Compression Ignition Addict
Join Date: May 2010
Location: Bismarck, ND/Ft Riley, KS
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15 secs is not too long. Its the real short ones that are of a big concern.
From the discription I would think you have a bad glow plug or two and possibly even an air intrusion, most likely in the return lines.
Do the return lines have any fuel on them that would indicate a possible leak?
I would definately check the glow plugs first. This is a good test for the glow plugs themselves (each glow plug should be tested individually with the the wire disconnected):
Using a test light you want to disconnect the glow plug wire connection, connect the light to the positive side of the battery and then touch the other side to the glow plug connection. If the light comes on you are good. Otherwise they need to be replaced.
Hope this helps!
2003 F350 6.0 4x4 Crewcab Longbed SRW w/X Code Front Springs- 265/75R16's on it now. Still got the 285 retreads in the shed though.
Future modifications: Edge Insight CS, SCT X3 with Custom Tunes
1994 F350 7.3 Banks Turbo IDI 4x4 Crewcab Longbed-Miss you old girl