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Message: [QUOTE="IHPowerstroke7.3, post: 420319, member: 7642"] Shop manuals don't say **** about it, but wiring diagrams state early production has MAF and IAT together in one sensor and Late production have IAT as a seperate sensor. Doesn't list any dates. Well I can't see it being a MAF power circuit issue because it also powers the pcm, glow plug relay module, fan clutch, IPR and a couple other things. If these wire colours are correct, you can check these things. Unplug MAF, key on engine off at Light blue/Red wire you should have 5 volts reference. At the Red wire you should have 12v. Key Off, Check Black/White wire for resistance to ground, should be less than 0.5 ohm. If that checks out okay, key off you can check resistance on the Tan/ Light Blue wire from the MAF to PCM(center pcm connector pin 42. Look closely on inside of connector for pin numbers) Should be less than 0.5 ohm as well. If you don't find anything wrong and your MAF is clean, maybe someone will let you borrow their MAF to test? I can't seam to find a straight answer on what the specs should be. As far as I'm concerned it should be what everyone else stated around 30-40 g/s at idle and over 300g/s on the go pedal. [/QUOTE]

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