Join Date: Jan 2010
Location: West Michigan
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The best way to check your MAF sensor is with a scanner that shows live data. For example the "MASS AIR FLOW (MAF) SENSOR INSPECTION" procedure from ALLDATAdiy.com for my 03 3.0L MTX states:
At Idle ~700-800 RPM's intake MAF should be 3.6- 3.8 g/s and at 2500 RPM's MAF should be 10.5 - 11.4 g/s.
These readings should be taken with the engine warm, in Neutral with the parking brake ON. If you have altered your intake all bets are off and this data may not apply.
I had to replace mine and it took 4 tries to get one that read correctly!!!!! All the others read 5-20% HIGH. I tried ones from NAPA and AutoZone and the only ones they had were remanufactured DENSO's for around $90. Reading high will make your car run rich because it will think it is getting more air than it really is.
SUPERCHARGED 03 6s/07 engine/07 MTX, custom MSDS headers/Magnaflow 34106 cat, Exedy lightweight flywheel, ACT MZ023 heavy-duty pressure plate and ZM6-HDMM Modified Street disc, airbox mod, EGR mod, remote oil filter, (vac/boost, air/fuel ratio, fuel pressure gauges), AWR lower engine mount