Weird engine noise under quick load. (Video links)
#1
Weird engine noise under quick load. (Video links)
Hey all, happy Friday.
I tuned the carb and idle for sea level and adjusted the timing to obtain a nice 20 pounds of vacuum.
car idles and runs greats. Had much faster pull.
but I have this weird noise from the engine bay under a quick load. So not a high load, like if I lean into a gear slowly and go up on the rpm’s, but quick throttle blips. At first I thought it was the carb, but it doesn’t do it in idle. I overfilled the power steering fluid and it oozed out when I got home, so maybe the lid under pressure? What about the tranny?
thanks for the help.
https://photos.app.goo.gl/WBoeCcoTptvT6Qm28
https://photos.app.goo.gl/1XYxXENCXP6nBWXD8
I tuned the carb and idle for sea level and adjusted the timing to obtain a nice 20 pounds of vacuum.
car idles and runs greats. Had much faster pull.
but I have this weird noise from the engine bay under a quick load. So not a high load, like if I lean into a gear slowly and go up on the rpm’s, but quick throttle blips. At first I thought it was the carb, but it doesn’t do it in idle. I overfilled the power steering fluid and it oozed out when I got home, so maybe the lid under pressure? What about the tranny?
thanks for the help.
https://photos.app.goo.gl/WBoeCcoTptvT6Qm28
https://photos.app.goo.gl/1XYxXENCXP6nBWXD8
#2
This is good video of it with hood open and brake+throttle. Engine warm.
https://photos.app.goo.gl/ZReZet6psNGs3BNn6
https://photos.app.goo.gl/ZReZet6psNGs3BNn6
#3
Neutral, no load. Revs fine
https://photos.app.goo.gl/d4gyFkJcq9UY71r3A
under load again, from passenger side, no air intake on
https://photos.app.goo.gl/KDivyckHYybGyvL4A
https://photos.app.goo.gl/d4gyFkJcq9UY71r3A
under load again, from passenger side, no air intake on
https://photos.app.goo.gl/KDivyckHYybGyvL4A
#5
I fixed it by backing down timing, I did so little by little until I didn’t get the clacking at near WOT.
I also changed the plugs and wires because they looked pretty old. Got NGK and Napa wires. They did well
car ran great today. So I’m happy.
i do have a decent leak at the bell housing which is new. The oil I put in is relatively thin, according to others (10-30)
so I was gonna do some thicker stuff but I’m in SoCal.
#6
10W-30 should be fine for a stock-ish engine with more-or-less factory clearances. How's the oil pressure? Regardless, I doubt that going heavier will seal up your leak. Out of curiosity, you didn't just switch from dino oil to synthetic, did you?
#7
I'm not sure what the PO used (It was his dads car who passed, but he was a proponent of synthetic himself) and I have always used Mobile 1 synthetic with high zinc content.
I heard from others on here to run 20-40 or something similar. The engine is factory, it was bored .030 over and has 455 components in it. Cam doesn't sound too aggressive. And compression is 179-181 all the way around.
I heard from others on here to run 20-40 or something similar. The engine is factory, it was bored .030 over and has 455 components in it. Cam doesn't sound too aggressive. And compression is 179-181 all the way around.
#9
I changed the valve cover gaskets, got a good look inside and checked the lash. And the oil pan bolts were pretty loose. I tightened those down.
so far nothing leaking right now. I’ll let the car idle tomorrow and see.
thanks for the feedback, you guys are great.
#10
I'm suspicious adjusting the timing didn't fix the entire issue. It sounds like a cracked/broken/warped flex plate or loose attachment bolts. I watched the videos carefully, it only happens under load while you're brake torquing the engine & in particular (while driving) it occurs under light load. Remove the bell housing cover & use a very bright flashlight to examine the flex plate & hardware. Look for any suspect areas. If possible, have someone in the car performing same brake torquing you performed while you listen in the area of the torque converter/flex plate/starter.
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May 23rd, 2023 02:53 PM