My Ranger starts and runs great for a few minutes, then it starts to miss and if I push the accelerator to the floor it runs fine. After about 2 miles of running horrible it clears up all by itself and will run great. Any ideas?
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Check for overheating. I am not sure if the '88 model was fitted with a ECM, but if so, it is possible that it senses an overheating situation and switches to Limp Mode, which is a half- power mode, enabling the vehicle to be driven slowly to a repair shop. The symptoms are the same as the accelerator being pressed only partly down, it will run, but will have no power.
Try replacing coil. Ford coils are notorious for issues. Common issue when coil gets warm, oil in coil expands and leaks upward into coil wire shorting out. When it cools down, starts right up again until warm. Note: This MIGHT be your problem - it does happen.
1988 ranger 2.9 runs great cold then after a few minutes when warmed up hesitates with intermittent black smoke from the tail pipe until i hit the the throttle then clears and will repeat this behavior...
reach to the underside of your egr valve and feel to see if the diaphragm moves as it warms up. if not you may need to replace it. be careful not to bur yourself though, the engine and egr can get very hot very quickly
got me thinking this one??done a compression test ???valve seats i think as cars before 92 didnt require a cat,if engine was designed without stelite coatings on the seats as it ran on leaded fuel.but with the introduction of unleaded fuels some cars sort of got missed in the changeover.but this is a ford and i know that when i worked in the factory in 1972 evan then all engines produced had stelite coatings but that was europeon built engines.Well enough history do a compression test,and if need be grind the valves in and fit new springs and seals it cant hurt
The camshaft may be worn or the lifters .that explains the missing when you run it at operating temp.By the description of the oil. the reasomn the canmshaft wore out and the valve lifters is because the oil was not changed on a regular basis.