Engine knocking during acceleration help!!
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Engine knocking during acceleration help!!
Hi There, I recently bought a 1964 F100 with a 292 Y Block. The odometer only reads 23,000 miles and its been refurbished. The stock engine has a double barrel Holley carb on it. It drove well for 5 weeks until this loud knocking began. It occurs when I give it gas and then slowly goes away once I am up to speed. It is loudest in 2nd and literally sounds like someone is hitting the firewall with a hammer. I already replaced the spark plugs but it did not help. I read that this could also be an issue with low octane fuel (which I made the mistake of using 87 recently). Could someone help me??? I'm happy to send a video of the noise as I give it gas. Thank you so much Ford Forum !!!!
Logistics Pro
Joined: May 2015
Posts: 4,463
Likes: 954
From: Tri Cities, TN
Those speedometers go to 99,000 then start over no telling how many miles are on it. Anything knocking that loud needs investigated and not driven until you sort it out. Pull the oil filter and cut it open and inspect it for metal. If there is metal in there the type and quantity will tell you where it came from. It sorta sounds like a bearing but who knows until you do some looking around.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
Welcome to FTE
Sorry to hear about the Unpleasantness. Been There, Done That, Got The T Shirt.
Are you familiar with what "spark knock" sounds like, and when or how it occurs?
If it's real bad, it can cause severe engine damage - bust piston ring lands, or holes in the top of pistons. Can WAG a couple things, but I would agree be very careful about driving it until things get checked out.
If it IS spark knock, it means the ignition timing is too far advanced. Did you mess with it?
Without first adjusting the ignition timing this normally can't really happen "out of the blue" unless the internal parts of the distributor have become defective. This is possible on a high mileage distributor. You'll need an ignition timing light, among other tools.
I would suggest a Ford Shop Manual, it has the Tune-Up information in it. There's a few "gotchas" you'll need to learn about too, Y-Blocks are a little bit different than the average V8. On the plus side, they are tough as nails and whatever the problem is, you'll soon have it purring nicely.
Sorry to hear about the Unpleasantness. Been There, Done That, Got The T Shirt.
Are you familiar with what "spark knock" sounds like, and when or how it occurs?
If it's real bad, it can cause severe engine damage - bust piston ring lands, or holes in the top of pistons. Can WAG a couple things, but I would agree be very careful about driving it until things get checked out.
If it IS spark knock, it means the ignition timing is too far advanced. Did you mess with it?
Without first adjusting the ignition timing this normally can't really happen "out of the blue" unless the internal parts of the distributor have become defective. This is possible on a high mileage distributor. You'll need an ignition timing light, among other tools.
I would suggest a Ford Shop Manual, it has the Tune-Up information in it. There's a few "gotchas" you'll need to learn about too, Y-Blocks are a little bit different than the average V8. On the plus side, they are tough as nails and whatever the problem is, you'll soon have it purring nicely.
Post Fiend
Joined: Apr 2002
Posts: 19,311
Likes: 97
From: Waterloo, Iowa
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FTE Legend
Joined: Nov 2015
Posts: 30,856
Likes: 4,106
From: Angier, NC
If he is still running points in the 292 he will need to check the point dwell before checking timing.
If the rubbing block has worn down, no grease on the block when installed, it can change the timing.
But you need to find & fix the cause of the noise before damage is done to the motor.
Dave ----
If the rubbing block has worn down, no grease on the block when installed, it can change the timing.
But you need to find & fix the cause of the noise before damage is done to the motor.
Dave ----
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