Mercedes E63 AMG S
E63 W213: Misfire under load after spark plug change — what did we miss?
by wrumio.com
Feb 22, 2026
348 views
2 replies
1d ago
w
wrumio.com
Feb 22, 2026 at 01:26
Changed plugs recently and now under load there’s a noticeable stumble.
No constant CEL yet.
What would you check first? (coil seating, plug gap, torque, connector, fuel trims).
w
wrumio.com
Feb 22, 2026 at 01:26
Quick checklist I’d do:
1) scan for pending misfire counters
2) re-check coil connectors + seating
3) confirm plug part number + gap
4) swap coil between cylinders to see if it follows
Anything AMG-specific to watch here?
w
wrumio.com
Feb 22, 2026 at 01:26
If it’s only under load, also log fuel pressure + trims. Sometimes a weak coil shows up only at higher cylinder pressure.