Bad Vibration at Idle
#2897744
03/10/21 02:31 PM
03/10/21 02:31 PM
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Joined: Jun 2005
Posts: 1,534 Florida
CHRGR69
OP
pro stock
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OP
pro stock
Joined: Jun 2005
Posts: 1,534
Florida
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69 Charger 440 4bbl 727 trans. Not just an idle out of adjustment, but almost a rotational vibration. Damper looks good. ??
Last edited by CHRGR69; 03/10/21 02:48 PM.
Grandma always said I had "hands of gold"!
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Re: Bad Vibration at Idle
[Re: CHRGR69]
#2897751
03/10/21 02:55 PM
03/10/21 02:55 PM
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Joined: Jan 2003
Posts: 8,403 Highland, MI.
Sunroofcuda
master
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master
Joined: Jan 2003
Posts: 8,403
Highland, MI.
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Does it just do this while idling?
I bought a '72 Charger in AZ. back in the 80's with a 400 2-bbl that had a vibration at all RPM's. I sold the car to a customer before we ever got it figured out, but several guys were saying they thought it was the flex plate.
No Man With A Good Car Needs To Be Justified
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Re: Bad Vibration at Idle
[Re: CHRGR69]
#2897760
03/10/21 03:08 PM
03/10/21 03:08 PM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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Is this something that just recently started? Or is this a fresh build?
Last edited by an8sec70cuda; 03/10/21 03:09 PM.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Bad Vibration at Idle
[Re: CHRGR69]
#2897780
03/10/21 03:37 PM
03/10/21 03:37 PM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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If it has good oil pressure and isn't making any knocking sounds, then pop the inspection cover off of the bellhousing and bump the engine over so you can look at the flexplate. It may have cracked. I'd also verify that the balancer hasn't slipped the outer ring.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Bad Vibration at Idle
[Re: an8sec70cuda]
#2897866
03/10/21 07:30 PM
03/10/21 07:30 PM
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Joined: Jun 2005
Posts: 1,534 Florida
CHRGR69
OP
pro stock
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OP
pro stock
Joined: Jun 2005
Posts: 1,534
Florida
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What is good oil pressure??
Grandma always said I had "hands of gold"!
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Re: Bad Vibration at Idle
[Re: CHRGR69]
#2898055
03/11/21 09:24 AM
03/11/21 09:24 AM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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What is good oil pressure?? Depends on what oil pump is on it. If it has a stock pump, then probably 15 psi or so at hot idle and 40+ at speed. A high volume pump will be at least 20 psi hot idle and 60+ at speed. Of course this can vary if someone has messed w/ the relief spring and/or bearing clearances. Checking your timing is another way to easily see if they balancer has slipped. If the timing light is telling you the timing is different now than where you previously set it...it's time to get #1 at true TDC and verify the timing mark.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Bad Vibration at Idle
[Re: NITROUSN]
#2898073
03/11/21 10:04 AM
03/11/21 10:04 AM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,385
Marion, South Carolina [><]
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Unless the poster has a newer cast crank external balanced engine a slipped internal balanced engines balancer will not cause a vibration. Yes, unless it's slipped BAD and is about to come apart/fall off. I mean like the outer ring is wobbling...but he did say it looks OK though didn't he? So yeah, the damper shouldn't be the issue if it's neutral balance. Unless there's an issue w/ the flexplate or torque converter, it's gonna be time to tear into the motor.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Bad Vibration at Idle
[Re: an8sec70cuda]
#2898126
03/11/21 11:46 AM
03/11/21 11:46 AM
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Joined: Aug 2019
Posts: 9,557 Super Spudsville
Mr PotatoHead
Half Baked
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Half Baked
Joined: Aug 2019
Posts: 9,557
Super Spudsville
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Simple firing order error?
Is there a miss, have you looked under the valve covers.... lifter popped out? Miss adjusted valves/preload?
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