While driving my 1999 Ford Triton V-10 powered C-class motorhome in heavy traffic the engine made a loud bang. After the bang it continued to rattle badly and mis-fire. Worked my way across traffic and stopped in a no parking zone for 2 hrs awaiting a tow truck. We were in a fairly un-safe position, as the shoulder was limited and it was on the exit route for the California speedway just after a nascar race. The repair shop has told me that a spark plug blew out of the cylinder head. I'm learning that this is a common occurrence on this model engine.

- Simi Valley , CA, USA

1999 Ford F-150 with a 5.4L Triton V8 engine... problem: Blown spark plug after work, while accelerating onto the freeway, the engine made a "pop" noise, and then began to sound like a steam engine. The engine was running rough and loud, thus I pulled over on the side of the road. I was concerned that I may have blown a spark plug (or possibly a valve) and didn't want to set the engine on fire. I was stranded until I could get roadside assistance. Dealer claims that the entire head needs to be replaced for the blown spark plug with a newly designed head. Other options include to retread the blown spark plug. Seems like a design flaw based on the large number of other users w/ the same problem.

- Ypsilanti, MI, USA

Was driving the truck home, about a mile out after being on the highway, there was a loud bang. The spark plug had been shot out of it's place, per a shop owner. Not sure why it happened yet. It was stated to us that Ford has many complaints of this happening to their trucks. We have a 99 F150 and wondering if there are more such complaints and if so what can we do to push the issue. It could get someone hurt at some point!

- Olathe, KS, USA

Spark plug blew off when I turned my truck on. Ford recommends new engine because apparently it happens often. There is currently no recall for this problem. Truck needs repair.

- Riverside, CA, USA

I have had different two spark plugs blow out of the head at different times. A heli coil was used to fix the problem.

- Camdenton, MO, USA

I was driving to work and heard loud bang in engine. Found out spark plug had blown. No accident caused. I have two Ford vehicles and the both had spark plugs blow within the last month. Both enignes are 5.4 L.

- Dunkerton, IA, USA

My family and I were 25 miles from home in our 1999 Ford F-250 when a spark plug blew out of the head. I had the truck towed to the Ford dealership and was told that even though the truck had less than 75,000 miles. I had to pay for the repair. This repair cost us over $3,000.

- Mcneal, AZ, USA

I have a 1999 Ford F150 with just over 60,000 miles on it. It has been maintained very well and has had no problems until now. While driving to work on 9/20/05, my engine sounded like it blew up. What actually happened was my #3 cylinder spark plug blew out. Thankfully it did not cause an accident. After investigating how to fix the problem I learned this was becoming very common with Ford Triton motors and would cost appx $3000 to repair. Ford offered no help other then for me to bring it in for the expensive repair, with no guarantee it would not happen again. I thought the truck would last much longer then 60K miles and feel like I bought a lemon.

- San Jose, CA, USA

While driving on the highway a spark plug ejected from the right side cylinder head of my 1999 Ford F150 Triton V8 truck at 56,978 miles. Cylinder head was replaced at Ford dealership at a total cost of $2,418.93. I was notified this was not covered by the manufacturer.

- Saline, MI, USA

On September 23, 2005 had a spark plug blow out of the cylinder head of the vehicle. This was the spark plug on passenger's side, nearest to firewall. This was the third coil that the consumer had, but this it was the first time the spark plug came out. Contacted the dealer, they towed it. There was no forewarning. At 65 mph, the consumer heard a pop and thought it was the tire, but it kept popping until vehicle stopped. The consumer exited the vehicle and discovered it was not the tire. Raised the hood and could see it flapping. No lights in dashboard came on and gauges did not move.

- Corpis Christi, TX, USA

1. no events led to failure. 2. a spark plug blew out of the engine. The consequence is that the engine runs poorly, is loud and has little power. 3. no repair has been made yet.

- Vancouver, WA, USA

I was towing my trailer and had just left my house and got a mile down the road when I heard a loud pop like a tire blowing and I quickly tried to find a place to pull over. I later found out I had a blown plug and of course it wiped the threads and shot up and destroyed my coil on top so I had a helixcoil put in and a new coil. My truck is a 99 5.4 with 67,305 miles on it with the original factory plugs.

- Marshall, MI, USA

Spark plug blow out on 2nd to last cylinder on passenger side of 1999 F150 w\ 5.4 liter Triton engine.

- Victor, MT, USA

I am shocked to discover the thousands of postings on the internet concerning the '99 Ford F-150 that blows a spark plug because of too few threads on the engine in the original design. As a victim of this failure, the dealership acknowledges that this happens all the time and that there is no remedy for it. The cost for repair is almost $3000 and there is no guarantee that it will not recur. Seems that Ford should be forced to recall these engines as it can lead to fire (as straight gas goes into the engine compartment) and the spark plug could spark as it blows igniting fumes or fuel. I will never feel fully safe in this vehicle again and am quite disappointed that Ford is getting away with such a faulty design! please help all Ford F-150 owners that will fall victim to this costly repair and dangerous situation.

- Bloomington, IN, USA

I have a 1999 F-150 Ford pick-up truck 4-2L V-6, I was having a low cooleant problem. Took it to mcdonough radiator shop, they replaced water pump and gasket. It was still loosing cooleant. I called the dealership and ask if there was a recall for this vehicle and was told no there was not. I took it back to the same radiator shop after a closer inspection they removed the intake manifold and found water in the back two cylinders.they replaced the intake manifold gaskets, I picked the vehicle up I had not drove more than 3 miles before it started to make a knocking noise. I called the repair shop and took it back immeadiately, now they tell me that I have 2 bent push rods. They are suppose to replace them today. I found out later that I was not the only one having this problem, after some research on the internet I found a web site that has an long list of people with the same complaint. When I called Ford Motor Company customer "no service" I was told that there had been no recalls on this vehicle for that problem and that they could not help me in any way because of the warrenty had expired. According to jasper engine rebuilders the problem stems from a poorly designed gasket for the intake manifold and that is what caused this problem, got this information from one of their tech bullitens.

- Mcdonough, GA, USA

I blew a plug on my Ford F150. Engine has had proper maintenance. It has about 80,000 miles on it. 5.4 V8 year is 1999. Called Ford and they will no acknowledge a problem and will do nothing to reimburse any of the repair costs. I think it is a faulty head on the Triton engines.

- Sauk Rapids, MN, USA

Sitting at stop light in 1999 F-150 w/5.4 litre engine, slowly proceeded through light and heard a loud bang followed by very loud and rough running engine. This left me stranded at side of road at 3:00am. Turns out that spark plug ripped away from cylinder head causing expensive repairs. This not only is an obvious mfgr. Defect, but a safety concern as well. The manufacturer knows this is a problem and should step up and do the right thing. Thank you. Doug beeman.

- Irvine, CA, USA

While driving approximately 5 mph, the spark plug blew out of engine.

- West Jordan, UT, USA

Transmission gears breaking, timing chain loosening.

- Miami, FL, USA

Consumer was traveling at 35 mph and heard noise from the engine. Vehicle stopped, and had to be towed. After the dealer inspected the vehicle engine was found to be defective.

- Cleveland, OH, USA