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Hi All, I have a 91 4x4 that I purchased with a rebuilt transmission and rebuilt torque converter. My problem is that I don't believe that the converter is locking up. I can be cruising down the highway at a constant 70 mph and the engine rpms will go from 2300 to 2900 with no apparent...

Hi, I am having trouble getting my 91 Explorer running well and an trying to determine cause of trouble codes 53 and 72. My Haynes Manual decodes these as: 53- Throttle position sensor out of range (high) 72- Insufficient Mass Air Flow change during Dynamic Response Test The engine...

I bought some Bosch Type II 19 lb injectors from www.fiveomotorsport.com for my 1991 4.0 and am wondering, now that my little 4.0 runs very crappy, if these will work right for the 4.0. My engine is running rich (I've replaced the pressure regulator) and has no power. All ignition...

I recently purchased a 91 4x4 with a seized 4.0. I have rebuilt and reinstalled the engine but while it now runs, it has very little power and low, but steady, vacuum (14 in Hg). The cylinders all have good compression (130-150 psi). I have pulled several plugs and they are black so I...