Question about 2005 Ford F 250 Super Duty

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We are experiencing an intermittent loss of power on our 2005 Ford F250 super duty 4x4 6.0 liter diesel truck (45k miles on it). Description: While towing a boat, the truck loses power. When climbing grades the speed drops to 40-50 mph. Pressing the accelerator did not help, it was as though a governor was limiting the speed. If I backed off on the accelerator, the truck would eventually up-shift and increase speed (once we passed the steep part of the grades). This loss of power was not consistent as we were able to climb some steep grades at 70 mph while on some small grades we slowed to 40-50 mph. Also, using the 'tow/haul' button did not seem to change the truck's power output/speed. Also note that all fuel filters and the air filter were replaced after first experiencing this problem - with no improvement.

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  • Ford Master
  • 75,117 Answers

This engine is fully electronically controlled, so you need the dealer to do a full diagnostic of the engine control system, it is the only way to get to the bottom of this. Make sure you can show the dealer exactly what is going on otherwise if they can't duplicate the concern and no fault codes are present they can't fix it.

Posted on Mar 17, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 74 Answers

SOURCE: MAP SENSOR 93 GMC SIERRA 1500 2wd

youare dealing with a spark plug or sparkplug wire thats breaking down causeing a mist thats what your surge is i ypuld change both

Posted on Jul 07, 2008

jonbrown725
  • 73 Answers

SOURCE: 1994 ford ranger extended cab 6 cyl fuel injected 2 wheel drive automatic

This year of ranger had a few flaws, In one case, a break power booster was robbing the vacumm, you can test this by plugging it off and seeing the differance, but you will have limited brakes. This model year had a problem with a vacuum leak on the manifold. You can check these in many ways, but please don't use starting fluid. The rear of the manifold usually on the drivers side where it seals to the block.
Also, in 2 other cases a cracked head has gave me the same problem. It is caused from a loss of vacuum.

Posted on Jan 15, 2009

  • 49 Answers

SOURCE: tow/haul light comes on gauge shows HOT

Does the trans fluid have a burnt smell and is it brown or dark brown as opposed to a red wine color? If this is the case then you may have a service issue caused by a clogged trans filter which is what this sounds a great deal like and the sooner you get the truck to the dealer or your mechanic the better as the trans in these are not cheap to rebuild or replace.

Posted on Aug 21, 2009

Shorty1_wt
  • 324 Answers

SOURCE: P301 Code on 2001 Ford Taurus SOHC (not FFL) with

P0301 Cylinder 1 Misfire Detected

perhaps the coil is weak? or maybe you got a bad plug or wire.

Posted on Jan 23, 2010

  • 92 Answers

SOURCE: We have a 2003 f250 super duty. We have no power

Check fuse #6 20amp on your interior fuse panel it may be blown. The relays are located in an auxillary relay box located under the hood on the drivers side fender near the firewall. The system uses 2 relays. One relay turns on for left turn signal, other relay turns on for right signal. Both relays turn on for brake lamps. The fuse #6 is more likely the problem. If the fuse is blown, replace it, wiggle the wiring on the trailer while someone steps on brakes to check for shorts.

Posted on Apr 06, 2010

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