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Knocking Or Something Else?

G

GTowner2016

New member
So I bought a 01 GT, previous owner said the transmission was rebuilt 25k miles ago (can believe it, shifts like a dream). When the car has been sitting, I can crank it, and I hear nothing. Sounds good. I was driving it in warmer weather and it had an awful knocking sound, but what has me confused is whenever it is cool out, I can drive it about 4 miles and nothing, just hear the sound of the motor. If I turn it off, crank back up, with every stop, once I take off again, you hear a slight knock, which with a few stop signs later, take off has to be super slow because it's knocking like crazy.

The motor has to get really warm before it gets full on knocking. My dad has been a mechanic for 20 years, and said it also has him sort of stumped as he said every rod knock he has heard started as soon as the car was cranked up, and my last GP had a lifter ticking, which also started off the bat, but with warmer engine temps got better.

I am completely at a loss. I bought the car for a mere $1300 because the trim on the door and below the door is gone (door trim) and broken (below door). I expected something to 'pop' up as the car has new front struts, tie rod ends, and had a recent alignment. Inside was really great condition, but I would rather it have been something I could easily diagnose.
 






When the car is parked though, just idling it doesn't make any sounds but a very very faint tick, really unnoticeable unless you are listening for it. Then if you give it gas, when it reaches about 1500 rpm's the knock starts, stops when you let off the gas. The cv joint is bad, it pops horribly when turning deep though.
 
Here's a video of it in park after a 10 mile drive. It was parked for hours, was fine with no knock about half way home. Got stopped by a red light and when I took off it started and only got worse from there. At first start up of the day you can rev engine and whatnot and it won't knock at all. You have to drive it some before it starts. Any ideas at all? When I took this video, after stopping, when I revved to about 3k rpm it went away until it fell back down under 3k. Just stumps me because it isn't all the time.

 
that does sound like a rod knock. cold engine wont knock due to the oil being thick and cold still, once the oil warms up a knock will be heard louder.
 


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