Q: Bad engine knock, what can I do?

asked by on November 06, 2015

The engine in my 2007 Ford Fusion starting knocking violently driving the other day. I was pretty surprised, given that the car has just under 80,000 on it and it is never driven hard. I pulled over and killed the engine. When I tried to start it back up, nothing happened. What would make an engine so low in mileage fail completely?

The 2007 Ford Fusion 2.3l Duratec is usually a very dependable engine with few problems. However, there are several issues that could cause knocking and engine seizure. The engine oil filter in this engine is a cartridge type that has a cover that can get warped if over tightened during an oil change. This may potentially cause a sudden oil leak in which an engine could lose most of its oil in a short period and could starve the engine of oil pressure. The loss of oil pressure could cause the engine to knock loudly and seize up. Another possible problem is that the engine front crankshaft damper pulley is not keyed to the crankshaft assembly on this engine. If the damper pulley bolt comes loose without the camshaft timing gears held in place, the timing between the camshaft and crankshaft will not be in sync with each other. If this happens, the cylinder head valves would hit the tops of the pistons, potentially causing the engine to seize and a loud engine knocking noise. YourMechanic will need to determine if your engine was starved of oil or the timing is out of sync. Either way your engine would need to be replaced.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

What others are asking

Timing chain replacement cost?

To obtain an exact quote for replacement of the timing chain, please use the "Get a Quote" link at YourMechanic's timing chain replacement service page. Once you accept the quote, a certified Mechanic, dispatched by YourMechanic, will come right to...

Getting codes P0171 and P0174 with Service Engine Light on.

P0171 and P0174 say the system is too lean on both banks. That means that whatever is causing the problem is common to both sides. The first thing to check for is air leaks, but it sounds like you have...

My car light keeps coming on I think it's a electrical problem a bolt with two lines is showing up

This symbol on Chrysler vehicles and potentially other vehicles is typically related to the electronic throttle body. The throttle body is not controlled with a cable like vehicles of older days. The electronic throttle bodies are controlled with a motor...

No sound when I turn the on the ignition

In my opinion, it sounds like the charging system is not recharging the battery. It is most likely the alternator, but only a test can tell. These vehicles have had many electrical issues with instrument clusters and wiring harness problems...

My car seems to be having one huge glitch after the door was slammed extremely hard

Hi there. You should look at the door latch and the latch striker to see if there is anything visually wrong with the latch contacts with the plastic covers. Then inspect the striker to see if it is damaged or...

leaking oil after fixed

Hello. The first step would be taking it back to the dealer where your car was fixed once more and have them inspect it to see if there is a new leak somewhere. There are several components that could be...

How do I set the clock?

Your truck has a clock built into it so you never have to go searching for the current time. If the clock ever gets off by a few minutes or when Daylight Savings Time occurs, you can adjust the time...

How much does it cost to replace spark plugs on a V6 engine?

Billing question sent to CS for the cost to replace spark plugs on a V6 engine.

Where are the 02 sensors located on my 2010 Ford F-150 5.4L

This vehicle engine has 4 O2 sensors. They are all located in the exhaust system. There is one near each exhaust manifold and they are labeled HO2S1-1 and HO2S 2-1. Then there are two after the catalysts down further in...

Related articles

2012 Ford Fusion vs. 2012 Toyota Camry: Which Should I Buy?
While most people believe that domestic sedans just cannot compete with the Honda Accord and the Toyota Camry, the industry leaders, that is not necessarily true. Yes, there are some metrics where the Camry just excels, however the Ford Fusion...
A Buyer’s Guide to the 2011 Ford Ranger
The The 2011 Ford Ranger offers affordable pricing with excellent styling. It is a compact pickup that is both inexpensive to operate and own. The vehicle is capable of going off-road while still being able to tow 1,600 to 3,100...
What Does an Engine Inspection Entail?
An engine inspection is the first step in diagnosing engine problems. A pre-purchase engine inspection helps you know if a used car is a good deal.