← Misfire / rough running on all engines
Symptoms · 7.3 Power Stroke (1994.5-2003)
7.3 Power Stroke (1994.5-2003): misfire, rough idle, hesitation or surging
4 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: Very common
130 NHTSA owner complaints match it, out of 667 checked
How it shows up
- intermittent stumble then recovery; no warning
Its other signs
- engine dies while driving / no-start, often hot; restarts after cooling
- tach does not move while cranking (the signature tell)
- repeat failures with aftermarket sensors are common
How to tell it apart
- crank and watch the tach: no movement = CPS (the roadside diagnostic)
- check for RPM signal with a scan tool; DTC P0340-family when it sets
- replace with an OEM-quality sensor - cheap aftermarket CPS units are notorious for repeat failure and rough running
Usual fix
replace the CPS (OEM/OEM-quality only; carry a spare in the glovebox - community standard practice)
Recalls and bulletins
07V-553TSB 032148
Root cause, parts and sources →
verified
How widespread: Common
1 NHTSA owner complaints match it, out of 667 checked
How it shows up
- rough running / dead hole(s); misfire that comes and goes
Its other signs
- glow plugs reading dead on a scanner (harness, not plugs)
- melted/burnt connector at the valve cover (9/16' run through the gasket)
How to tell it apart
- scan glow-plug circuit resistance per bank: open circuit = harness or plug, not GPR
- inspect the exterior connectors at the valve covers for melt/looseness
- wiggle-test harnesses while running to reproduce a dropout
Usual fix
replace the UVCH / valve-cover gasket-integrated harness (correct 2-connector OBS or 1-connector 99-03 design)
Recalls and bulletins
TSB 16258
Root cause, parts and sources →
aggregated
How widespread: Common
How it shows up
- no-start or rough hot running; IPR duty pegged high
Its other signs
- ICP erratic vs commanded
- IPR screen found clogged with debris (pump wear or oil breakdown)
How to tell it apart
- scan IPR duty vs ICP actual (high duty, low pressure = IPR circuit or pump)
- inspect the IPR screen when accessible - debris tells you the pump is shedding
- replace o-rings / valve and retest before condemning the HPOP
Usual fix
IPR o-ring kit / replacement IPR valve (fit new screen)
Recalls and bulletins
TSB 032121
Root cause, parts and sources →
verified
How widespread: Occasional
1 NHTSA owner complaints match it, out of 667 checked
How it shows up
- dead/multiple dead holes or no-start with good oil pressure data
Its other signs
- moisture corrosion found at the IDM connector (fender-mounted box)
- DTCs pointing at injector circuit(s)
How to tell it apart
- injector-circuit DTCs + good ICP/IRP data points IDM-side
- swap-test or inspect the IDM connector for corrosion (under-hood fender location takes water)
- check wiring before replacing the module
Usual fix
replace the IDM (rebuilt units common; verify the variant fits the era)
Root cause, parts and sources →
Other symptoms on the 7.3 Power Stroke (1994.5-2003)
Hard start, long crank or no-startLoss of power, limp mode or derateOil leak, oil consumption or rising oil levelTicking, knocking, rattle or whine
Everything on the 7.3 Power Stroke (1994.5-2003)Its recalls and bulletins