ford f150 2006 with a 4.6 ,what will cause it to idle rough and not accelerate

Ford 4.six Engine Problems & Reliability

The Ford 4.6 V8 was the first engine in the Ford Modular engine family. It striking the markets back in 1991 and remained in production through 2014. Ford as well made three primary variants of the 4.6L engine – the 2-valve, 3-valve, and four-valve. Horsepower for the Ford four.6 varies widely from 190hp to 806hp. However, virtually models fall in the 200-300 horsepower ballpark. While those numbers might non sound incredible by modernistic standards the four.6L V8 had plenty to offer for its fourth dimension.

It's also a pretty reliable engine that Ford trusted to power many flagship cars for over twenty years. However, no engine is perfect and in that location aren't whatsoever exceptions here. In this commodity, nosotros discuss a few of the near common iv.6 Ford engine problems and reliability.

What Cars Utilise the 4.6L V8?

Non all Ford iv.6L engines are the same. It was produced for over twenty years and a few different variants exist – notably the 2, three, and 4-valve 4.6 V8. Each valve engine also went through a few updates during their lives. There are also some significant design changes for specific models. The iv-valve 4.6L 2003-2004 SVT Cobra "Terminator" receives a strong atomic number 26 cake and supercharger.

Point is – this is a long running engine with many different variants. As such, not all common problems are equal across these engines. Nosotros'll do our best to discuss which common bug affect which variants of the Ford 4.vi liter V8. Below is a list of the vehicles that utilize the iv.6L engine:

2-Valve 4.6

• 1991-2011 Lincoln Town Car
• 1992-2012 Ford Crown Victoria
• 1994-1997 Ford Thunderbird
• 1997-2010 Ford F-150
• 1997-2014 Ford E-Series
• 1996-2004 Ford Mustang GT
• 1997-2004 Ford Expedition
• 2002-2005 Ford Explorer

three-Valve 4.half-dozen Ford

• 2005-2010 Ford Mustang GT
• 2008-2009 Ford Mustang Bullitt
• 2006-2010 Ford Explorer
• 2008-2010 Ford F-150

4-Valve 4.6L V8

• 1993-1998 Lincoln Mark 8
• 1995-2002 Lincoln Continental
• 2003-2005 Lincoln Aviator
• 1996-2004 Ford Mustang SVT Cobra
• 2003-2004 Ford Mustang Mach 1
• 2003 Koenigsegg CC8S
• 2004-2006 Koenigsegg CCR

*Some versions of the four-valve engine are highly modified. The 2003 and 2004 "Terminator" uses an atomic number 26 block and supercharger. Koenigsegg too used these engines in highly modified class to produce 646-806 horsepower.

4 Common Ford 4.6 Engine Bug

A few of the well-nigh common issues on the 4.six liter V8 include:

• Timing chain
• Intake manifold
• Oil pressure sending unit of measurement
• Misfires

We'll discuss each of these problems in-depth throughout the rest of the article. Withal, it'due south a good time for some quick notes. Nosotros're classifying these as some of the MOST common four.six Ford engine issues. That doesn't necessarily hateful they're truly mutual and bear on a large percentage of engines. Rather, when an consequence does pop upward these are a few of the common areas.

Additionally, the iv.6L engine was in production for 24 years with many different variants and updates. Certain engines and models may exist more or less prone to the failures nosotros talk over. Nosotros'll practice our best to clarify where applicable. Finally, some of these Ford 4.6 engines are twenty-30 years one-time. Chances are they won't offering the aforementioned long-term reliability as some of the newer engines. Anyways, permit'south dive in and discuss the in a higher place 4.6L V8 issues.

ane) Ford 4.6L Timing Chain Problems

There are a few various pieces to 4.6 V8 timing chain bug. It'southward rarely to deal with the timing chain itself, but there are some known issues with the timing chain guides and tensioner. Withal, with these engines aging many may be in need of timing chain repairs likewise. Nosotros'll circumvolve back to that indicate, but our primary focus here is on the guides and tensioner.

Ford 4.6 timing chain tensioner gaskets use a sealing bead that molds directly to the tensioner housing. They recommend replacing the tensioner if this bead goes bad, which is a mutual failure. Fortunately, some aftermarket options exist to replace the gaskets rather than the whole tensioner.

