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Old 11-21-2020, 01:53 PM   #2
fdryer
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Join Date: Jan 2006
Location: NYC
Posts: 44,891
 

2003 L-Series 3.0L Sedan
Default Re: 2008 3.6 V6 Throttle body/MAF cleaning

I'm presuming all drive by wire throttle/pedal/ecm systems follow the same service manual guidelines on cleaning throttle actuators and maf sensors. My GM service manual states using a solvent soaked rag to wipe off build up in throttle bodies. A strong internal return spring ensures throttle plate closing if power is lost. I removed it when replacing a faulty t-stat, prop open the throttle plate with a wooden parts brush then go at it with a rag. It's not recommended spraying solvent inside throat areas as it may flow into vents, creating electrical issues. The throttle plate is geared to a servo motor commanded by the ecm from pedal signals. My throttle and pedal have a pair of feedback position sensors (four in all). The maf sensor may be housed in a large intake tube with two (tamper resistant) screws. I used small vise grips to grab onto the heads to unscrew them. Coarse threads similar to sheet rock screws replacing nails.

If you can remove the maf sensor from its intake housing, it will make cleaning easier. Use only maf sensor or electrical contact spray cleaner. If the air filter did its job, the maf sensor won't have any noticeable debris.

Be sure ignition is off before disconnecting them from wiring.
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