Join Date: Mar 2010
Location: Stockbridge, Mi.
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I just picked my truck up from the dealer yesterday, it had been in for a similar problem. Actually this was the second time to the dealer in the last 2 weeks for the same problem
Mine had a shudder/stutter or I guess you could call it a miss, but it was around 2000rpm and up, when accelerating or under load. I was sure it was a bad injector.
(excuse me if I don't get all the terminology right when I explain what they did)
First time they diagnosed a HPOP pressure fluctuation and changed out both oil feed pipes to the oil rails and the dummy plugs (said there was a new design with the check valves relocated). This did reduce the problem but it wasn't completely gone, so after driving it for a week I scheduled another appointment.
Yesterday when I picked it up (and went out and talked to the diesel tech), he said it still was a problem related to the high pressure oil system, this time they diagnosed a faulty IPR (injection pressure regulator) he said it apparently was not holding constant or correct oil pressure and was letting it fluctuate.
In any case on the drive home there was no sign of a miss or stutter, time will tell.
2006 F-450 XLT 4x4 Auto 4.30L Alcoa 19.5" 16,000 GVWR
Kelderman 4-Link/4-Bag Rear Suspension, Lariat Seats, '08 Console, '11 Mirrors, CTS, SCT X3
ARP's w/OEM HG, BPD 6ph FICM @ 58v, BPD Oil Cooler w/stat, Ported Intake, 185 amp Alt
P-Max w/WPE billet wheel, Spearco IC, 4" Banks Exhaust, Shell T6, Zerex EC-1, Oil bypass filter