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Power Strokes
7.3 Tech
7.3 no start
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[QUOTE="Denver, post: 1549759, member: 608"] So the truck started and runs fine... after some no start tries. Here's what I got. Had a battery tender on each battery over night and into this afternoon. Had a green light on both. Each showing 12.5 volts now. Seems low but whatever. Hooked them up and go to start and just turns over but doesn't fire. No smoke out the exhaust. Had the volt meter on the driver side battery and key off voltage is 12.3. Key on engine off voltage went to 11.3. Key on starting went to 10 then after 3 cycles went to the 8's. So now I unplug stuff one at a time and try to start, then plug back in after trying to start. Unplug the EBPV plug on the pedestal and no start. Unplug the ICP sensor and no start. Wiggle the valve cover harnesses and no start. Wiggle the IPR and no start. Early on I noticed a 1 to 1.5 volt drop with key on engine off. I went to another 7.3 that is at operating temp and it doesn't have but maybe a .5 volt drop between key off and key on engine off. When starting it went into the high 11's. Something is pulling power. The glow plug control module (California Truck) feels warm. I swap in a bad one and still get the voltage drop and no start. Reinstall the good one. Now I unhook the alternator wiring and plug on it and still get a voltage drop and no start. Turn the key off and grab a SCT X3 to read codes and alternator still unplugged. Turn key on engine off and volts drop into mid 10's but didn't try to start, just get codes. Came up with P0475, P0603, P1000, P1280. So now I'm reading the code description on the SCT and writing the codes down. Takes some time... I look up at the volt meter and have 12.12 volts. Figured its over 12 and turn the key to start and it started right up just like it always has for the past 18 years. Let it run for 3 seconds and shut it off and then restart with no glow plug cycle and it starts up just fine and volts were between 11.5 to high 8's while cranking and still started. Reconnect the alternator and it started right up and charging volts are 14.1. Did about 3 more starts and is back to normal. Now here's where there is still something going on. The first 4 key cycles there is something pulling power. With the key off volts are low to mid 12's. Key on engine off the volts start at 11.5 and go into the mid 10's. After a minute, and I timed it, the volts come back up to the 12's like a switch is flipped. After the 5th key cycle the volts were staying in the 11's with key on engine off, until that 1 minute mark. What is on these trucks that has a 1 minute cycle once ignition is turned to on? Fuel pump is like 15 seconds, Glow plugs seem about 20 seconds (after engine starts) but don't know the cycle time with engine off. I know I still need to get the batteries load tested but is there anything in my novel here that can lead me to the culprit? [/QUOTE]
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