OK let's do a little check. with the car in a clear area and no kid's or anyone around the car get in and start the engine.Now do you hear the noise with the car sitting at an idle.Let's say yes then put your foot on the brake and put the car in gear do you hear the knock if so hold the brake secure make sure no one is in front of the car and apply the gas lightly if the noise stop's then you have a loose torque converter to flywheel the bolt's are not tight..Now if you hear the knock and it's high pitch metallic then chance's are it's a rod or lifter in the engine.If the noise is a thumping dull noise you have a bad crankshaft.My guess is the torque converter because you said the transmission was worked on and a lot of time's without Loctite and the proper tourque the converter bolt's will work loose.GOOD LUCK HOPE THIS HELP'S
SOURCE: Sluggish and no pwer up a hill. Almost backfiring in second gear.
Yea probably the bad gas clogged the filter or clogged an already dirty fuel filter. Try changing it. If not I would say try using a lower gear by turning off the overdrive.
SOURCE: 2006 expedition knocks at 40-45 MPH
Toss a couple cans of engine medic into your gas tank and I bet you will solve alot of your problem
SOURCE: my car wont start it makes a clicking sound when
Sounds like your battery is dead. Take it to a local auto parts store and have them check the alternator.
SOURCE: My 1997 Ford Explorer Eddie
It could be rod knock: if so, plan on an engine change/rebuild. On my 97 F 250, 5W motor oil is recommended,so you can't put in heavier oil. But that's not a solution. Something mechanical is askew.
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