Engine Ping, rattle, engine noise, etc... 2007 F150 FX2 5.4L
I have been searching and reading these forums for hours now and I still have some questions about this that I hope someone can help me with. I am new to here, and I am no gear-head, so bare with me if I say something incorrectly.
I have a 2007 Ford F150 FX2 5.4L that has an engine ping (dealer's exact words) when accelerating. Anytime you gas it from a start, or let off the throttle and cost a bit then give it gas again, you hear a noise that I originally described as valve rattle. When I first purchased the truck I heard it only once on the test drive, but now it seems to be getting worse, or more noticeable and happens more often.
I took it into the Ford stealership here in Austin which did basically nothing for me but still charged me $125 and gave me back my truck with it doing just about the same thing. He said they cleaned off the heads which he said had carbon buildup on them (what would cause this?). They found nothing else wrong with the truck.
I've heard this engine ping can be caused from:
1. excess carbon buildup
2. bad EGR valve
3. bad MAF sensor
4. leaky hoses
5. you name it...
If it was ANY of these things, the tech should have found it...
Is there anyone who HAD this same issue and has fixed it?
I will almost PAY for information on how to fix this issue, if it does actually work!!
The owner before me put duel exhaust on it. Looks like Flow's but I haven't gone under to take a closer look yet. No other mods have been made to my knowledge.
Would dueling it out with Flow's cause this noise or carbon buildup that the dealer noticed? Not enough back pressure? Maybe I'm running too lean, too rich? Would a programmer help with the engine ping?
Thank you in advance to anyone, and everyone who might help me with this issue. I love my tuck, and I want it to last, but I feel that if I do not fix this issue soon, the engine life will shorten the more I drive it like this and really cost me later...