I bought a used 2007 F150 Triton. I purchased it around 2011 with 50000 miles. It now has 80000 miles. I drove it for about a year when i experienced a bump or jolt in the vehicle around the 40mph mark. It is not noticeable when you are accelerating aggressively. i first thought it was coming from the transmission. it always happened at the 40mph mark. As time passed it quit doing it at 40mph and started doing it more around 50mph. My first thought was the transmission and my second thought was the injectors. Anyone care to speculate or need more info?

 

Change the plugs. Happened to me and a lot of other people on here. Do you know if the plugs have ever been changed?

 

I'd do this first as well, after I checked for codes. If you run codes and you get cylinder misfire codes, then yeah, change your plugs.

MAKE SURE YOU'RE WELL VERSED ON THEM! Changing plugs on the 5.4L 3V engines is a notorious process for many good reasons. Make sure you educate yourself, even if you're taking it to a shop. Make sure you know why they're going to charge you 200+ for each broken plug.

 

I appreciate the replies. Thank you. I have been using the same mechanic for 15yrs now. He has been in business for 40yrs. I will take it to him for a diagnosis.


I was purchasing some Firestone tires the other day and asked if they do tune ups. He said yes but added that if they break a plug it is an additional $100. He then added that on one vehicle they broke 7 plugs.


As a matter of curiosity I was wondering if anyone knows if the plugs come out easier when the engine is hot?


ps: I don't know if the plugs have ever been changed

 

Honestly, I don't think the engine being hot will make a big difference. Ford has issued a TSB on making this process as easy as possible. The most significant step in making the process easier is letting the spark plugs soak overnight in Carb Cleaner before you actually try to take them out. This will help break up the carbon build-up that effectively 'welds' the spark plug head to the housing wall.

 

Warming the engine prior to removal does help. I am also told that using an impact wrench will help as well but I have not tried that method. Make sure that you get the lysle tool before you even start the job just incase any do break. Also, make sure that you put the Motorcraft plugs SP515 back in as a lot of people have had issues with other non-oem plugs. Take your time and it will work out fine, also, while you are changing the plugs, change the boot and spring on the COP (these go out long before the COPs) and use a emory board nail file cut long way down the center so that it narrower on the electrodes on the COP before you put the spring on. Use the proper anti-seize on the plugs and the dielectric grease on the boots and the truck should run like new. Good luck.
Tom

 

Fuel filter, clean MAF and throttle body.

 

What engine do you have, the 4.6 or 5.4? Either way, I doubt you'll have troble replacing the plugs, as in 2007, the two piece plugs (the ones that were prone to break) were replaced with the one piece, and the 4.6 used in 2007 os the 2 valve, and this setup did not have the issue.

 

Bucko, I have a 2007 with 2 piece plugs. It depends on manufacture date, something like 9/2007 is when they switched. Mine is 1/07