2003 bucking up hill and loosing boost...... - Ford Powerstroke Diesel Forum
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Old 05-10-2013, 11:54 PM
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Question 2003 bucking up hill and loosing boost......

Was pulling about a 6% grade after about 1:30 of driving through the hills in my 2003 ex when it started bucking like maybe there was a miss. All my gauges looked good and no engine lights except my boost would drop from around 17 psi to 10-12 at each buck or miss or whatever it was. I'm not really sure what it was since I'm new to my diesel having issues.

The coolant, filters and everything has recently been changed and my deltas have been a solid 9 degrees. I have been running the ford cetane booster for the past 1500 miles too. And I have replaced the coolant cap with the updated ford part. This was my first real test running it through the hills so I'm at a loss.

It has been having the 50-75 rpm surge at idle though once hot. So any questions? The rig has about 96k miles on it. Thanks!!!
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Old 05-11-2013, 12:23 AM
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I have a 03 as well mine was Bucking alot my going about 45 miles an hour finally one cold snowy day here in Colorado I was driving the hill and it just lost all power died I restarted it still have no power looks like I'm in for a HPOP replacement

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Old 05-11-2013, 08:52 AM
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So is this typical of the bucking to indicate an hpop failure? Anyone know what the typical cost is to have the dealer replace it?
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Old 05-12-2013, 02:05 PM
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Just checked the fcim and its holding a solid 47.5.... Thinking hpop or a leak in the hpop circuit.
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