Fuel pressure

1998 DODGE DURANGO
153,000 MILES • 5.2L • V8 • 4WD • AUTOMATIC
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JPUTNAM
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I checked my fuel pressure with a gauge and after turning the switch on a off about six or seven times it held at 44 psi. I could not check it at idle because the engine will not fire up. Should I have to do that to get the pressure up or should it come up on one or two tries?
May 21, 2018 at 9:39 AM
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PATENTED_REPAIR_PRO
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It should be 44 psi the very first time.
If you have 44 psi even after seven tries, and it still will not start you may be either missing fuel injector voltage and/or pulse or no ignition spark. So start by checking the fuel injector fuse/s and for a spark or see if the engine will start and run for a few seconds with some starting fluid, if so then you know it has spark.
The fuel injectors are powered from fuse #3 in the PDC and a auto shutdown relay, to same PDC. That also feeds the ignition coil.
May 21, 2018 at 9:44 AM
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JPUTNAM
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Okay, I put my battery charger on until it had a full charge and it fired right up. Now before I charged the battery it was turning over fine. I do no like it when it does that. Now I do not know if it was just low voltage or what.
May 21, 2018 at 11:17 AM
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PATENTED_REPAIR_PRO
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Could have been a loose connection. Check the battery cables ends at both ends by twisting real hard and if they move at all, they are too loose.
May 21, 2018 at 11:19 AM
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JPUTNAM
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Just when out to crank it up to check the alternator and guess what, it turned over good but did not fire up.
May 21, 2018 at 11:45 AM
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PATENTED_REPAIR_PRO
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Okay, recheck everything, fuel pressure, spark, etc. Try some starting fluid too that can substitute for the entire fuel system so if it starts and runs a few seconds, then you know it has spark if not. Check for voltage to fuel injectors with key on run and then a pulse while cranking.
May 21, 2018 at 12:29 PM
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JPUTNAM
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What are the resistance specifications for the coil on my vehicle?
May 23, 2018 at 6:37 AM
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PATENTED_REPAIR_PRO
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Coil Manufacturer = Diamond
Primary Resistance = 0.96 - 1.18 ohms
Secondary Resistance @ 70°- 80°F = 11,300 - 15,300 ohms

Coil Manufacturer = Toyodenso
Primary Resistance = 0.95 - 1.20 ohms
Secondary Resistance @ 70°- 80°F = 11,300 - 13,300 ohms
May 23, 2018 at 7:03 AM
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JPUTNAM
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When I check the primary resistance do I put my meter on 20k?
May 23, 2018 at 7:18 AM
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PATENTED_REPAIR_PRO
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No, use a scale closer to the 1 ohm scale, since that is the reading you are looking for. 20k is 20,000 ohms, way too much.
May 23, 2018 at 7:20 AM