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4.7L/4.7L HO/4.7L Gen II Engines Questions regarding the 4.7L V8 engine

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  #1  
Old 02-19-2010, 05:24 PM
brandonppr brandonppr is offline
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2001 4.7 starts up runs perfect then shuts down after 5 seconds

I just got done fixing the bad head. It ran before but badly because of a lifter issue. I fixed that. Now I fire it up and it runs perfecty smooth and then just shuts down after 5 seconds or so.
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  #2  
Old 02-19-2010, 06:36 PM
WestCoastKevin WestCoastKevin is offline
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Is it starved for fuel? Can you put a fuel pressure gauge on it? After it dies, does it immediately start or is it hard to start back up? Any codes?
Kevin
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Old 02-19-2010, 06:51 PM
brandonppr brandonppr is offline
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Is it starved for fuel? Can you put a fuel pressure gauge on it? After it dies, does it immediately start or is it hard to start back up? Any codes?
Kevin
It will start back up without a problem then does exact same thing.
I can still hear the fuel pump running when it dies.
I still have the security light flashing, but before I took it down it would run if I held the gas and it ran poorly, now it runs great but dies.

I still need to check for codes. I am going to go get a scanner and see if it has any.
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Old 02-19-2010, 07:48 PM
brandonppr brandonppr is offline
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OK i've got codes:
P1388 Auto Shutdown (ASD) Relay Control Circuit
P1491 Rad Fan Control Relay Circuit
P1685 Skim Invalid Key
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  #5  
Old 02-19-2010, 09:23 PM
blkjak blkjak is offline
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these are my guesses trying to help or promote the correct answer. LOL blkjak

p1388 - The code refers to the auto shut down relay. Pull the relay out and switch it with the a/c relay. If it starts and runs, replace the relay.

p1491 - check the # 39 fuse.

P1685 - The Sentry Key Immobilizer Module (SKIM) is part of the security system and kills the vehicle when a wrong key is used. There may be a problem with your key or the chip reader in the ignition switch. This code will also be set if someone actually tried to steal the vehicle. Using a spare key maybe that's it.
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Old 02-19-2010, 10:08 PM
brandonppr brandonppr is offline
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p1388 - The code refers to the auto shut down relay. Pull the relay out and switch it with the a/c relay. If it starts and runs, replace the relay.
Where is this relay? I can't find it.
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  #7  
Old 02-19-2010, 10:49 PM
bwdakrt
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Where is this relay? I can't find it.
In the fuse box under the hood on the drivers side.
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  #8  
Old 02-19-2010, 11:18 PM
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adnedarn adnedarn is offline
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How about clearing the codes and trying to start it... That way you'll see if all codes return right away or if one is a stray from who knows when. That way you know you're dealing with current codes.
Andrew
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Old 02-20-2010, 12:34 AM
blkjak blkjak is offline
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  #10  
Old 02-20-2010, 04:47 AM
brandonppr brandonppr is offline
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I cleared the codes and they came back. I'm going to try another PCM and see what happens. I ordered one today and got it programed to my vin and miles.
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  #11  
Old 02-20-2010, 04:50 AM
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SIM code, then the PCM is shutting the truck down because it thinks someone is trying to steal it by not using the proper SKIM key. So either the SKIM module is bad or you aren't using the right SKIM key.
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  #12  
Old 02-20-2010, 09:46 AM
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Yup, Brian is right.

It's doing what it should do. It doesn't recognize the key you're using (for whatever reason) as being correct, so it won't stay running.

Do you have another key to try?
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  #13  
Old 02-20-2010, 02:05 PM
l1tech l1tech is offline
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I cleared the codes and they came back. I'm going to try another PCM and see what happens. I ordered one today and got it programed to my vin and miles.
Waste of money. Like the 2 previous posters said, you have a SKIM problem.
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  #14  
Old 02-20-2010, 02:12 PM
brandonppr brandonppr is offline
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I only have one key and it started it before.
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  #15  
Old 02-21-2010, 12:38 AM
l1tech l1tech is offline
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I only have one key and it started it before.
Nothing lasts forever. If you have a skim problem the truck will not run...period
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