Question about 1999 Ford Expedition

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Motor lock up - 1999 Ford Expedition

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I'll try to help you. There are 4 or more failures which need to be checked. You can have a stuck Starter, broken Timing chain and Gears, or the (Crankshaft and Camshaft )sensors can be bad as well as a leaking Head gasket.

If you have a "Check Engine" light on the dash, it would be worth using a Scanner to read the onboard computer. If you don't have a Scanner you may have to tow it to a Repair shop or borrow or buy a Scanner.

Then, check your Oil. It is the engines' lifeblood. If you can't tell any contamination from the dipstick, go under the truck and drain the oil. The drainplugs usually are magnetic, and small pieces of broken engine will drain out with the oil through the drainplug hole.
If the oil comes out without any shavings or pieces or Antifreeze, then you may have less damage.

If you have Antifreeze in the oil, you probably have a bad head gasket. You would have to pull the Intake, and pull the Sparkplugs to find out which Headgasket is bad. If no Antifreeze continue reading.

If you have a big set of sockets and a breaker bar, you can grab a bolt on the crankshaft and try to physically turn the engine with the Ignition off. You may be able to rock the Starter back into a neutral position and free the engine.

If you are able to free the engine your problem may just be a simple frozen Starter. You may want to pull the Starter if you can't rock the engine. It would be the only bolted -on thing that can jam the engine and the only thing you can pull without disassembling the motor.

This Starter is not an easy one to pull if you have the 4x4 option.

The most simple defects to hope for are the sensors and Starter. The sensors affect the valve position and can cause the compression to build when it should not. The Starter is a pain to remove, but would mean your engine is not bad, just the Starter.

Posted on Oct 15, 2010

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