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So I've been having trouble running lean lately and everytime I think I have it licked.... it rears its ugly head a little differently. As of the last 2 days it predictably runs slightly rich in the morning when it's cool outside, and super lean right about noon when it's in the 80s. Just...

Using my SCT X4 to monitor a few things I'm noticing that my fuel trims at idle are lean. While driving around they hover right around "1.00" +/- .03. However when I come to a complete stop they nosedive to "0.80" , then go back up once I start driving. 1999 Explorer 4.0 SOHC, Car is running...

So I had a custom tune done for my explorer and it came on the SCT X4. While datalogging I noticed that my fuel pump duty cycle stays at 1%.....always. Is there a sensor or relay associated with this? Sign of a failing fuel pump? Thanks in advance.

My throttle cable is stretching.....I've gone from 1 zip tie to keep it taut to 3 in the last 6 months. I can't seem to find a replacement anywhere, OEM or aftermarket. XL2Z9A758AA is the part number but obviously has been discontinued. Can anyone point me in the right direction?

Sooooo....I have been fixing up this old explorer. Started with a K&N Filter, Ford racing throttle body and swiss cheese mod on the air box. After putting the Screamin Demon Coil pack, plug wires, and new plugs in, everything ran great. Much smoother. This past Weekend I put Gibson headers and...

While changing rear differential fluid I found this black box with "To cannister" followed by an arrow written on it. What is it and do I need to fix it because it looks disconnected. Thanks in advance.