how do you know if your mass airflow sensor is bad?
Feb 16, 2017 at 4:06 PM
mass airflow sensor
2002 MERCEDES BENZ ML500
SHAUFER1
- MEMBER
- 1 POST
Advertisement
CARADIODOC
- ✓ASE Certified Mechanic
- 34,321 POSTS
Based on the symptoms and/or diagnostic fault codes.
Feb 16, 2017 at 4:10 PM
JIS001
- ✓ASE Certified Mechanic
- 3,412 POSTS
Usually vehicle is pretty good at posting a fault code for it. But to check it using a scanner with live data here is how to check it.
Verify there are no vacuum leaks. If okay look at mass air flow data and set for grams per second. In theory since you have a 5.0L you should see close to 5g/s but maybe a little higher lime 6-7 at idle with loads off.
If okay take vehicle up to 45 mph then hut the gas to wide open throttle for a second or two. Reading should be 100 or higher. If all is good then mass air flow is working properly. If not much of a change then it is most likely faulty.
Hope info helps you out.
Verify there are no vacuum leaks. If okay look at mass air flow data and set for grams per second. In theory since you have a 5.0L you should see close to 5g/s but maybe a little higher lime 6-7 at idle with loads off.
If okay take vehicle up to 45 mph then hut the gas to wide open throttle for a second or two. Reading should be 100 or higher. If all is good then mass air flow is working properly. If not much of a change then it is most likely faulty.
Hope info helps you out.
Feb 16, 2017 at 9:30 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.