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Old 06-06-2012, 12:31 AM
joshuajeeper joshuajeeper is offline
85 300TD
Join Date: Jul 2006
Location: Cameron Park, CA
Posts: 124
A really common problem on m272 and m273 engines caused by someone not installing the air filter box correctly which can cause the rear seal (which goes onto the mass airflow sensor) to not sit correctly or tear the seal. This will cause the check engine light to come on with a short and/or long term fuel trim code at part throttle. And if you are still having a cold starting issue AFTER they replaced the seal, then it sounds like they may not have reset the fuel trim adaptation values after replacing the seal and the computer is trying to over compensate. Or it may be something completely unrelated, which is always a possibility.
1985 300TD - "Panzer Wagen" - undergoing full restoration (resto - mod)
2014 GLK250 Bluetec - Wife's car

Mercedes-Benz Master Certified Technician.
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