Hi,
I have a 2001 Mercedes ML320 with 180k miles. She ran perfectly up until last month, when she began stalling whenever the engine revs low. I got it diagnosed by a Mercedes mechanic, resulting in error codes for the Throttle Positioning Sensor, the Air Mass Flow Sensor, and the Coolant Sensor. I replaced the Throttle Sensor, but the stalling problem remained. I want to try and save money fixing this myself, what do you guys think needs to be done?

 

[QUOTE=mgcorrei;166378]Hi,
I have a 2001 Mercedes ML320 with 180k miles. She ran perfectly up until last month, when she began stalling whenever the engine revs low. I got it diagnosed by a Mercedes mechanic, resulting in error codes for the Throttle Positioning Sensor, the Air Mass Flow Sensor, and the Coolant Sensor. I replaced the Throttle Sensor, but the stalling problem remained. I want to try and save money fixing this myself, what do you guys think needs to be done?[/QUOTE






I would check the EGR valve, probably with that mileage its carboned up, also the EGR tube gets clogged up. Check the combination valves too, they also carbon up. Be careful because usually when you remove them from the intake, they break at the very bottom of the seating surface.
if you had a mass airflow sensor code you could have a vacuum leak. or the intake manifold gaskets leak.


You could just need a tune up, or maybe the cats are starting to clog up.

 

its not indicative of any transmission problem? As soon as its warm outside it usually starts stalling, drives fine after sunset.

 

This is actually for a ML I am strongly considering buying for $2400 and fixing up. You think its a good deal ? How many miles can people usually get out of these? Looks super clean in the pics

2001 Mercedes ML 320 TOP DEAL