What is the procedure for testing the maf?

2004 FORD EXPEDITION
125,000 MILES • 5.4L • V8 • 2WD • AUTOMATIC
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RDRAINER
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Code P0171 and P0174. I cleaned the maf with proper cleaner also changed air and fuel filter. Would like to like to test the MAF to verify it is working properly but need procedure to do so. Thank you for any help or info.
Feb 22, 2014 at 8:50 PM
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SATURNTECH9
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  • 30,869 POSTS
I would be looking for a vacuum leak the number one thing I have seen cause those codes on the fords are vacuum leaks. I would check actual fuel pressure and for vacuum leaks if you reset the codes how quickly will the code reset?
Feb 22, 2014 at 11:22 PM
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RDRAINER
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Thank you!!!! I took plastic cover off of intake and found not 1 but 2 vacuum leaks near the back of the intake.This should fix the problem and thank you for the info.
Feb 23, 2014 at 8:02 AM
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SATURNTECH9
  • ✓Experienced Mechanic
  • 30,869 POSTS
Your welcome also check the pcv hose and grommets for leaks also pretty common.Your welcome glad I could help.
Feb 23, 2014 at 10:42 AM
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