94 Ranger with 4.0L fuel mileage down to 12.75mpg...

View previous topic View next topic Go down

94 Ranger with 4.0L fuel mileage down to 12.75mpg...

Post by Admin on Sun Mar 13, 2016 8:46 pm

First tank was 16mpg. Second tank 12.75mpg. No I dont drive whole lot. This is mostly my grocery getter for winter thanks to its high ground clearance.

Looking online and they said check the oxygen sensors. A 94 only has two. I did. One was light tan like a spark plug would look in an engine where fuel ratio is correct. Other was black with fluffy carbon on it. Online they said either bad oxygen sensor or a leaky injector on that bank of cylinders. I replaced both oxygen sensors with new Denso sensors. Found new pair on ebay for $25 shipped each. Good price for Denso. Already learned not to bite on generic sensors just to save $5.

I started it afterwards and it took some time for check engine light to come on compared to before, where it came on immediately, but it did come on. Possibly could be me bypassing the IAC. Or something else. I will try to remember to stop at Autozone next time to town and get a readout of codes. I am just not up to counting little flashing lights. Am curious if this will increase gas mileage. 16mpg in a Ranger is bad enough. 12.75mpg really sucks, I get 13mpg on my old '84 F250 4wd with the 300-6 and a non-computer carburetor. It weighs 6000 pound compared to 4000 pound for Ranger. I used to get 16mpg on my old full size 1960 Chevy Apache with 235-6, granny 4spd, and an eight foot bed. And it wasnt geared for economy. So a smaller truck thats geared for economy and is a computerized modern wonder with similar size engine, cant do any better????? Progress??? Seriously a 4.0L Ranger should do at least 20mpg. The LIMA 2.3L engine would do 25. Think the later DOHC 2.3L would top 30mpg.

Admin
Admin

Posts : 76
Join date : 2014-07-09

View user profile http://homesteadtinkerer.betaboard.net

Back to top Go down

Re: 94 Ranger with 4.0L fuel mileage down to 12.75mpg...

Post by Admin on Fri Mar 18, 2016 1:09 am

Ok, refilled tank yesterday and 13mpg. GRRR.... Been reading and reading online. Finally figured its either the temp sensor that tells computer the coolant temp. Or its the fuel pressure regulator. Went out and looked for the fuel pressure regulator. Found it. BINGO! Some previous owner had disconnected the vacuum line going to it and capped off the vacuum ports on both the regulator and the manifold.

These fuel pressure regulators used to be dealer only part and they charged moon for them, well over $100. Ford redesigned things in late 90s and put regulator in the fuel tank along with the pump. So less and less demand, plus third parties started selling them. Anyway after lot searching, found new one on ebay for $30 shipped. Its on its way. I didnt even test current one, figure current one has ruptured diaphram, so was leaking and some previous owner not feeling like buying a new one, just plugged off the vaccum ports so raw gas wasnt sucked into the manifold. However this meant no pressure regulation so pressure can spike and engine runs rich. REad of many Explorers with this engine from that vintage where fuel mileage would suddenly drop from high teens to 12 to 13mpg and corrected by new pressure regulator. Hey makes perfect sense to me.

This engine is no mileage champ, but no reason in world it shouldnt get 16 to 18 mpg on regular basis. Still nothing to brag about, had heavier V8 vehicles with no computer that did that well.

Like said before if this engine got 35mpg, then I would praise the electronics as a miracle. But when it doesnt do any better than an antique carburetor engine without all the complexity, its just another unnecessary expense to keep it in repair.

Admin
Admin

Posts : 76
Join date : 2014-07-09

View user profile http://homesteadtinkerer.betaboard.net

Back to top Go down

Re: 94 Ranger with 4.0L fuel mileage down to 12.75mpg...

Post by Admin on Sat Apr 09, 2016 2:16 am

I replaced FPR with a $30 new one off ebay. Mileage went down to 10mpg. Somebody suggested the air temp sensor. I pulled it and found it was wet with gasoline. Where no gasoline should be. Yep, dud FPR. Ordered a new Motorcraft one for $60. Also new coolant temp sensor and air temp sensor. Took long drive today. 14mpg. Hey better than 10mpg, but we are still talking mileage more like a full size pickup with a V8.

I will putter with it while longer but think its due for an engine transplant. I dont have emissions inspection here so going to get a carburetor straight six. A chevy no less cause I happen to have one in good shape. It also easier to fit than a ford straight six. I know, put a Ford straight six in the old Ranger. I got 16mpg when this old chevy six was in full size pickup. Think had like 3.73 axle. Should get better mpg with the Rangers 3.27 axle. I even found article of some guy that put progressive 2bbl weber carb on his old chevy straight six and got 18.5mpg with that 3.73 axle.... Sounds like a plan.

Though I did get a fuel pressure tester so will fiddle a little more with the 4.0L. But its gotta get at least 16mpg on regular basis to remain in the truck. Sorry but I could put a stock carburetor chevy 350 in there and probably get 14mpg on long drive!!! Lot more fun to drive too....

Admin
Admin

Posts : 76
Join date : 2014-07-09

View user profile http://homesteadtinkerer.betaboard.net

Back to top Go down

Re: 94 Ranger with 4.0L fuel mileage down to 12.75mpg...

Post by Sponsored content Today at 2:11 am


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum