my 7.3l diesel shut off. now it won't start at all - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 05-20-2008, 04:37 PM Thread Starter
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my 7.3l diesel shut off. now it won't start at all

my brother-in-law's 7.3L diesel shut off and now it won't restart. think it might be something in the fuel system. maybe injectors? maybe relays? fuel flow not there. any suggestions?
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post #2 of 17 Old 05-20-2008, 04:41 PM
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does the tach move when trying to crank?? if not, go to Ford dealer for a free CPS replacement to start.

if still won't start, watch to see if the "wait to start" light comes on. if not, you have a blow fuse.

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post #3 of 17 Old 05-20-2008, 04:43 PM
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Originally Posted by sldghamr View Post
does the tach move when trying to crank?? if not, go to Ford dealer for a free CPS replacement to start.

Depends on the year. Only the OBS does this.

if still won't start, watch to see if the "wait to start" light comes on. if not, you have a blow fuse.
I'm going to assume it is a 99-03 7.3 truck. Did he turn it off or did it shut off on its own?

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post #4 of 17 Old 05-20-2008, 04:45 PM
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Is there fuel in the tank. Just because the gauge says there is don't mean there is. I suggest you put 5-10 gallons in the tank and try to start up the truck. It may take a bit to prime the system. But it should fire after a few tries.

If this does not work then you need to check the fuel pump out. Scan for codes, your going to need to test the hpop as well. You will aslo need to test the idm too. So I suggest you get ahold of a diagnostic computer or someone with Auto enginuity. That way you can run tests and check for codes.

Also you may want to check the cps as well.


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post #5 of 17 Old 05-20-2008, 05:18 PM Thread Starter
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Quote:
Originally Posted by dieselqueen View Post
my brother-in-law's 7.3L diesel shut off and now it won't restart. think it might be something in the fuel system. maybe injectors? maybe relays? fuel flow not there. any suggestions?
more info...1994-95 7.3L. truck shutoff on its own. tachometer moves when cranked. acts like it wants to start. fuel not getting to all injectors.
Is there a relay or wiring problem to keep injectors from opening?
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post #6 of 17 Old 05-20-2008, 05:21 PM
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94? I say CPS. Mine was bad and my tach still moved.
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post #7 of 17 Old 05-23-2008, 10:57 AM
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The tach movement isn't valid after 2000, since this is a 94 my bet would be CPS, they are only $28 and you should have a spare anyway, I would change it and see if she starts, if not you have your spare. You really need to have it read for codes if this doesn't fix it. Not sure if a 94 is OBDII compliant. I know the 99-03's aren't. You really should try and post this in the OBS section you will get a better response.

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post #8 of 17 Old 05-23-2008, 03:33 PM
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$28.00, or $128.00? I paid $132.xx for mine, but I got it from a dealer... Overpriced... Well maybe, but it still works, 4yrs later. I'm sure they're less now regardless where they come from.
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post #9 of 17 Old 05-23-2008, 05:46 PM
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Quote:
Originally Posted by NCHornet View Post
The tach movement isn't valid after 2000, since this is a 94 my bet would be CPS, they are only $28 and you should have a spare anyway, I would change it and see if she starts, if not you have your spare. You really need to have it read for codes if this doesn't fix it. Not sure if a 94 is OBDII compliant. I know the 99-03's aren't. You really should try and post this in the OBS section you will get a better response.

NCH
Then why would you plug AE into your OBDII port if it is not OBDII compliant? I have never understood this. OBD II is newer than OBDI so why would a 94 be OBDII and the 99-03 not?

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post #10 of 17 Old 05-26-2008, 08:31 AM
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It's not the port that's OBDII, it is simply a connection, it is the computer language the two use to communicate with each other. You have been around diesel forums a long time, you know the fact that the generic scan tools from AZ, Advance etc.... don't work with our trucks without the specific software bundle for our trucks, this is because once a vehicle goes above a sepecific GVWR they don't have to be OBDII compliant, they can use their own codes and communication system in those vehicles. Our trucks fall into this catagory. How many times have you read posts where somebody argues they have no stored codes because the dude a pep boys checked it and said so, only to find out later that when a proper scan tool was used the codes were retrieved and pointed to the problem? When you buy the AE software, you must buy the one compatible with our trucks. I hope this helps.
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