Fault-Tracing Information

Condition(s)
- diagnostic trouble codes (DTCs) in Motronic 4.4 absent.
- diagnostic trouble codes in AW 30-40/43 transmission.
- control module (TCM) absent.
- engine at normal operating temperature.
- the fault is permanent.

Possible source(s)
- ignition retardation due to knock.
- damaged ignition coils.
- blocked air cleaner (ACL)/air intake.
- uneven compression.
- low fuel pressure.
- blocked exhaust system.
- faulty sensor signals.
- start fault-tracing. Proceed to: Checking Air Intake.