2000 Mercedes Benz ML320 MASS AIR FLOW SENSOR

Tiny
RPSTARR
  • MEMBER
  • 2000 MERCEDES BENZ ML320
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 110,000 MILES
CHANGED MASS AIR FLOW SENSOR WHEN CAR ALMOST STOPPED RUNNING AND THREW CODE SHOWING MALFUNCTION IN MASS AIR FLOW SENSOR CIRCUIT - THOUGHT PROBLEM SOLVED - BUT CHECK ENGINE LIGHT IS BACK ON - SHOWS MALFUNCTION IN FUEL TRIM BANKS 1 & 2. AT FIRST THE CHECK ENGINE LIGHT WOULD GO OFF AFTER RUNNING THE CAR 3 OR 4 TIMES. NOW IT IS STAYING ON - SAME CODES - occasionally has a slight shudder at idle - DID I GET A BAD MASS AIR FLOW SENSOR?
Thursday, June 10th, 2010 AT 3:08 PM

5 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Would you post code in P0xxx format so I may acess info for causes?
Thanks for donate
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Monday, June 14th, 2010 AT 9:43 AM
Tiny
RPSTARR
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  • 10 POSTS
THE CODES WERE PO170 - FUEL TRIM MALFUNCTION (BANK 1) AND PO173 FUEL TRIM MALFUNCTION (BANK 2)
THESE CODES APPEARED AFTER I CHANGED THE MASS AIR FLOW SENSOR.
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Monday, June 14th, 2010 AT 10:18 AM
Tiny
DOCFIXIT
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Was code P0100 present before replacing MAF? Recheck the instlation most common cause for 170-173 together is intake leak
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+1
Monday, June 14th, 2010 AT 10:51 AM
Tiny
RPSTARR
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YES PO100 WAS PRESENT BEFORE REPLACING THE MAF - CHECKED INSTALL ON MAF AND IT APPEARS TO BE PROPER - CHECKED BELLOWS AND COULD FIND NO CRACKS OR SPLITS - ANY WAY TO CHECK FOR LEAKS?
PROBLEM STARTED DURING WINTER - HAD TO WARM UP A LITTLE BIT OTHERWISE IT WOULD BOG DOWN - THEN ABOUT A MONTH AGO (WHILE DRIVING) IT STARTED BOGGING DOWN AND I ALMOST DIDN'T MAKE IT HOME. RAN THE CODES AND CHANGED THE MAF. EVERYTHING APPEARED TO BE FINE AND THEN 170-173 APPEARED AFTER SEVERAL DAYS. RAN THE DATA ON MY SCANNER AND IT SHOWS INTAKE AIR TEMPS THAT SEEM VERY HIGH (130-150)- THE TEMP HERE HAS BEEN IN THE MID 90'S !
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Monday, June 14th, 2010 AT 12:22 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Have fuel pressure tested maybe faulty diaphram pressure regulator lowering fuel pressure
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Monday, June 14th, 2010 AT 12:52 PM

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