C320 runs smooth cold rough hot
02-01-2013, 12:44 AM
#1
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C320 runs smooth cold rough hot
My 2003 C320 runs perfectly when cold, but when it warms up it starts to run rough, and will sometimes stall or almost stall at a stop. It has 115000 miles. I've changed the plugs. I figure it's got to be a sensor that kicks in after warm-up. Check engine light came on for a couple of days then went out. Haven't read the codes yet. Seems to run smooth at high speed (60-70mph). Any ideas?
02-01-2013, 10:48 AM
#4
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Lots of info on forum,.... search,... or just go to your local Mercedes-Benz Stealership and have them fix it,.....
02-01-2013, 09:20 PM
#7
Super Moderator
Please check for stored codes. It can be a whole host of things.
What symptoms tell me is that it is stable open loop with enriched mixture but rough in closed loop. Have you cleaned the MAF? Could even be dirty injectors or an 02 sensor.
What symptoms tell me is that it is stable open loop with enriched mixture but rough in closed loop. Have you cleaned the MAF? Could even be dirty injectors or an 02 sensor.
