440 knocking

jeff deakins · May 21, 2020

Installed ne intake,carb and upgraded to electronic ignition.Now car cranks fine runs good for about 10 seconds and then starts terrible knocking then will eventualy stall.I can let sit for a few minutes same thing happens.I have checked plug order and firing order found TDC. Help can't wrap m head around this one.

BeepBeepRR · May 21, 2020

Do you have a timing light? Check to see where it is at idle. Too far advanced or too late will cause weird things. Set it for 12 degrees BTDC and see what it runs like.

33 IMP · May 21, 2020

New intake right? Way off-the-wall guess. Are the intake bolts hitting the pushrods? (You wouldn't be the first)

68Moparmaniac · May 22, 2020

Intake vacuum leak maybe?

Nate S · May 22, 2020

Terrible knocking like pinging or terrible knocking like rod knock?

jeff deakins · May 22, 2020

Like rod

BLK 68 R/T · May 22, 2020

Guessing if there were no problems before, the the rod knock sound is probably “dieseling” Just before it stalls completely, it makes a loud knocking sound. I would go back to what work you have just done. Check the reluctor gap and that it’s tight, also the module in the distributor could be suspect.

BeatersRus · May 22, 2020

you didnt by any chance wire the distributor cap Backwards did you??
counterclockwise versus clockwise...?

WP29440SE · May 22, 2020

hopefully you didn't drop a bolt or something down an intake runner.
I would have to be there to hear the knock before I can suggest anything constructive. I've changed intakes/carbs and distributors a hundred times and I've never encountered anything like that.

Richard Cranium · May 23, 2020

Daves69 · May 23, 2020

A couple items I'd look at......
Pull those plugs and check 'em. I'd expect a stray item down a intake runner would make short work of one.
Recheck the plug wire set. If 5-7 are swapped it may run surprisingly well at idle.
Re-time with vac advance plugged. Does attaching vac advance cause the "knock"?
Oil pressure dropped? Drain and inspect the oil for bearing particles.

440 knocking

jeff deakins

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BeepBeepRR

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33 IMP

FBBO Gold Member

68Moparmaniac

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Nate S

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jeff deakins

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BLK 68 R/T

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BeatersRus

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WP29440SE

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Richard Cranium

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Daves69

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