Like i said check fuel pressure, inspect/clean/replace MAF sensor at the air filter box. Last tune up was? Go with basics first, plug and wires, or in your case with COP(coil on plug) just the plugs. Also Ford has a tech bulliten on a reflash for the compter that can also be your problem, if the truck is still under warranty, have the reflash done, if not, have it done anyway...it's a known drivabilty problem and the reflash is the cure...here:s the bulliten, you decide!
4.0L/4.6L - HARD START/ROUGH RUNNING - AFTER LONG HOT SOAK / DIP IN RPM WHEN COMING TO A STOP - BUILT ON OR BEFORE 4/2/2008 TECHNICAL SERVICE BULLETIN Reference Number(s): 08-9-5, Date of Issue: May 12, 2008 Related Ref Number(s): 08-9-5 ARTICLE BEGINNING ISSUE Some 2006-2008 Explorer 4dr, Mountaineer and 2007-2008 Sport Trac vehicles equipped with 4.0L or 4.6L engine and built on or before 4/2/2008 may exhibit a dip in RPM below normal idle level of 600 RPM on deceleration with no diagnostic trouble codes (DTCs) present or a hard start / rough running condition after a long hot soak. ACTION Reprogram the powertrain control module (PCM) to the latest calibration using IDS release 54.6 and higher or 55.1. This new calibration is not included in the VCM 2008.3 DVD. Calibration files may also be obtained at www.motorcraft.com. WARRANTY INFORMATION WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage. FORD: 2006-2008 Explorer; 2007-2008 Explorer Sport Trac MERCURY: 2006-2008 Mountaineer IMPORTANT: Warranty coverage limits/policies are , not altered by a TSB. Warranty coverage limits are determined by the identified causal part. The warranty calls for a 20 minutes for repair charge!
Friday, November 27th, 2009 AT 8:45 AM