01 7.3 hard start when cold - Ford Powerstroke Diesel Forum
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Old 12-17-2007, 10:48 PM
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01 7.3 hard start when cold

I have a 01 7.3L after sitting a day or two I have hard starting problems.
I replaced the glow plugs, then the relay. I checked that I had signal for the relay and have power at both sides.
I do have an oil leak some where around the HPOP pump it comes and goes with the hard start. some days it start fine and some days its a pain. Any of ideas?
please help.
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Old 12-18-2007, 04:16 AM
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weak batteries. I assumed you have OHM'd the GP's to be sure they are working? Our trucks need to see so many rpm's before they will fire. Even though the batteries test good at AZ they are not strong enough to kick over our high compression engines. I would replace both batteries and make sure all terminals are good n clean.
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Old 12-18-2007, 08:30 PM
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all the glow plugs are good, Batteries are good. The truck tries to fire thats why I changed the gp. Its like it as a fuel problem. It fires just on what sound like 2 or 3 holes rev it up and it clears up after a few mins. I thought maybe the fuel pump bleeding back? or maybe oil supply to the injectors?
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Old 12-18-2007, 09:14 PM
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How cold is it there and how does it act when it starts does it idle high then low or is it like a miss. If its doing the first a lot of are trucks do this with out being plugged in i was told its there nature.
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Old 12-18-2007, 11:25 PM
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Mine is also a bear to start at anything beloe 5 celcius, Ones it's at full operating temp it seems to run fine but anything below that and the EBPV kicks in and out annoying as hell that! and it runs piss poor almost like it's running on 7.. once it's warm it's golden?
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Old 12-19-2007, 08:10 PM
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It runs great after a few mins. it feels like its running on 4 cyl. when you start it.
Its only about 6 celcius out side. Its like dripping injectors but its only first thing in the morning. Then it runs like a top all day.
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Old 12-20-2007, 05:33 AM
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unplugged the EBPV and it's way better!
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Old 12-20-2007, 07:38 AM
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Quote:
Originally Posted by redneckracer81 View Post
It runs great after a few mins. it feels like its running on 4 cyl. when you start it.
Its only about 6 celcius out side. Its like dripping injectors but its only first thing in the morning. Then it runs like a top all day.
In the tech section there is instructions how to test the UVC harness.

Don't go and unplug the EBPV, I don't understand why someone in cold country would do that. So what about the sound.

If you have bad injector o rings or dripping the truck would make popping or snapping sounds when at WOT or while towing a load and throttling it hard in addition to running like crap when cold. In addition it can also shudder like a gas engine that is pinging from timing.
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Old 12-20-2007, 11:38 PM
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What could be leaking in the valley? I just changed the o-rings under the turbo. It looks like oil from the HVOP. Any thing I can check?
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Old 12-22-2007, 09:41 AM
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hey man
I put a dummy light in my dash for the power side of the glow plug relay. when the retard dash wait to start light goes off i let the power stay on to the relay which is heating the glow plugs more. i live in mich and since then i never had a slow starting truck.
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