← Misfire / rough running on all engines

Symptoms · Triton (gas)

Triton (gas): misfire, rough idle, hesitation or surging

5 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.

Spark plug ejection / stripped plug threads (2V heads) Very common · 105 complaints · 1 recall/bulletin
Cam phaser rattle / VCT noise (5.4L 3V) Very common · 87 complaints · 1 recall/bulletin
Ignition coil (COP) failure / misfire Very common · 55 complaints · 4 recall/bulletins
EGR system faults / DPFE sensor failure (gas) Very common · 23 complaints · 3 recall/bulletins
Timing chain / tensioner / guide wear (2V) Common · 16 complaints

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.

1 Spark plug ejection / stripped plug threads (2V heads)

verified How widespread: Very common 105 NHTSA owner complaints match it, out of 7,111 checked

How it shows up

misfire with a ticking/chuffing noise at one cylinder; plug wire pops off

Its other signs

a spark plug blows out of the head under load ('shot out like a bullet')
plug threads stripped in the aluminum head after a plug change

How to tell it apart

confirm which cylinder and whether the plug or the threads failed
borescope / thread inspection of the seat; check the plug for stripped threads vs sheared shell
if ejected: inspect the coil boot and the seat for debris before the repair

Usual fix

chase and insert-repair the seat with a thread-repair kit (Time-Sert / Calvan class) and install a fresh correct plug

Recalls and bulletins

TSB 07-21-2

Root cause, parts and sources →

2 Cam phaser rattle / VCT noise (5.4L 3V)

verified How widespread: Very common 87 NHTSA owner complaints match it, out of 7,111 checked

How it shows up

rattle at hot idle, occasionally with a rough first few seconds

Its other signs

a loud diesel-like rattle on cold start that fades as oil pressure builds
timing/cam DTCs (P0011/P0012 family) with the rattle
check-engine light with cam timing codes

How to tell it apart

confirm the noise is at cold start and fades with oil pressure (phaser signature)
scan for cam-timing DTCs; check VCT solenoid operation
oil condition first - sludge both causes and mimics phaser noise

Usual fix

replace the phasers (in pairs) with the timing chain kit while the front end is open; check VCT solenoids

Recalls and bulletins

TSB 04-24-24

Root cause, parts and sources →

3 Ignition coil (COP) failure / misfire

verified How widespread: Very common 55 NHTSA owner complaints match it, out of 7,111 checked

How it shows up

random cylinder misfire (P0300-P0308), worst in moisture/cold
rough idle that follows a specific cylinder; flashing MIL under load

Its other signs

cracked coil boot with carbon tracking down the plug well

How to tell it apart

swap the suspect coil to another cylinder: does the misfire follow? (classic COP bulletins' method)
inspect the boot for carbon tracking; check the plug while the coil is out
scan which cylinder; moisture-correlated misfires point to boots/tracking

Usual fix

replace the failed coil(s) with the correct generation (DG-508 2V / DG-511 3V) and any tracking boot

Recalls and bulletins

SSM 46542 TSB 04-16-01 TSB 03-14-04 TSB 03-14-4

Root cause, parts and sources →

4 EGR system faults / DPFE sensor failure (gas)

verified How widespread: Very common 23 NHTSA owner complaints match it, out of 7,111 checked

How it shows up

P0401 (insufficient EGR flow) / P0402 (excessive) with rough idle
non-commanded EGR flow - rough idle that comes and goes

Its other signs

knock under load on an otherwise healthy engine

How to tell it apart

scan the EGR DTC family; command the valve with a scan tool and watch flow
inspect the DPFE hoses/orifice tubes for carbon blockage before replacing the sensor
clean-vs-replace the valve: sticking valves often recover; leaking diaphragms do not

Usual fix

replace the DPFE sensor (match by year) and clear the orifice tubes

Recalls and bulletins

TSB 05-4-17 TSB 05-3-1 TSB 17-5-68

Root cause, parts and sources →

5 Timing chain / tensioner / guide wear (2V)

aggregated How widespread: Common 16 NHTSA owner complaints match it, out of 7,111 checked

How it shows up

slow cam-timing drift codes; rough running after oil changes are NOT the fix

Its other signs

slap/rattle noise that worsens warm, not just cold
metal/plastic debris found during an oil change

How to tell it apart

listen for warm-engine slap vs cold-only rattle (chain vs phaser signatures)
inspect chain slack / guide wear with the front cover open on a related job

Usual fix

timing chain kit (chains, tensioners, guides) when the front end is open for any related job

Root cause, parts and sources →

Other symptoms on the Triton (gas)

Ticking, knocking, rattle or whine

Everything on the Triton (gas)Its recalls and bulletins

Order: how widespread each failure is in its record (near-universal, very common, common, occasional, rare), then the number of NHTSA owner complaints that match its keywords. Complaint counts are keyword matches, not a manual review of each complaint. A symptom listed here means the failure is documented with that sign; it is not a diagnosis of your truck. Tiers: verified, aggregated, contested, data-gap. How we tier and source facts.