On the other paw, timing chain guides are bailiwick to lots of abuse over the years. Many of the 4.half-dozen liter Ford engines use plastic guides, which isn't the all-time for reliability. Over time those guides can fail and cause a plethora of symptoms and issues as the 4.6L timing might be thrown off.

*Timely oil changes with high-quality oils tin assist reduce the chances of timing chain issues on the Ford 4.6 engine.

four.6 V8 Timing Concatenation Symptoms

Symptoms of timing chain related bug on the 4.6 Ford V8 engine include:

• Cold beginning rattle
• Rough idle
• P0300 lawmaking

The first symptom of 4.6 timing chain problems is chain rattle on cold starts. This is because equally the guides habiliment downward they allow likewise much slack in the timing chain. In turn, the chain will making rattling sounds that are ordinarily about noticeable on a cold engine. If non fixed in time the Ford 4.half-dozen timing concatenation guides may completely fail. This may cause timing to jump which comes with a ton of potential symptoms. You'll likely find a rough idle, poor operation, ability loss, misfire codes, etc.

Ford 4.6L Timing Concatenation Replacement

Verbal replacement obviously depends on exactly what goes wrong. If you're noticing tensioner issues it may be every bit simple as replacing the gaskets. Fifty-fifty then, on older high mileage 4.6L engines you may consider replacing the concatenation, guides, and tensioner. The same can be said if you lot're actually having timing chain guide bug. Again, the timing chain itself is pretty durable but if y'all're at 150,000+ miles information technology might be a good idea to replace.

Part costs aren't as well bad for any of these repairs, only they tin be a footling labor intensive. Expect to spend about $100-400 on parts and labor can add up to some other $200-500+. Ford four.half-dozen timing chain replacement isn't too complicated for the DIY crowd, just it does take some time and patience.

2) 4.half-dozen Ford Intake Manifold Issues

Intake manifold issues primarily touch on four.6L engines upwardly to model year 2001. These manifolds are made from plastic, which isn't a serious problem in itself. Plenty of engines use plastic intake manifolds. The flaw with the Ford 4.6 intake manifold is the alternator bracket mounts into the plastic. That flaw puts actress stress on the intake manifold, and causes cracks to develop effectually the mounting. In plow, a coolant leak develops.

However, that'due south not the only pattern flaw with the 2001 and older intake manifold. Information technology's also common for the temperature sensor and rear heater hose to loosen. Again, this can cause the Ford 4.half-dozen V8 engine to develop coolant leaks. None of these problems cause any serious reliability concerns apart from replacing the 4.6L manifold. Just keep an eye on coolant levels and engine temperature every bit over-heating is something yous'll want to avoid.

In 2002, Ford re-designed the intake manifold to include an aluminum crossover piece. They also used a stronger alternator mountain. These changes profoundly reduce the chance of the iv.half dozen intake manifold running into problems. That said, the newer engines can withal experience intake manifold failure but it'south much less common.

Ford 4.6L Intake Manifold Symptoms

A few symptoms that betoken a possible issue with the 4.6 intake manifold are:

• Coolant leaks
• Misfires
• Poor performance
• Overheating

Cracks in the manifold or loose fittings tin can cause a coolant leak. It volition ordinarily start small and continually go worse as the cracks and/or plumbing fixtures continue to go worse. Outside of that, you might notice misfires and poor performance from the 4.six V8. Finally, if the coolant leak is astringent enough or you fail to top off the coolant the engine may over-heat. In this case, pull over to a rubber location to avert farther damage running an engine that'due south too hot.

iv.6 V8 Intake Manifold Replacement

First off, verify fitment just you'll desire to opt for 1 of the re-designed intake manifolds if yours fails. OE intake manifolds tin run $500+ if buying new. There are a few quality aftermarket options that will run nigh $200-300. Fortunately, the DIY for intake manifold replacement on the Ford 4.6L engine is pretty elementary. Information technology might take iv-6+ hours for those less experienced, then a little patience is needed. Otherwise, a shop will probably accuse a few hours of labor which can add upwards to $200-400+.

three) iv.6L V8 Poor Engine Oil Pressure

Issues with engine oil force per unit area on the four.6 Ford is another common topic. As with the previous problems discussed there are a few potential things at play here. When poor oil pressure occurs it'south usually the oil pump or oil pressure sending unit of measurement at error. The oil pressure sending unit seems to be more common on earlier model four.half dozen V8 engines. Fortunately, information technology'southward a very cheap office and install is easy too. More on that in a moment.

