The 5.4 is an excellent TRUCK engine. The early 5.4 had a problem with spark plug blowouts but I think that was due to people not taking the time to change the plugs properly because they are a pain to change.Click to see full answer. Also to know is, how reliable is the Ford 5.4 engine?The 5.4 2Valve engine is one of the most reliable engines ever. The 3 valve has VCT issues sometimes that can kill the engine. But any engine has to be maintained properly. Good maintenance and a light right foot will get maximum service.Secondly, what year did Ford 5.4 have spark plug problems? The original equipment Motorcraft brand spark plugs that were factory installed in many late model (2004 to 2008) Ford trucks with 5.4L V8 and 6.8L V10 engines, 2005 to 2007 Mustang GT 4.6 & 5.4L V8 engines, and 2008 Mustang GT models built prior to 11/30/07) can break when you attempt to remove them! Herein, is the Ford 5.4 Triton a good engine? The Ford 5.4 Triton Engine can be Reliable if Maintained Correctly. The Ford 5.4 Triton engine has been produced in millions of units and has successfully propelled at least a dozen different car, van, and truck models. It was a popular option all the way from its inception in 1996 to 2010, in all of its iterations.What’s wrong with the 5.4 Triton?The most common symptoms, aside from a no start, is lack of power, the code P1233, and hard starting. Lastly, the scariest part for most late model 5.4L Triton owners, is the problems related to the timing chain, tensioners, and the variable valve timing.
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