Eric Rose
Famous Member
Now that I have my cooling issue worked out I'm able to open the Falcon up on the highway. When I get up to speed and let off the throttle, I get a knocking sound. It sounds kind of like knocking rods, but its more of a thin, tinny sound and there's no vibration like knocking rods. I just had the motor rebuilt by a reputable machine shop and it runs very smooth, even when the noise occurs. It also runs cool and has great oil pressure (40lbs at cruising speed)
The transmission is a different story, however. It worked fine as it came in the car but when we changed the filter there was a large chunk of debris (piece of a broken band?) in the pan. We put it back together just to see what it would do. It operated good for a while but then it began leaking fluid like a sieve and now it sometimes slips when going into gear and doesn't shift right until its warmed up.
I usually cruise at 60mph/2500rpm. When I let off the throttle I hear the noise. If I let the RPM's drop some the noise will continue untill it drops down to 2000 rpm. Accelerating will make the noise go away. Shifting to neutral will also make the noise go away.
I read in another post that having a cracked flexplate can cause it to have symptoms similar to a knocking rod. I checked out the flexplate when I installed it and din't see any cracks but it was used and may have cracked after I put it in.
I'm also having a problem with starting the engine. It doesn't want to start unless I prime it with gas. Once I prime it with gas and let it get warm it runs fine. I have tried pumping the accelerator a few times both before and during turning over the starter, that doesn't do any good. How can it get gas once its running but not when I'm starting it?
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The transmission is a different story, however. It worked fine as it came in the car but when we changed the filter there was a large chunk of debris (piece of a broken band?) in the pan. We put it back together just to see what it would do. It operated good for a while but then it began leaking fluid like a sieve and now it sometimes slips when going into gear and doesn't shift right until its warmed up.
I usually cruise at 60mph/2500rpm. When I let off the throttle I hear the noise. If I let the RPM's drop some the noise will continue untill it drops down to 2000 rpm. Accelerating will make the noise go away. Shifting to neutral will also make the noise go away.
I read in another post that having a cracked flexplate can cause it to have symptoms similar to a knocking rod. I checked out the flexplate when I installed it and din't see any cracks but it was used and may have cracked after I put it in.
I'm also having a problem with starting the engine. It doesn't want to start unless I prime it with gas. Once I prime it with gas and let it get warm it runs fine. I have tried pumping the accelerator a few times both before and during turning over the starter, that doesn't do any good. How can it get gas once its running but not when I'm starting it?
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