I brought a second hand explorer around 2 months ago.
When test driving it there were no issues. on the drive home it was like it was back firing.
This didnt happen to often but now it is all the time at any speed under pressure and not.
Ww have take it to get looked at, they said O2 sensors so we changed
the one they said was rooted. This did not fix the problem, we have
tried taking the front axel of to see if this helps and no.
We have taken back to get looked at as we thougth it may be the inlet
manifold they saw there is nothing wrong with the inlet manifold.
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Your transmission should be in neutral when shift from 4x4 low to high. Also the brake needs to be depressed. If you have done that I would say it is a solenoid in the transfer case or the relay that drives the transfer case solenoid.
Tranny fluid may have been contaminated with coolant since tranny cooler lines go to radiator or condensor. I would fix your leak on radiator, then completely drain tranny fluid and filter and replace.
If you confirmed spark is there, and you hear fuel pump working, I'd still try spraying WD-40 in throttle body intake for a couple of seconds, when it won't start, just to see if it kicks over, just in case pump is running but not up to pressure. If it fires for a second or 2 with WD-40, then you know lack of fuel is the problem.
it should be the speedometer sensor connected to the tranny. it is easy to get at. and it should cost less then 40.00 dollars.when you drive the explorer. wind wiggles the wires around under the truck making it work sometimes.
HAVE YOU TAKEN YOUR FORD BACK TO THE PEOPLE WHO REBUILD YOUR TRANS. FOR A 300 MILE TEST DRIVE? I HAD THE SAME PROBLEM AND COME TO FINDOUT THE TRANNY WAS LOOSE ON THE END AND THEY WERE ABLE TO FIX IT AGAIN.
It is true that driving with different size tires can damage the transfer case, depending on how long it was driven like that. But--- even if the tires are the same size it can cause this. if the tires are worn and two tires are new the circumference of the tires must not be more than 1/2 inch difference from each other, take a tape measure and put it around the tire in the center and measure the difference of each tire