Mechanics

FORD EXPEDITION BUZZING PROBLEM

2006 Ford Expedition • 99,000 miles

Hello, I just bought this Expedition and noticed has no power for passing at higher speeds, and also, when it downshifts, there is a rattling sound that seems to be coming from the transmission. Additionally, there is an intermitant buzzing sound, while going down the highway. Not loud, but loud enough to be annoying. When the car is in neutral, when revving the engine, it sounds good, no rattling, or buzzing, however, it seems like it doesn't rev properly. It doesn't rev up as quickly as what I've experienced with all my other cars over the years. It seems to have good low end power, but at higher revs, it just has no torque. These are two symptoms, but not sure whether or not they are related. I changed the tranny filter and oil, and also tried higher octane, and also Lucas fuel injector cleaner, but still the same. The magnet in tranny pan had the normal small bit of metal fine dust on it. I also changed the plugs in it as well, (nightmare)! When I have a chance, I will have a friend drive it, while I am in the back seat, with the door open and listening underneath to try to pinpoint the rattling underneath. Thanks so much for any help.
PS; I am glad to see that you have a reasonable donation requirement, at the bottom. I have no problem with that. Other sites that want to charge $25, $35 are way out of my league as I am a disabled vet. Thanks!
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Guest
March 10, 2013.



I would start with fuel pressure check, back pressure check on the cat converters.

Have them checked and we proceed.

Roy

ASEMaster6371
Mar 10, 2013.
Ok Roy, thanks! I have no pressure gage for fuel pressure check, so I will just replace fuel filter. As far as the converter being backed up, or checking them, I'm not sure about that either. I think you are right though, as far as the converters, because, there is no rattle sound when in neutral while revving, only when it has a load. I wonder why I'm not getting a code, because it is definitely not running correctly, when trying to pass someone. Absolutely no power at all, while pinging/rattling sound is happening. Can I just remove the cats? Or should I take somewhere and have them stick a probe into the exhaust and see what the readings are? Not sure. Thanks a bunch!

Tiny
Slick58
Apr 3, 2013.