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Old 12-13-2012, 01:25 PM
jonKH jonKH is offline
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Join Date: Oct 2012
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Default Random Multiple Missfire @ cruising speeds downhill

Help! Just replaced a 4.0L engine in my 2005 Ranger with one out of a 2011. The truck runs great except when you are cruising down the highway down a hill. It throws random multiple missfire codes - po300 and sometimes different cylinder missfire codes. I had used some of the sensors off the 2011 and just switched them all to the 2005 sensors. Sparkplugs are new, Fuel filter is new. I ran K44 through the injectors to clean them out. Anyone have a clue what would cause it to throw these codes when cruising down a hill at highway speeds?
Some history on the vehicle. The old engine blew and put a lot of oil in the exhaust. It took a while to burn it all out - tons of smoke. It did pass emissions so the cats should be OK.
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2005 Ranger XLT 4WD Supercab 4.0L
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