Knocking noise does eventually stop after a few minutes. Happens in warm and cold temperatures.
Recirculate air flap by the sound of it ,,,,can be expensive repair ,if you can get to it wedge it open with a ciggy packet ,sorry i have no idea where it is as never seen one but i do this often with renaults which seem to develop this fault at regualr intervals
SOURCE: Loud knocking noise from engine
A loud low knock? And it sounds like a disel now, sounds like one of your rod bearings is going bad. Basically, unless you want to put a new motor in it or have the one in it rebuilt, the only thing you can do is drive it till it blows. Sorry to be the one to give you bad news like this, but your motor is old. Parts are worn out. You either have to freshen it up or let it die.
SOURCE: 2004 Nissan Quest - Engine chatter/knocking
Ther e is a chance your injectors are leakin g down and there is excess fuel in the cylinders. Not a good thing. So, you fuel pressure and injectors need chkg. good luck
SOURCE: period loud tapping noise right side of dash 2010 Taurus
could be one of the doors in the heater box
SOURCE: knocking under valve cover on cold starts
hi if it goes awat after a few seconds its a hydrolic lifter for one of the cames will go for years before it need replacing
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Sounds like the same problem I was having with my 2010 Caravan. It is the motor that controls the fresh air/ rec. air flap. You can get to this by the underneath. Remove 2 screws that hold the carpet up by the firewall and the plastic fastener in the front by the glove box. The motor box is mounted on the side of the flap. Held by 2 screws and 2 wires are plugged into it. I just took mine off opened the cover to inspect the plastic gears, the gears looked good so I replaced the cover and re installed. The thumping sound went away. Everyone is saying that you have to take the dash out and dealerships are charging upwards to 800 dollars for the fix. It took me 10 min to get to it and remove. If the part needs replaced I believe it around 25$.
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