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Symptoms · 6.4 Power Stroke (2008-2010)
6.4 Power Stroke (2008-2010): hard start, long crank or no-start
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
22 NHTSA owner complaints match it, out of 133 checked
How it shows up
- sudden hard start / no-start with a sound change at the pump
Its other signs
- fuel system contamination: pump shrapnel travels to ALL 8 piezo injectors
- metal filings at fuel filters; injection DTCs across multiple cylinders
How to tell it apart
- any no-start: sample fuel at the rails/filters for metal BEFORE cranking more (each crank spreads shrapnel)
- scope the repair: pump + injectors + lines/rails flush as one decision, not a pump swap
- document ULSD-only requirement - early-life fuel contamination stories cluster pre-ULSD
Usual fix
full repair set: replacement pump + all 8 injectors + complete fuel system cleaning (the only safe scope after shrapnel)
Recalls and bulletins
TSB ASI-22198TSB SB-21434
Root cause, parts and sources →
verified
How widespread: Common
6 NHTSA owner complaints match it, out of 133 checked
How it shows up
- white smoke, coolant loss, then the classic: no-crank hydrolock after shutdown (cooler drips into #8 overnight)
Its other signs
- EGR cooler DTCs; coolant smell at the exhaust
- worst case: bent rod from a restart attempt on a locked cylinder
How to tell it apart
- block-test the coolant; inspect the EGR cooler/intake for coolant traces
- ANY no-crank-after-shutdown on a 6.4: suspect hydrolock BEFORE cranking - pull a plug/injector and check for fluid
- track coolant loss history; do not keep topping up
Usual fix
replace the EGR cooler immediately when leaking; inspect #8 for fluid before restart
Root cause, parts and sources →
Other symptoms on the 6.4 Power Stroke (2008-2010)
Loss 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 whineMisfire, rough idle, hesitation or surging
Everything on the 6.4 Power Stroke (2008-2010)Its recalls and bulletins