1987 F-250 5.8L 351w trouble code description 98 hard fault


Asked by Nov 03, 2015 at 12:17 AM about the 1987 Ford F-250 XLT Standard Cab 4WD LB HD

Question type: Maintenance & Repair

other codes: 51,53- ECT open circuit, 54 - TP above range, 22 - BP out of self test range.   also unsure of last code, and cannot perform KOEO test  apparent fuel in oil after oil change 5.8L 351w MT

1 Answer


Track down your gas in the oil first, most common is a leaking fuel pressure regulator, pull off the vacuum line on the top and just turn on the key and watch for fuel squirting out the regulator there, you also have a common code 22 failed MAP sensor, you can perform the resistance test if you want too but these are so common I would just replace it, code 51 engine coolant temp sensor too high, this one could be just a bad sensor or resistance in the ECT circuit, 53 Throttle position sensor too high, this one could be just a dirty throttle body holding the air plate open too much, clean the throttle body first before condemning the sensor, code 54 Intake Air Temperature sensor signal too high, most of these are just a bad sensor, usually they are all crudded up and can't work, you will see that when you remove it. Go to: http://www.troublecodes.net/Ford/

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