03 F150 cranks fine but won't start when hot

Asked by Nicksford Jul 01, 2019 at 03:49 PM about the 2003 Ford F-150 Lariat Crew Cab 4WD SB

Question type: Maintenance & Repair

I have an 03 5.4 Triton runs fine when cold. Once operating
temperature is reached truck completely cuts off no matter
stopped or driving. Idle air control sensor camshaft
position sensor temperature sensory new air filter still
same problem I can't figure it out please help

7 Answers

P0174, P0171, p1000, p0232, P0122, c1090,c1202, B 1670, c115 0, c1155. That was when the problem first started after replacing everything unfortunately I had to unhook the battery to pull the alternator to change the temperature sensor now I'm not even having a check engine light but the problem still exists right now I'm sitting in AutoZone since 9 a.m. it is now 4 p.m. I can't keep throwing money in Parts at it without knowing the proper issue as soon as operating temperature is reached it bogs down and cuts off.

The first, second and fourth code are what I would concentrate on. The P1000 only means a drive cycle has not been completed. Too lean could mean a lot of things but I would be looking for a vacuum leak, probably a big one. Has this truck been flooded or in a major accident?

1 people found this helpful.

It has been to a mud bog it is a 4 by 4 but after the mud bog the problem didn't arise until a month later which is understandable but this problem to occur due to mud. I have changed the purge valve which I did not stay in my top post no accidents. It still runs fine when cold as soon as I parading temperature hits she bogs down then cuts off

There are no EVAP codes to indicate a purge valve problem. All those chassis codes may be from mud bog abuse. I would also check your O2 sensors, if they are bad it could make the computer think the truck is running lean. Did you remove the cats on this truck?

1 people found this helpful.

It has been to a mud bog it is a 4 by 4 but after the mud bog the problem didn't arise until a month later which is understandable but this problem to occur due to mud. I have changed the purge valve which I did not stay in my top post no accidents. It still runs fine when cold as soon as I parading temperature hits she bogs down then cuts off

Update I took it to Pep Boys Auto the mechanic told me that it needed a fuel pump and he's going to change the filter as well I'll know by tomorrow $800 later

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