Use a code reader and see what codes are stored.
There could be multiple possibilities, you mentioned "changing the plugs". Did you ever change the plugs at the required interval? The reason I mention this is, the gap on plugs grow larger over time, the ignition system will continue to fire the plugs, but will need to draw more and more current. This results in the coils getting hotter until they start to fail. It can also cause the PCU to fail. (Timing changes, overheating, even complete failure to run).
I am no ford expert. However your problem seems to be one of troubleshooting an engine that will not start. What you have told me in your description of the troubles seems to be two problems - one is the lack of spark and two the seizing of the engine. Apparently you have a gauge or over-temperature light that tells you car has a leak or crack in the block. The spark can be tested by plugging in a sparkplug to sparkplug wire and touching metal part of the plug to the engine - if it sparks then the ignition is OK.
SOURCE: 1999 ford Explorer 4.0 v6 4x4 will cranck but not start has spark
Honestly it's probably just dirty spark plugs. Did you pull any of the spark plugs and inspect the tips for build up? A couple things to remember:
1.) If the timing chain broke, the valves wouldn't be opening so you wouldn't have any air coming out of the exhaust during crank. You said it smells like you're getting fuel, so I'm assuming that means you're smelling the exhaust fumes, right?
2.) The crank sensor tells the ignition system when to send a spark to the plugs. If you're getting good spark, it's unlikely that the crank sensor is faulty.
If it's too soon for spark plugs to need replacing, check your sensors. A faulty oxygen sensor for example could cause your engine to run 'rich', resulting in faster crud build up on spark plug tips.
SOURCE: timing chain gear marks up or together and spark plug diagram wir
put the dots together, pull out num 1 plug bring num 1 piston up too top dead center on compression stroke,
SOURCE: 1997 s-10 sames to get vapor lock
Change your fuel filter, it may have gone it's life time and is getting to dirty to let fuel flow properly. Your fuel pump to may be getting weak, if the fuel filter is dirty the pump works harder and heats up and could be over heating the fuel pump relay too. The fuel pump relay i believe is in the glove box behind a panel that say relay, there should be (3) in there and the middle one is the fuel pump's. switch then around after you change the fuel filter and if you get a chance, check your fuel pressure at the shredder valve. Good luck and hope this help's if there is a Auto Zone around you, you can ask to use the fuel pressure gauge to see what fuel pressure you have and they'll have the step by step instructions on how to do it and takes about 5 min to do and will have the fuel filter and step by step to replace that too. Keep me posted, be glad to help.
SOURCE: 1995 Mitsubishi Diamante is overheating. Oil
the symptoms are that you have a burnt head gasket, its consuming the water into the cylinders and at the same time it builds combustion pressure in the cooling system causing it to overheat, and when it overheats it makes the oil loose viscosity so you loose oil pressure, i recommend not driving the car any more and the first solution is to replace the burnt gasket, and change your oil, go to a local shop and only do these they probably tell you the engine is worn but the problem is what i told you above, make them replace the thermostat unit yes to be sure good luck
SOURCE: My 2002 Ford Taurus, just
could be bad water pump,leaking anti freeze,may have blown the head gasket as result overhaeting engine,check oil for milky gray color,or see if coming out exhaust if so blown head gasket,have someone help you check it out
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