i need some help on my ford explorer 4.0l

[shortstack]

try your map sensor

 

[extrmndor3]

whats the map sensor?

 

[mawrazen]

Try these things! From a post or 2 on gas mileage and Hwy Stumbling.

Could be a bad tranny modulator or vacuum leak! Check your vacuum lines for ATF and leaks or disconnects.

What codes are you getting?

Original post

I used to get 12 to 14 miles to the gallon. When I got the truck, I got 240 miles to a tank or less on the best of days. I now have gotten over 426 miles on a 19.5 or so gallon tank. This is at 74+ MPH at over 2500 RPMs.

1) Solve all error codes (CEL) Auto Zone will check for free!
2) Seafoam treatment in the intake
3) K&N Air Filter
4) Synthetic oil
5) Good Plugs
6) Tires at 40 PSI (Hot)
7) Fix all that is wrong with the truck! (I needed a new Tranny modulator +)
8) Acetone additive
9) Seafoam or fuel injector cleaner in the gas (Not every tank)
10) Remove bug shield
11) Remove roof rack
12) Drive conservatively (Slower is better, no fast starts or hard braking)
13) TPS mod to .96 v DC
14) ATF conditioner
15) Always check your fluids (Every tankful)
16) Reset the computer (Disconnect Batt. for 10 mins)
17) Avoid gas with ethanol additive if you can help it.
18) Don't always buy the cheapest gas (If Fuel City is $2.89 and BP is $2.93, go to BP) "

Since that post I have since also:

Installed new EGR Valve.
Cleaned the MAF.
Installed new 8mm wires.
Replaced PCV valve.
Checked for vacuum leaks.
Swapped ECU with 1994 Ex from boneyard.
Cleaned IAC.
Installed experimental Cold air intake Version 1.0. LOL!!!!

Its ok to laugh, but it seems to help.



I hope this info helps!

 

[extrmndor3]

OMG dude ur soo cool thankx but still i dont have leaks and now my truck acts like always and i have to put 2 quarts of oil every week and i dont have oil leaks nothing is wrong with the truck it doesnt seem like isburning oil i dont know whats up...


where can i get a tranny modulator?

 

[shortstack]

http://autorepair.about.com/cs/generalinfo/l/bldef_495.htm

 

[ATiredExplorer]

Disconnecting the battery helps a bit in my opinion (restting the computer). You could also try making sure you have the right gap for your spark plugs. And/or change them out completely. This helped me so much when I changed all but 5 and 6 (only 'cause I can't get to them. Some big black thin attatched to the body is in the way.) My miles per tank shot up from about maybe 290 or a little less to about 300 and up per tank. I'm still even getting a little over 300 even when I drive with heavy acceleration and what not. Awesome!

 

[michael thomas]

just completed the project where i took out the 4.0 and replaced it with a 3.5 mazda / perkins diesel engine.
It is working but i am getting a slow take off from a starting position since it does not seem to be changing properly automatically.
remember that i meshed the engine onto the original ford explorer transmission however it develops well on the open road .
you have to relearn how to drive it and then it is ok.
the gas milage is very good compared to the 4.0 i have only put in 30 bucks since i have changed the engine and the odometer is not working so at this time i cant give miles per gallon but i have travelled distances that it would have taken 90$ in gas to cover and so far i have not refueled .
i hope to have the pics soon
i encountered a lot of problems in this mod and at times i wondered if i was crazy to attempt it but i have reached the point where i can now drive .
the problems are weight of the perkins engine which is extremely hevier than the 4.0.
the size of the engine which leaves little space for anything else including the radiator which is now a tight squeeze .
noise of the engine and vibration and dont forget the exhaust which is diesel ,
however it is with a sense of acheivement that makes me happy and the fact that i did it and i am not even a mechanic .
the gas milage has given my explorer a new lease for life since i would not have been able to afford to drive under such bad gas milage as the 4.0 was giving ,so i can bear the vibration on startup, the roar of the diesel engine and the smell of diesel with a smile and money in my pocket from the gas saving .

thanks for following this project
michael thomas