ML 320 ECU ISSUES
05-25-2015, 10:52 PM
#1
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ml320
ML 320 ECU ISSUES
Hi I'm new to the mercedes world. I have a 1999 ML320. Up until recently I had a couple of emission issues. I replaced a couple of O2 sensors as per my OBDII readings. After doing one of the replacements I had cleared the codes and left the truck running to get it back up to operating temperatures. Unfortunately I forgot the truck was running and left it overnight(app. 11.5 hours)
I am no longer getting any codes and have a very long warm up period before the truck will even drive. I have found by opening up the air box it limits the misfires and idles much smoother.
Some of the things I have done since are:
1. Cleaned the EGR valve
2. Cleaned the MAF sensor
3. Cleaned the secondary air pump baffles.
It will sometime give me a check engine light but when I check for codes it tells me there are none. I borrowed a better tester and was getting 6 incompletes. Have I screwed up the ECU?
The truck runs fantastic when its warmed up but misfires and idles so low until it stalls unless I open up the air box. I bought this truck cheap and don't want to invest a lot of cash into it. Any suggestions would be greatly appreciated.
I am no longer getting any codes and have a very long warm up period before the truck will even drive. I have found by opening up the air box it limits the misfires and idles much smoother.
Some of the things I have done since are:
1. Cleaned the EGR valve
2. Cleaned the MAF sensor
3. Cleaned the secondary air pump baffles.
It will sometime give me a check engine light but when I check for codes it tells me there are none. I borrowed a better tester and was getting 6 incompletes. Have I screwed up the ECU?
The truck runs fantastic when its warmed up but misfires and idles so low until it stalls unless I open up the air box. I bought this truck cheap and don't want to invest a lot of cash into it. Any suggestions would be greatly appreciated.
05-26-2015, 02:50 PM
#2
Super Member
Welcome to the forum.
Start by changing you air filter & have the car scanned with a pro level scanner. Post the codes after scanning with a pro level scanner.
Have you bought bosch O2 sensors?
Start by changing you air filter & have the car scanned with a pro level scanner. Post the codes after scanning with a pro level scanner.
Have you bought bosch O2 sensors?
