Ford Explorer 97 - cranks but won't start sometimes
Every few weeks, I will try to start my car, you can hear it crank, but just won't start. The mechanics check all the codes and everything looks fine. New spark plugs, new wires, new fuel pump. Could it be the crank sensor or the ignition switch?? It happens when it gets warm outside, over 80 degrees.
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Re: Ford Explorer 97 - cranks but won't start sometimes
I don't see anywhere where you replaced the drive belt or the fuel filter it could be building up pressure in the fuel pump causing the sending unit to stick but before you do all this get a digital volt meter and check out the crank sensor I'm just asking because it has happened to me if you have a lot of keys on one key ring it can damage the ignition switch so check out the crank sensor and the ignition switch first
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Did you check the fuel pump relay ? The relay gets power from a fuse and also from the PCM relay. The computer grounds the relay to turn it on for 3 seconds when you turn the key on, then only after the computer "sees" RPM or oil pressure.
No spark or no gas. Are you sure the gas gauge acurrate? When you turn the ignition key from Off to Run, but not all the way to start, listen carefully for the sound of the fuel pump. If you don't hear anything, check the fuse. If the fuse is good the pump may be bad.
Remove a spark plug wire and hold the metal end close to [but not touching!] a metal ground [use a pair of insulated pliers to keep from possibly getting shocked. Have a helper crank the engine. If you see a spark, the ignition is probably ok, although that's not 100% certain, as the timing or dwell angle could still be off.
Its not the oil, increasing temperature will thin out the oil. If it cranks easily but won't start it could be the spark plugs or the spark plug wires. When they heat up, especially if they are old, they won't perform well. Pull off one of the wires and hold it close to the plug, try to crank the engine and look for a spark. If it sparks them try removing a plug and check to see if it looks wet. If its bone dry it might not be getting fuel.
You mean that the starter is turning (cranks) the engine but the engine won't start? Be sure it is getting fuel. Turn the key to the on position and you should hear the fuel pump in the fuel tank run for a few seconds. If so that is good. If the fuel is being delivered then possibly you have no spark which usually is the electronic ignition module. The only way to test it is to replace it. Your timing chain or belt could be broken or "jumped" as the third possibility. I am leaning toward ignition module being bad as they just die without warning and nothing can revive them.
Remove the battery terminals, clean the posts and terminals and coat them with anti-corrosion grease. Wash your hands after this procedure to prevent mysterious holes in your clothing. With luck, this should fix your intermittent.