I sprayed tons of MAF cleaner on my 5.0 to stop it pinging...did squat. Only solution was a brand new MAF. Stuff gets old, coatings wear off...
I'm going to refer people to this post when they start getting crazy about spraying the MAF all the time. I have had two of them go bad not long after spraying them with the correct cleaner. May have been a coincidence, but I would not bet that way.
If a paper filter was always used, you could almost go the life of the vehicle without ever needing to spray one, especially on the cartridge style MAF they used in our 2004 CVPI. Yet guys on the Crown Vic forum talk about spraying the MAF all the time. The way it's positioned in the air stream, it would take 300k miles to get dirty.
Always look at it with a magnifying glass before spraying.
97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles