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.WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market. Power distribution box Ford Explorer – power distribution box -USA version Relays Ford Explorer – relay box – engine bay – USA versionįord Explorer – relay box – passenger bay – USA version Relays locationīody compartment relay module #5 (2 door high series)īody compartment relay module #5 (4 door high series)īody compartment relay module #5 (4 door low series) Under hood lamp, map lights, glove box lamp, dome lamo, visior lamps, accessory delay, dimmer switch illum., 4×4 system Radio, power antenna, GEM system, anti-thef, celluar phoneĤR44E/4R55E overdrive, DRL system, backup lamps, 4 wheel drive, rear defroster PCM system, stoplamps, 4 wheel drive, anti-lock brake, speed control, trailer tow Year of production: 1995, 1996, 1997, 1998, 1999, 2000, 2001 Fuse box (located under the left hand side of the instrument panel) Ford Explorer – fuse box – instrument panel (USA version) Fuse/CB/relayĮATC memory, seat memory, message center, celluar phoneĮATC system, rear blower, speed control, GEM system, brake interlock, overhead console, automatic ride control Ford Explorer (1995 – 2001) – fuse box diagram (USA version)