When the 4.6l powered Crown Vics and Town Cars started showing up en masse as taxis and police cars I remember nearly every one of them eventually having a blue cloud of smoke following it around but that was only the early models and this is in a driving environment where these cars got a lot of abuse.

• Ford 4.6l Engine
• 4.6l Ford Engine

There are many people who are looking at buying a new truck (New to them!) or considering keeping their old truck for a few more years. Everyone sees these late model F150's with the 5.4L Triton engine as a risky investment but I'm here to tell you this engine can be solid. It does have some common reoccurring problems you should be aware of. These problems range from easy to change coils, to the dreaded spark plug, all the way to the scary and expensive timing chain issues.

This article is mainly written with the 5.4L truck engine in mind, but it also applies to the 4.6L used in trucks, vans, and cars. This article is written so that the easiest repairs are first, and the harder repairs are last. So keep reading or skip to the bottom to get to the juicy parts. The most common thing we need to mention, but it is the easiest to fix, is the ignition system. The 5.4L Triton features a coil-on-plug (COP) design; a separate coil for each cylinder that sits atop a specialized spark plug (more on that adventure in a minute!). COP systems are now very commonplace in the automotive industry. The general consensus is that this type of ignition system is the most efficient design offering independent control, but the coils do suffer from failures likely related to heat. Most trucks will need multiple replacements in it's lifetime.

• The engine is gradually replacing the 4.6L and 5.4L Modular V8 units in all Ford vehicles. This is the first time that Ford has used the '5.0' designation since the pushrod 5.0 was discontinued and replaced by the 4.6L Modular unit in the mid-90s. Vehicles equipped with the.
• Nov 18, 2009  The 5.4L V8 was introduced in 1997 with the rest of Ford’s then-new modular motor lineup and like the other modular truck motors, it wears the “Triton” name. Unlike other engines that spent time in other vehicles (before finding their way into the Ford trucks), the 5.4L started its life in.
• 4.6L & 5.4L Ford Rebuild Cheat Sheet: Selecting Parts Parts selection is one of the most important elements of engine building because all parts must operate in concert with one another. Never has this been more crucial than with Ford’s Modular V-8 because of the many variations produced since 1991.
• 4.6L & 5.4L Ford Engines: How to Rebuild is a hands-on, step-by-step, rebuilding manual that expertly explains each rebuilding phase for these engines. This newly revised edition delivers the complete nuts-and-bolts rebuild story so you can rebuild an engine at home with professional results.
• Mar 12, 2014 We explain Ford's 4.6L double overhead cammer screamer! The modular DOHC V-8 is a natural born hot rod and a powerful engine swap for your vintage Ford.
• Buy Ford Racing M9424P46 Intake Manifold: Intake Manifolds - Amazon.com FREE DELIVERY possible on eligible purchases. Mustang GT 4.6L SOHC 2VType - Single.

Ford 4.6l Engine

The most notable tend to be failures of the coil boot, the piece of rubber that covers the spring that goes from the coil output prong to the spark plug. These deteriorate with age and weak spots in the rubber can cause the spark to jump to the plug well instead of the spark plug. These wells can also fill up with oil or coolant and that can also affect the performance of the coil. Sometimes the ignition coil can fail internally as well. The most common symptoms of this issue is cylinder misfires under load accelerating or most notably cruising around 55mph in overdrive. It will cause a light jerk or bucking that some say feels as if you may have transmission issues. They are pretty easy to replace though. Generally at the Ford dealership, we will diagnose the cylinders with the misfire and replace the plug and coil for those cylinders.

4.6l Ford Engine

Spark plugs are a whole different animal on this engine. They decided to place each of these sensitive coils upon a specialized spark plug that tends to break when removed. Due to the design of the combustion cylinder, essentially these engines are semi-hemispherical, the plugs needed to protrude down through the head to the combustion chamber. The situation is slightly ironic since earlier 2 valve 5.4L (97-03) tended to blow spark plugs out of the head but later 3 valve 5.4L (04-07) tended to break off in the head.

These plugs generally last around 100k miles but they are a bear to remove when you do go to replace them. They have extended sleeves that reside down inside the head that tend to break off because of possible carbon/rust build up. This issue was fixed by a redesign of the spark plug in the 2008+ years. More details are available in another article I wrote which include step by step instructions on Replacing the spark plugs on the 5.4L Triton at home.

Be wary of driving with this engine if you are experiencing a misfire of any kind. Some people ignore the felt misfire or think it is a transmission issue. At the dealer, we generally see these trucks go a long time with this misfire condition. Eventually, the truck will start to backfire through the intake and even fail to accelerate to over 30mph in severe cases. If this happens, likely you have a catalytic converter that has been damaged due to misfires. Always be on the lookout if you have a converter failure because engine drivability issues kill catalytic converters.

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