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  1. C

    Larger Oil Filter - 07 Limited (4.0) ??

    Just changed the oil in mom's exploder and the filter Ford calls for looks just like the old FL1A Motorcraft filter I used on mom's Thunderbird V8 only shorter by 2-3 inches. I'm a fan of having more oil capacity and more filter and I can't think of any reason this wouldn't work well, can...
  2. C

    MAF Humming

    OK, this is what I did to my 97 4x4 sport that has the SOHC 4.0: Disconnected the negative cable Cleaned MAF and TB with appropriate cleaners Changed air filter Dumped Seafoam into the brake booster vacuum hose Now the MAF is humming, but seems to stop when driving, but at a stop...
  3. C

    Troubleshooting Fuel System

    My 1997 4.0 SOHC 4X4 Sport Automatic (140,000 miles) misfired and the CEL came on. I drove it to Autozone and they put a code reader on and it gave these codes: PO171 PO0300 Mileage went from ~19-20 to 11.5 mpg. I can't really tell that it has lost any performance. This started...
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