On the other mitt, oil pump problems affect a wider range of 4.6L engines. It's non an extremely common failure, but information technology tin and does happen to some Ford 4.half dozen engines. The gears within the oil pump aren't the stronger design and usually the failure begins with those gears. It'south an important event to lookout for since sudden loss of oil pressure tin event in catastrophic engine impairment.

Ford four.6L Low Oil Pressure Symptoms

Some symptoms that may signal oil pressure problems on the 4.6L V8 include:

• Depression oil pressure light
• Overheating
• Knocking

Often the depression oil pressure lite is the just giveaway to the trouble at paw. Whatever other symptoms might mean it'due south likewise tardily to forbid farther damage. If too much oil pressure is lost the engine can quickly begin overheating. The friction without proper lubrication will then cause serious internal engine damage. Rod bearings are i of the showtime parts to requite out, which can and then lead to rod knock.

4) Ford 4.6 Engine Misfires

Engine misfires aren't actually a problem. Rather, it'south usually a symptom of another underlying problem with the four.6 Ford engine. One of the principal causes of misfires is the ignition system – spark plugs and ignition coils. It'south standard maintenance stuff, so it'due south probably not fair to call it a true issue. Notwithstanding, Ford four.6L V8 engines exercise have a few known spark plug issues.

The 3-valve 4.vi engine in some Mustang GT and F-150 models runs into issues with spark plugs breaking in 2. This makes removing the spark plug(s) very challenging when they break. Sometimes professional person mechanics even have a tough time removing broken spark plugs, and so repair bills can add up for this trouble.

Part of the trouble is some people don't replace the spark plugs soon enough. Ford states the maintenance interval at 100,000 miles which might allow the spark plugs to get "stuck". Yous then put extra pressure trying to remove the spark plug and suddenly it snaps in half. As such, information technology's probably a good idea to replace the spark plugs a bit sooner than recommended.

4.6L V8 Spark Plug Symptoms

When it'southward time to change the spark plugs on the 4.six V8 y'all'll likely detect the following symptoms:

• Rough idle
• Poor functioning
• Misfires

Misfires are a full general symptom that can take many causes including spark plugs and ignition coils. They're among the most common causes of misfires. Y'all might also observe poor performance and crude idling. If this is the case, changing the Ford 4.6 spark plugs is a good starting point. However, you should consider replacing the spark plugs earlier it's needed to avert them breaking.

Ford 4.6L Spark Plug Replacement

In one case a spark plug goes bad information technology's normally a practiced idea to replace all eight of them. It's a very inexpensive repair as parts come in around $50-100, and even novice DIY'ers can knock the task out in the driveway. Just be cautious about the effect with 4.half-dozen V8 spark plugs breaking.

If the spark plug does suspension it can be a very challenging process to remove. You lot'll probable want to go for a repair shop for that problem, but even they may accept a difficult time getting the plug(s) out. In severe cases you may need a new cylinder caput.

Ford iv.half-dozen V8 Reliability

Is the Ford 4.6L V8 engine reliable? Yes, we believe this engine earns above average remarks for reliability. There is a reason Ford stuck with the four.6 V8 in so many flagship cars similar the Mustang GT, F-150, Police Interceptor, etc. The Ford 4.6 engine offers a great residual of performance and reliability. Ford besides improved the engine over the years and addressed some of the early design flaws.

One of our good friends endemic 4 dissimilar Mustangs with the 4.6L V8 – ii Mustang GT's, a 2003 Teminator Cobra, and a Mach1. It's a small sample size, merely they've all lived a long, reliable life. Of course, they were all maintained in an immaculate way. That'south i of the keys to getting a reliable life out of not only the Ford four.6 V8, but whatever engine in full general.

Stay on top of maintenance, utilise loftier quality oils, and fix problems in a timely manner when they occur. Do all of this and chances are yous'll accept a great experience with the four.6L engine. Even so, they are crumbling quickly and older engines might need a little more TLC to keep them running well. Nonetheless, the Ford four.6 V8 is well-known to brand it beyond 200,000 miles without many major issues.

What's your experience with the iv.6L V8? Driblet a comment and let us know!

Or bank check out our 5.0 Coyote mutual problems guide

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Source: https://tuningpro.co/the-4-most-common-ford-4-6-v8-engine-problems/