Hard/no start - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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post #1 of 3 (permalink) Old 11-21-2012, 02:16 PM Thread Starter
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Hard/no start

1999 F-350 7.3 (early, Oct 98) Truck started and drove fine to work, then 5 hours later, would not start. Truck would turn over, but did not fire. No 'smoke' or white cloud from tail pipe, so I assumed that the injectors were not firing.
I checked the HPOP and it had oil (once before, after sitting for a couple of weeks, it drained down and had to be manually filled). Topped it off and still would not start. Left it sit overnight, and came back the next day.
Day 2, decided to hook the batteries up to another vehicle to charge for about an hour. Meanwhile, checked the glow plug relay, and it was fine. Unplugged the fuel bowl heater, and double checked all the fuses. Nothing blown at all.
Tried to start and it spun over but just did not catch.
At this point, got the wife to spin it over while I sprayed brake cleaner in the intake. After a couple of sputters, and a couple more sprays, it cranked. After a second or two, settled down to a smooth idle. Drove home (38 miles) and it did not miss a beat.
Drove to a local PSD shop and cut it off. The first time trying to restart (after 30 seconds off), it almost started, but did not 'catch'. Waited a minute and it cranked right up.
So, the shop guy and I talked and he thought it might be a bad injector o-ring, but, hesitated because it should have cranked easier cold, and not easily hot. We are going to put a scanner on it either today or Mon to check the oil pressures, but wanted to know if anyone else has had a similar problem.

99 F-350 CC LARIAT PSD 172 DRW 4x4 Auto 3.73
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post #2 of 3 (permalink) Old 11-21-2012, 04:22 PM
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Sounds like that shop has a plan. The o-ring remark is spot on, as well as getting a scanner on it to check first. When you check it, try to get a KOER, KOEO, and buzz test

99.5 PS CC 4x4 SRW ZF-6
Triple Pillar Gauges; Fuel pres, Pyro, Boost
AE, Alldatadiy, and half a clue
- AKA "The Big White Truck"
The first part to be thrown at these trucks should be a PSD compatible scanner

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post #3 of 3 (permalink) Old 11-24-2012, 02:05 PM Thread Starter
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I think I found the problem. I was just not convinced that it was a HPOP or o-ring problem, so I decided to go have the batteries checked. Sure enough, one came up bad. It apparently was not bad enough to kill the other battery, but bad enough to slow the cranking speed up just enough.
Hope that did solve it, since tonight is going below freezing. Guess I'll find out real quick.

99 F-350 CC LARIAT PSD 172 DRW 4x4 Auto 3.73
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