Question about 1988 Ford Ranger

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Runs rough poor gas milage - 1988 Ford Ranger

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There is a fuel pressure regulator on the fuel rail, and thats where the fuel return line hooks to. On that fuel pressure regulator is a vacuum line. Pull that vacuum line off the regulator and see if it is wet inside with gasoline. If it is not, and its dry, hook it back up. If it DOES have gas in the vacuum line, then there is a hole in the regulator diaphragm and the regulator needs replacing - simple task and $25-$100 depending on which one they used on your model truck. If this IS the issue - It is critical you replace the engine oil and filter , then again after 10 to 20 miles to get the gasoline our of the crankcase. Very important to engine life.

If not the above, then check to see if your oxygen sensor is functioning properly. They should be replaced every 60k miles.

Posted on Oct 03, 2010

  • Robin and The Critters
    Robin and The Critters Feb 28, 2011

    Thanks! This is EXACTLY the info I needed. Ive been dealing with shade tree Mechs... and while I have had good luck so far ith them... this one seemd to stump them and was to exp for me to get fixed at a garage. One mech actually changed the injectors... ( that he got used ) and we thought that was it... but within a day it started running like **** all over again. We then changed the plugs and oil.... and when we seen and smelled all the GAS in the oil drain... I freaked! We drained OUT over 6 quarts of.. what should have been oil .... ended up being this watery ( GAS! ) liquid. Ive had it parked and try not to drive it much ... till I knew for sure what it was... I have changed the oil again since then and it was bad, but not as bad as the last time. Seems that when I drive it.... every time i shut it off... and then go to start it again within the hour... it gets tougher and tougher to start.... and you can smell more and more gas each time. Thanks for the great info.



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