← Misfire / rough running on all engines
Symptoms · 6.4 Power Stroke (2008-2010)
6.4 Power Stroke (2008-2010): misfire, rough idle, hesitation or surging
2 documented failures on this engine list this among their signs. They are ordered from the most widespread down. Each one shows the signs in its record's own words, how to tell it from the others, the usual fix and any recall or bulletin.
Not sure which engine you have, or want the recalls for your exact truck? Check your VIN: it names the engine and lists the campaigns for that model year. Whether a recall is still open on your VIN: nhtsa.gov/recalls.
verified
How widespread: Common
8 NHTSA owner complaints match it, out of 133 checked
How it shows up
- rough running / power loss on #7 or #8; engine replacement conversations
Its other signs
- oil consumption rising; blue smoke
- fuel-diluted oil history (failed regens) precedes it
How to tell it apart
- track oil level/consumption trends; lab oil analysis for fuel %
- cylinder-balance test + compression/leak-down when a hole drops out
- inspect for failed-regen patterns (aborted regens, city duty) before blaming hardware
Usual fix
engine-level decision: reman/used long block vs rebuild with upgraded rings/pistons (state cost tier explicitly in recipes)
Root cause, parts and sources →
aggregated
How widespread: Occasional
How it shows up
- misfire/overheat events; head-gasket-adjacent symptoms without gasket failure
Its other signs
- coolant loss/combustion gas in cooling system on tuned trucks
- history of aggressive tuning (advanced timing) nearly universal in the stories
How to tell it apart
- block-test + cooling-system pressure-rise test; borescope leak points
- correlate with tune history before condemning hardware
- leak-down per cylinder once a head is suspected
Usual fix
reman head / engine-level decision; return to conservative timing; upgraded studs/studs-and-gasket at rebuild (state cost tier)
Root cause, parts and sources →
Other symptoms on the 6.4 Power Stroke (2008-2010)
Hard start, long crank or no-startLoss of power, limp mode or derateBlue or gray smoke (burning oil)Losing coolantOverheating or temperature creeping upOil leak, oil consumption or rising oil levelTicking, knocking, rattle or whine
Everything on the 6.4 Power Stroke (2008-2010)Its recalls and bulletins