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Solution Found! Amazing what parts suppliers are doing these days. The problem was in the new supposedly Delphi brand o2 sensors. Although they came to me in a box labeled Delphi, they are in fact counterfeit parts. After making a custom harness to connect a multi-channel digital oscilloscope to...

More issues, no resolution. Anyone? The Explorer is still having issues. Actually they are getting worse. I have been driving it and watching sequence of symptoms and codes when it starts misfiring. Keep in mind that all of the runability issues have appeared since fuel pump replacement...

Still no solution. So far have replaced: fuel pump (2x), MAF, TPS (x2), IAT sensor, Cam position sensor, Crank position sensor, both upstream 02 sensors, FPR, coil pack, plugs & wires, egr solenoid, EGR sensor, upper intake manifold gaskets, all vacuum hoses, CATCON, ECU, IAC valve (x2), fuel...

Update! I went back to the basics and did a vacuum leakdown test again, this time with engine hot. Surprise! Leaks at base of plenum when hot, but not when cold. I replaced plenum gaskets, and all vacuum lines (since they were all brittle). Bigger surprise! Absolutely no change in how it runs...

Thanks for the input. FPR keeping pressure at a flat 28-30 psi regardless of rpm or throttle opening. Disconnected (and plugged) vacuum line with no change of pressure. Swapped another fpr and pressure now is 33-34 psi at idle, but spikes to about 40 then drop backs to 33-34 when the throttle is...

My 1997 Explorer XLT manual trans and 1354M transfer case with 185K miles started throwing codes 1130, 1131, 1132, 1150, 1151, and 1152. Ran fair, but rough idle and flat/weak power. Shortly after it would not start. Diagnostics showed no fuel pressure, electrical ok. Installed new OEM brand...