Posted by scotc on September 16, 2012 at 12:22:35 from (75.235.77.131):
In Reply to: Truck mileage question? posted by Brett Helmkamp on September 15, 2012 at 18:22:17:
Turn the key on-off-on-off-on. If there are any codes stored it should give them to you in the digital odometer. Call the local dealer to see what they are. Some will give codes, others won't.
The Hemi has 8 coil packs and 16 plugs. You could have a bad coil or plug, and wouldn't know it because the other coil/plug are still firing the mix. Plugs would be a good place to start, if you are getting up there in mileage.
The first two (upstream) O2 sensors are what the computer reads to adjust the mix. The other two (downstream) are there to monitor the catalytic converters.
Is it dusty where you live? Before spending money on an air filter pull it out and tap it lightly on something with the engine-side up. See if much dust comes out. Do that til none comes out and see if it helps any. If you use compressed air only blow it on the engine side. If not you can force some of the dirt through the paper. I've also seen air filters that had leaves and twigs and who knows what all sitting on top of them. My sister's neon was so bad it was pulling all it's air in through the PCV system and cam seal. I think she used a gallon of oil per 100 miles til it was found.
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