Question about 1993 Ford Explorer Limited

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Engine has a miss and runs rough just purchased prior owner rebuilt top half of the engine-valves lifter-push rods rtc 500 in parts-got to be a sensor let me know what u think

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Hello, You should be able to run a scan and find the problem. A sensor would trigger a "check light" and give a number Code. Autozone, Oreillys, and Advance will scan your vehicle for free.

If you have no check light, then you need to do some old fashion testing without a computer. Use a Vacuum gauge on the running engine and see whether the vacuum levels are steady and if they are at a normal level. Bad valve springs and bad compression will make the needle bounce.

You can do a compression test either by using handgauge or with a computer using a cylinder balance test. The balance test can be performed by a shop having better testing equipment. It will show you how much work each cylinder is doing and will identify each cylinders' characteristics without opening the engine.

You can also check the seams of the Intake manifold with a mist of water from a spray bottle while the engine is running. Any change in RPM will indicate a manifold leak. Once you find the leak, fix it and then try looking for an additional problem if it is still running rough.

The last item I can think of is the timing. Some of the sensors are adjustable and may not be in time.

Posted on May 25, 2011


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