1986 fanger 2.3 before and after rebuilt gets gas in oil get 5 mpg why?


Asked by Jun 20, 2013 at 01:30 PM about the 1986 Ford Ranger STD Standard Cab 4WD SB

Question type: Maintenance & Repair

3 Answers

Tracy Hooks

A few things to check: with the engine off, remove the vacuum line on the fuel pressure regulator and see if there's raw fuel in the vacuum line. You can cycle the key on for a couple of seconds but don't try to start it. Raw fuel = blown fuel pressure regulator. Change the regulator and the oil. Check for a blocked or pinched fuel return hose. Do a compression check. Rings can cause a concern like this too - excessive blow-by. Are there any codes in the computer? A MAP sensor failure can cause the system to go full rich and dump a lot of fuel too. AIT and ECT sensors will also force a system rich.


we rebuilt engine it still has gas in oil get 5 mpg haven't checked fuel return thanks

Tracy Hooks

I covered all the issues I can think of that could cause bad mileage and cylinder wash-down providing that the engine was assembled correctly and the valve timing is right. 5 mpg is incredibly low. Unheard of for a 4 cylinder. Driving a vehicle in this condition will burn out a Catalytic Converter, cause the exhaust manifold to glow red and overheat the engine. Of course, when you change the oil after 500 to 7500 miles is will smell a little like gasoline - that's normal because there is no such thing as a perfect seal from the rings.

Your Answer

Add photo

Related Questions

  • Can the EGR system be eliminated on my 1992 Ranger? 1 answer

    I have a 1992 Ford Ranger 2WD 2.3 4 cylinder 5 speed that is throwing codes for the EGR valve and the EGR valve sensor (it is the old style sensor, not the DPFE style). My question is this, can the E...

    1992 Ford Ranger XLT Standard Cab LB


    Maintenance & Repair

  • ranger want crank 4 answers

    i have a 1994 ranger with a 2.3 inline 4 with a 5 speed standrad trans my truck is weird i put a new starter and battery but i can crank the truck and go somewhere and it wont crank on less i hold th...

    1994 Ford Ranger


    Maintenance & Repair

  • 86 ford ranger 4x4 overheating problem 2 answers

    I have a 1986 ford ranger 4x4..automatic...2.9 motor....v6. Ive had this truck for a couple months now and I haven't had any problems ...but the other day my boyfriend fixed the a/c and then I not...

    1986 Ford Ranger


    Maintenance & Repair

  • Why wont my truck start and run? 5 answers

    Ok,so I have this 1986 2.9L Ford Ranger,Fuel injected not Carbureted. I replaced the Fuel Pump,Fuel Filter,Fuel Pressure Regulator,Spark Plugs&A tttnd Wires,and got a new battery. The timing slippe...

    1986 Ford Ranger STX Standard Cab SB


    Maintenance & Repair

  • Duratec swap 14 answers

    I have been thinking about doing an engine swap in my truck for a long time. I have an 86 ranger with the old 2.3 litter I4. I was woundering how hard would it be to swap in the 3.0 litter duratec v6 ...

    1986 Ford Ranger


    Car Customization


Looking for a Used Ranger in your area?

CarGurus has 7,800 nationwide Ranger listings starting at $988.


Search Ford Ranger Questions

Ford Ranger Experts

#1 FordNut
Reputation 1,330
#2 tennisshoes
Reputation 940
#3 Tracy Hooks
Tracy Hooks
Reputation 670
View All

Related Models For Sale

Used Ford F-150"
3,163 Great Deals out of 216,428 listings starting at $1,000
Used Chevrolet S-10"
12 Great Deals out of 1,813 listings starting at $1,749
Used Dodge Dakota"
157 Great Deals out of 4,803 listings starting at $900
Used Jeep Wrangler"
432 Great Deals out of 16,279 listings starting at $3,600
Used Ford Mustang"
722 Great Deals out of 41,401 listings starting at $900

Used Cars For Sale

2011 Ford Ranger For Sale
73 Great Deals out of 1,440 listings starting at $4,500
2010 Ford Ranger For Sale
26 Great Deals out of 573 listings starting at $4,495
2009 Ford Ranger For Sale
29 Great Deals out of 484 listings starting at $3,495
2008 Ford Ranger For Sale
28 Great Deals out of 598 listings starting at $2,699
2007 Ford Ranger For Sale
19 Great Deals out of 407 listings starting at $3,298