref voltage, it goes hot with key on, so check ref voltage.
This may be due to the fuel pump pressure check valve being defective. When the valve malfunctions it allows fuel to drain back out of the fuel line, then you must purge the line of air and fill it with pressurized fuel, this takes a few moments and this causes abnormally long crank times before the engine starts. I think on your truck the pressure check valve is on the top of the fuel tank, if not it is inside the fuel tank and part of the fuel pump module assembly, any parts store like NAPA or Carquest can look this up for you and find out if you can just replace the pressure check valve and not the whole pump module which is quite expensive.
upper 02 sensor run on a loop till the engine gets warm then it reads the sensor get you back on the road fast it will work better if the engine is warm when you take out the o2 sensor
check to see if getting fuel or if you smell gas when cranking if you smell gas you probably have a spark problem which will probably be a coil and or a pickup coil in your distributor replace coil and then distributor. If you are not getting gas most likely fuel pump in tank see if it will fire on starting fluid then replace fuel pump good luck
If this extended crank time is after it sits for a while. The fuel pump could be bleeding back and it takes time to prime the fuel rail again. easy to verify put a fuel pressure gauge on get it started, when you shut it off the pressure should hold. Hope this helps
a bad heater core will just leak. it could leak alot. do you ever smell antifreeze? check the coolant level. it can get pretty low before it will overheat. the thermostat should be ok but there could be corrosion. when you had the water pump replaced was the cooling system flushed? 2001, its probably due for a flush. what coolant does it take? (green or orange)
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