I haven't elimiinated any of the above. I'm a bit of a newb, but I'm very capable of moderate repairs/maintenance.There are tons of things that can affect MPG. The state of maintenance on the engine in general, spark plugs, O2 sensors, catalytic converters, MAF sensor, clogged intake or throttle body. What possibilities have you eliminated?
Thanks!1. Absolutely check and replace the plugs with OEM spec, you're due.
2. Open and inspect the air intake box and filter. Remove the filter and look for clogs, install new OEM paper filter if necessary.
3. Pull the MAF sensor and visually inspect the filament for crud (do NOT touch the filament, buy a dedicated touchless MAF cleaner spray).
3. Open and inspect the throttle body. Spray a rag with throttle body cleaner and thoroughly clean it out if dirty.
4. Add a bottle of techron injector cleaner to a half tank of gas and drive the car aggressively to clean out ports and injectors.
Techron injector cleaner:
CRC MAF Cleaner
Amazon.com: CRC 05110 Mass Air Flow Sensor Cleaner - 11 Wt Oz.: Sports & Outdoors
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CRC Throttle Body Cleaner
Amazon.com: CRC 05078 Throttle Body and Air-Intake Cleaner - 12 oz.: Sports & Outdoors
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Is there any difference between O2 sensors? I'm seeing a Bosch @ $140 and a Walker @ $125. Does the extra $15 make a difference?At 96k your due for plugs. Change the O2 sensors also, use only AC plugs and sensors, the upstream sensors that are closest to the engine as they control fuel mixture. There is no looking at the sensors to see how they are like a spark plug. O2 sensors get lazy / slow responding as the miles go on.
I've gotten back 2-3 mpg on putting in fresh O2 sensors.
Clean MAF
We all have been down this road and this is what has worked for us.
NOT using the gauge cluster. I track my mileage and calculate mpg everytime I fuel up.What are you basing your fuel economy estimates on? If you're using the gauge cluster average readout, have you reset it since doing all the work?
I'm not sure at this point. I have replaced the EVAP solenoid/valve (at manifold) and upstream 02 sensor.What are "potential" ussues withe EVAP and O2 sensors? I suggest you take care of the EVAP problems first.
Thank you! Do you know if they can be gotten to w/o lowering the tank?Cannister is in the bottom right of both of these photos, passenger side, forward end of tank. Photos are from a 2006 LS, not an SS.
