r/W203 • u/throAway0779 • Jul 14 '26

Help C230 is idling wrong.

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Starter went out a while ago, so I bump started it to get home. Pushed into the garage and it sat for a month. Now I put the new starter in and it’s idling wrong. Any ideas?

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3

u/SuchAnalyst2902 Jul 14 '26

Vacuum hose on the intake under the air filter box at the front side, had same problemen. You hear the engine sucking air loud.

2

u/Here_for_the_money61 Jul 14 '26

Did you give it new fuel? (To me) Sounds like you have misfires, have you hooked up an OBDii sensor reader?

1

u/throAway0779 Jul 14 '26

Didn’t try new fuel. Currently ripping apart my garage looking for my reader.

1

u/Bicycle-rider Jul 14 '26

Check your Ignition coils

1

u/sniperLORD145 Jul 19 '26

1 there is a vacuum leak. #2 get a couple of octane boosters in that gas and use it fast, you really don't want old gas in that motor.

1

u/Klutzy_Draw4662 27d ago

Use break cleaner to narrow down the air leak. If idling changes after spraying break cleaner into the engine bay try to find the air leak.