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#1
04-20-2011, 12:22 PM
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FORD's SELF-DESTRUCTING 4.0L V-6
MY 99' Ford Ranger is having trouble at 99K. (So did my last one, a 2000, at 94K, whose heads warped and cracked without notice, or overheating, only a once a month slight need to add water)
ENG LIGHT is ON... Trouble codes are: P0171 - Fuel trim bank, one position (rich or lean bank, O-sensor, injector, misfire, fuel pressure, MAF P0174 - Fuel trim bank, two position (MAF, fuel pressure, O-sensor, misfire, injector, or engine mechanical PO304 - Misfire cyl 4, (plug, wires, vacuum, injector, hi/lo fuel pressure) P1507 - Idle-Air-underspeed error (possible vac leak, IAC valve, Inlet plug, open or shorted electrical circuit To get through emmisions, I added 4 bottles of Heet, and one Octane Booster and it ran fine. The check engine light even went away on it's own.  Where would you start? My only symptom really is rough at cold starts, takes a long time to warm up, runs smooth over 2,000 RPM when warm, and almost normal below. Your two-cents worth please: 
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