1997 - 2006 Expedition & Navigator 1997 - 2002 and 2003 - 2006 Ford Expedition and Lincoln Navigator Discussion

Help with my codes please

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Jul 28, 2009 | 12:12 AM

#1

JasWood

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From: NSB, Florida

Help with my codes please

I have a 99 Expi. with 139k on it with the 5.4. It's been bucking and stalling on my wife. I ran the codes and they read: P0401 P1299 P0300 P0443 P1451 P1309 I took it to the dealership last year for similar issues and they stated it could be the #4 coil back feeding into the PCM or a bad computer. I took it home and replace all of the coils with Accel super coils, and have since replaced the coils on three different cylinders. The temp gauge reads fine. I need to fix this because it stalled in an intersection today with my kids in the truck with her.

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Jul 28, 2009 | 12:29 AM

#2

alloro

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Have you connected a fuel pressure gauge to the fuel rail to determine if the fuel pump is weak?

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Jul 28, 2009 | 12:37 AM

#3

JasWood

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From: NSB, Florida

I'll check again in the morning. Running was like 32 and off was like 40.

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Jul 28, 2009 | 07:33 PM

#4

JasWood

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From: NSB, Florida

Quote:

Originally Posted by JasWood

I'll check again in the morning. Running was like 32 and off was like 40.

Checked it again and the numbers were the same

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Jul 28, 2009 | 10:14 PM

#5

alloro

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Your pressure is low. Fuel pressure should be up around 45 PSI at all times.

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Jul 30, 2009 | 02:03 PM

#6

luvmyexpy

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get a good used pcm, see what happens from there. i bet that is the issue, or a wire harness short.

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