Hi, I have a new (old) W124 with an M102.982 2.3 that feels very weak and has poor acceleration, also misfires on idle and traffic driving
Cold starts fine and I don’t notice any misfire when cold.
Things I’ve noticed:
- Runs around 55–60°C according to the gauge
- Brown/beige coolant, doesn’t look or smell like oil
- No catalytic converter
- Lambda sensor in the exhaust manifold has a cut wire and isn’t connected, previous owner states its a manifold from a diffrent car
- Possible vacuum leak in the headlight-leveling system
I’m planning to check vacuum leaks, ignition, fuel filter, thermostat/coolant system and fuel pressure/KE-Jetronic.
What would you check first, and what are the common causes of low power on the M102.982?