Let's find out more about it in the following sections. The cool thing is that there is a diagnostic strategy that you can use to figure out precisely what's wrong with your particular no-start problem. OK, the list of possible things that can go wrong looks pretty long, but it is rare to see (or have) two different components go bad from two separate systems simultaneously.
A broken timing chain (although this is very rare). Although rare, internal engine mechanical problems can and do cause no-start conditions. The engine pistons and cylinder head valves (and all the other related components like timing chains, etc.) are responsible for the induction of the fresh air the engine needs for the combustion process. You can easily test the fuel pump (along with the other two components) to make sure it has fried. The fuel pump inertia switch (tripped and cutting power to the fuel pump). The fuel system component that causes the majority of no-start no-fuel problems:. The fuel system is the one responsible for supplying the engine with fuel. You can systematically test the ignition system components to precisely determine what has failed (if indeed something has). The ignition coil pack is not receiving power. In my experience, the most common component failures of the ignition system that causes a no-start no-spark condition are:. More specifically, it uses a coil pack type ignition system. The ignition system of the Ford 4.0L equipped vehicles covered by this article use a distributor-less ignition system. Without spark, the engine will crank but not start. The ignition system is the one responsible for creating and delivering spark. This simple but essential information lets you know that the engine no-start problem will lie in the fuel system, ignition, or the engine. So, when your Ford 4.0L Explorer (Aerostar or Mercury Mountaineer) cranks but does not start, it's because one of these components is missing from the mix. 
To successfully troubleshoot the cause of the no-start condition of your Ford 4.0L Explorer (Aerostar, Mercury Mountaineer), you need to know that there are three fundamental components the engine needs to start, and they are:
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How To Test The Starter Motor (4.0L Ford Explorer, Aerostar, And Mercury Mountaineer).The following tutorial will help you test the starter motor: So if you've got a no-crank problem, start with testing the starter motor. This tutorial is geared toward a cranks but does not start condition. No-Crank Condition: The engine does not turn over when you turn the key to start your Ford vehicle. No-Start Condition: The engine cranks (turns over) like it wants to start, but it never does.
Here's a brief description of both conditions: There's a big difference between a no-crank and a no-start condition. Difference Between A No-Crank And A No-Start Condition You can find this tutorial in Spanish here: Cómo Probar Un Arranca Pero No Prende (4.0L Ford) (at: ).
More 4.0L Ford Explorer, Aerostar, And Mercury Mountaineer Tutorials. STEP 4: Checking Engine Mechanical Condition. STEP 3: Checking For A Blown Head Gasket. Difference Between A No-Crank And A No-Start Condition. Every remanufactured long block has been specifically engineered to help improve the inherent flaws and failure points that can be found in many of today's engines. Heads are aligned for proper bore consistency. All valves, valve springs and valve guides must pass our stringent process of meeting and exceeding OEM specifications. Triple angled cutters are used to machine the valve seats ensuring proper pressures and flow. Before each head is mated their block using the correct torque valve we vacuum test all seals for proper seating. These polished Cylinder Heads are pressure tested using magnetic detection to eliminate the chance of cracks or flaws unseen by the human eye. Our Cylinder Heads are assembled using a new valve stem and seals that feature the latest in high temperature technologies increasing heat resistance and longevity. We meticulously mill each Cylinder Head until perfect alignment and sealing of the head gasket is achieved. Crankshaft's are precision cut and micro polished to achieve a 12 RMA reading or better. Computerized micrometers are used to resize rods with strict accordance to factory recommendations. Using a carbon two-stage power hone we can maximize the sealed area and ensure to precisely meet the recommended RMA readings. Once a block is fully cleaned, we begin our precision boring and honing process. Blocks are then thermal cleaned followed by steel micro blasting until they achieve a brilliant appearance. WARRANTY CORE INFO Our precision remanufactured Ford 4.0 blockĮvery Ford 4.0 block must pass our magnaflux inspection designed detect any microscopic flaws or cracking.
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