I was looking on a web site the other day and saw a T.S.B. for my truck that it lacked power in high temp conditions. I have noticed that anytime the temp outside gets above 98' the truck seems to go into a low power mode or something. Once the temp hits above 110' it will go back to normal. I always though that this was because of my Diablo chip but I guess not.

Does anybody know anything about this T.S.B. for the '02 F-150 5.4?

I would like to know if it is something I should be worried about. I also have some slight knocking when the engine is cold. I have had both these problems since I got the truck and I am just about to hit 36,000 so I would like to get them taken care of soon if I need to.

 

nobody knows anything about this t.s.b.???

 

The TSB is 02-12-3

FORD: 2000-2002 EXPEDITION, F-150

ISSUE:
Some vehicles equipped with the 5.4L-2V engine may exhibit a lack of power condition when operating in ambient temperatures above 38°C (100°F). This may be caused by the Powertrain Control Module (PCM) calibration which retards the ignition timing to prevent detonation when the Inlet Air Temperature (IAT) reaches 60°C (140°F) or above. This may be more pronounced during stop-and-go driving.

ACTION:
Verify the condition. Reprogram the PCM with the latest calibration and on 2000 and 2001 F-150's, install body plugs behind Coolant Overflow Bottle if missing. Refer to the following Service Procedure for details

Not sure if the reprogram of the pcm will screw up your chip, but I would remove the chip before taking the truck in.

Hope this helps
Later

 

Thanks for the reply.

It sounds like it would mess up the chip so I will just live with the problem for now.

Maybe later down the road I may have it reprogrammed.