Question about 2004 Ford Escape

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2004 escape 3.0L miss-firing. Had tune-up, ford replaced injector and wanted me to pay $800 for a PCU since their fix didn't do it. Found one on internet for $300 programmed. Installed it. Still have P0351 error. I'm assuming a broken wire because I don't see how a coil could go bad. Any help troubleshooting would be greatly appreciated since I can't afford to have Ford charge me for another part that isn't going to fix the problem. I've already spent $1300 and if I could I would call St Vincent de Paul and donate it.

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P0351 indicates either a damaged PCM, a damaged coil, or a open or shorted circuit. Being that you already replaced the PCM I would assume its not that unless you were very unlucky and bought a damaged one. If its a open or shorted circuit it will be a little harder to find. You can try and do a visual inspection of the wires but you won't be able to see much being that most of them are wrapped in bundles. If you had a multimeter, wiring diagrams, and knew what voltages/watts/ohms ran threw each wire you could try and trace an open or shorted circuit but without I don't think you'd have much luck. Odds are that it is a damaged coil(P0351 indicates Cylinder #1 I believe). They handle large amounts of current that over time may cause damage and cause them to fail. It is much more common for a coil to fail than a PCM failing or there being a damaged circuit. But being that you have to remove the upper intake to get at them there is no real easy way to test them. The only other thing I can find only applies if you live near salt water. Its possible that salt water has gotten into the CKP(Crankshaft Position) sensor harness. You have to thoroughly clean the harness and apply di-electric grease and if that doesn't work replace the CKP sensor itself.

Posted on Mar 24, 2011

Testimonial: "This problem is intermittent. I did find out that the 1st PCM was giving me a P0301 error and the 2nd gives me a P0351. I can't find the difference."

  • Scott Kirkwood Mar 27, 2011

    P0301 indicates a misfire in cylinder#1 while P0351 indicates an ignition coil primary/secondary circuit malfunction in cylinder#1.

  • jellis1947 Mar 30, 2011

    Thanks to those of you who helped me. I did fix it by repairing a broken wire from pin 26 of the PCM to #1 COP. I noticed that the wire had a crimp in it about an inch from where it connects to the connector.

    I found this on another site: This is a copy of text taken off of Ford's web site:

    2001-2003 ESCAPE 3.0l - INTERMITTENT MIL ILLUMINATION AND/OR P0301 OR P0301 SOME 2001-2003 ESCAPES WITH THE 3.0L DURATEC ENGINE MAY EXHIBIT AN IN INTERMITTENT MALFUNCTION INDICATOR LAMP (mil) ILLUMINATION AND/OR TROUBLE CODE (DTC) P0301 OR P0351. IF NORMAL SERVICE DIAGNOSTICS FAIL TO ISOLATE THE ROOT CAUSE, CHECK FOR THE POSSIBILITY OF DAMAGED WIRING IN THE 12A522 HARNESS AT THE 104-PIN POWERTRAIN CONTROL MODULE (PVM) CONNECTOR. CHECK FOR DAMAGE TO THE LIGHT GREEN/WHITE CIRCUIT 1024, PIN 26 AT THE PCM CONNECTOR. LOOK FOR SIGNS OF DAMAGE AT THE FEMALE TERMINAL OR TO THE WIRING INSULATION. SERVICE AS REQUIRED. REFER TO THE 2001 ESCAPE WIRING DIAGRAM SECTION 303-078-00 FOR ALL MODEL YEARS.

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