Stalls at idle
Engine catches and runs but dies at idle, especially at stops or when A/C engages.
Idle is mechanically set on M117 with electronic trim. A stall usually means either no fuel-air compensation (IAC, EHA) or a sudden vacuum leak.
What the diagnosis checks
- Does it stall the moment A/C engages?
- Does the engine stall only after a long highway drive?
Possible causes it points to
- A/C idle-up valve / kick-up
- Fuel pressure regulator leaking warm
- Idle-air-control valve stuck closed
Parts for this job
KE-Jetronic fuel system sparesBackground reading
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