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05 5.4 PATS issue? crank, no/intermittent start. Lots done!

2004 - 2008 F-150

05 5.4 PATS issue? crank, no/intermittent start. Lots done!

 
  #1  
Old 02-11-2019, 08:40 PM
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Join Date: Feb 2019
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05 5.4 PATS issue? crank, no/intermittent start. Lots done!

I feel like Iíve been searching for days. So I have a crank no start issue. Sometimes it starts sometimes it donít.

Erratic rapid flashing theft light& wrench light to the same beat. Also noise by the fuel tank at that same beat.

I just keep cycling until it starts up then everything is normal. Runs and drives great.

Shows code p2107 on scanner.

U900 and U950 on the HEC test

What I've done.
FPDM
Swapped PCM relay
Checked fuses none blown
PATS tranceiever
New key
Throttle body motor (mechanic advice) he also checked fuel pressure, crank sensors and spark.
Reseat cluster connection
Reseat PCM connection

One dealer said they donít want to mess with it. Iím at a loss here except trying another dealer. Anything anyone has seen or heard of lately?

 
  #2  
Old 02-11-2019, 08:42 PM
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N/a
 

Last edited by Thebigswede100; 02-11-2019 at 08:45 PM.
  #3  
Old 02-11-2019, 09:10 PM
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Join Date: Jan 2002
Location: Wilmington,NC
Posts: 4,605
You may have to find a good mechanic who knows how to use a scanner and is competent at troubleshooting circuits. If you live in NY, I suggest you take it to South Main Auto Repair or Pine Hollow Diagnostics. I've been watching their videos and they solve some complex problems.
 
  #4  
Old 02-12-2019, 12:27 AM
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glc
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Location: Joplin MO
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Common Causes Of A P2107 Code

Possible causes of this code may include:

Faulty throttle body
Dirty throttle plate or linkage
Faulty throttle position sensor
Defective accelerator pedal position sensor
Throttle actuator control motor is defective
Corroded or damaged connector
Faulty or damaged wiring
aulty PCM

Common Repairs

Replacing throttle body
Cleaning throttle plate and linkage
Replacing throttle position sensor
Replacing throttle actuator control motor
Replacing accelerator pedal position sensor
Cleaning corrosion from connectors
Repairing or replacing wiring
Flashing or replacing PCM

Read more at: https://www.obd-codes.com/p2107
Copyright OBD-Codes.com
 
  #5  
Old 02-12-2019, 07:12 AM
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Join Date: Oct 2002
Location: St. Louis (Out in the woods)
Posts: 6,601
I'd suspect a scanner is going to be of limited use in this case.

U900 and U950 on the HEC test
Are you certain about those codes? Perhaps U1900 & U1950 instead?

Erratic rapid flashing theft light& wrench light to the same beat. Also noise by the fuel tank at that same beat.
Okay, this is intriguing. Can you, perhaps, do some more investigation as to the absolute source of that noise "by the fuel tank"? Is it coming from inside the tank or from something immediately adjacent to the tank. If so, what? You'll probably have to crawl under there while someone operates the key repeatedly.

Is there any history about what happened when the issue first occurred and immediately prior?
 
 


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