The Ford Barn

Dude81 · 08-08-2022, 12:46 PM

57 Fairlane Sunliner with 312, Ford 4-barrel, and auto trans runs very rough when accelerating, especially at low speed. Causes car to shake. Does not occur unless car is in gear. Installed new U-joints and rear trans mount (engine mounts appear OK). No improvement. Engine has always "ticked" on passenger side--worse when idle and cold. Non ethanol 91 used. Suggestions?

dmsfrr · 08-08-2022, 01:38 PM

Could the transmission be slipping, not engaging properly?

Ticking noise on the passenger side...
Have the pushrods and valves been checked & adjusted recently?
See this link...
https://www.youtube.com/watch?v=SqG-Q_kVI3s
.

KULTULZ · 08-08-2022, 04:05 PM

- IMO -

You need to diagnose the engine as to tune.

What carb does it have and how long since any engine work.

paul2748 · 08-08-2022, 08:13 PM

How about engine mounts ?

Dude81 · 01-22-2023, 06:51 PM

Thanks for the advice. Currently preparing to rebuild or replace the Carb (came from a 58 332/352).

fordor41 · 01-22-2023, 11:21 PM

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Quote:

Originally Posted by dmsfrr

Could the transmission be slipping, not engaging properly?

Ticking noise on the passenger side...
Have the pushrods and valves been checked & adjusted recently?
See this link...
https://www.youtube.com/watch?v=SqG-Q_kVI3s
.

so I watched the video but he didn't start the engine. I scrolled down to another video he had where he adj. the valves on a for pick-up and started it up. OMG, if our Y-block sounded like that I'd s**t. other than a small tick on the pass. side when cold , our 292 Y-block sounds like a hyd. lifter engine. close the hood and can barely hear it run.

dmsfrr · 01-22-2023, 11:51 PM

Quote:

Originally Posted by Dude81

. . . Engine has always "ticked" on passenger side--worse when idle and cold. ...

Exhaust manifold leak?

40 Deluxe · 01-22-2023, 11:54 PM

Sounds like misfire under load. Coil could be weak. It only takes 5,000 volts or less to fire a plug at idle, whereas it will take 25,000 or more volts to fire a plug under load. The plug wires could be bad and leaking some of that higher voltage needed under load. Could be a bad condenser. Someone could have put too small main jets in the carb, or float level could be too low. Jets or passages in the carb could be plugged. Point gap could be off. Fuel pump could be weak. Fuel filter or fuel lines could be partially plugged.
Do a thorough tune-up. Do not assume anything. Make a check list and mark off every item until it runs smooth.

Flathead Fever · 01-23-2023, 12:22 AM

It's hard for me to know what shaking means. Is it shaking in the steering wheel? Where does the shaking feel like it's coming from? How bad is this shake? Is it an actual shake, a vibration or an engine running bad. A ticking lifter is not going to cause a shake in the chassis. A video would helpful. Did it always have this shake, did it start after something was changed?

Under acceleration the engine could torque to one side enough to allow metal to metal contact between the engine and something, and you could feel a vibration. Like if you had tight fitting headers that move far enough to touch part of the chassis. Can you have somebody you trust, put it in gear, set the parking brake and hold the brakes on while you stand to the "side" and give it a little gas and see if that engine is moving enough to make contact with something. Don't' you dare walk in front of it during the test.

scicala · 01-23-2023, 11:51 AM

It sounds more like a weak ignition problem to me.

Sal

dmsfrr · 01-23-2023, 01:25 PM

When did the car last have a basic tune-up?
Re-set the points & timing, clean or replace the sparkplugs, etc...

oldbugger · 01-23-2023, 01:29 PM

Always check the plugs first, look at the color, should be tan.

CSPIDY · 01-25-2023, 08:16 PM

Quote:

Originally Posted by oldbugger

Always check the plugs first, look at the color, should be tan.

I agree, ticking could be a bad plug

paul2748 · 01-25-2023, 08:20 PM

How about a bad vacuum hose or a disconnected vacuum hose? Check ll the hoses to make sure hey are in good condition. There are vacuum hoses under the dash.

oldbugger · 02-02-2023, 10:37 AM

Any updates, we would like to know what you found

KULTULZ · 02-02-2023, 01:14 PM

You need to throw a vacuum gauge on it (IMO)

Ford blue blood · 02-04-2023, 09:55 AM

I'm going with week spark. At idle the fire makers don't much care how hot the spark is, under load a week spark will cause multiple mis-fires.

KULTULZ · 02-04-2023, 07:47 PM

- I Can Name That Tune In Ten Posts! -

oldbugger · 02-15-2023, 08:21 PM

HEY dude, whats up

Dude81 · 02-20-2023, 07:04 PM

Update: not so good. Sent the carb (a 1958 Ford 4100) off for a rebuild. Installed when it came back. Engine very hard to start and when finally did, it coughed, sputtered, backfired and then died. I tested the fuel pump by removing a line and watching the flow--looked good. Tested one spark plug and it fired ok once per revolution. Plug was slightly sooty, probably from over rich carb before the rebuild. Multimeter test on coil (Pertronix Flamethrower 3.0 ohm) showed 3.5 ohms between primary contacts, and 78000 ohms between contact and output (is that bad? I don't know what it should be). Coil is getting the full 12V needed. Distributor cap looks clean and solid. Points have been replaced by a Pertronix Igniter module. I'm researching how to test this. Any advice is appreciated. Also, if I decide to replace the coil and/or igniter, does anyone have suggestions? Thanks again.

08-08-2022, 12:46 PM	#1
Dude81 Junior Member Join Date: Jan 2016 Location: NC Posts: 7	57 with 312 rough when accelerating 57 Fairlane Sunliner with 312, Ford 4-barrel, and auto trans runs very rough when accelerating, especially at low speed. Causes car to shake. Does not occur unless car is in gear. Installed new U-joints and rear trans mount (engine mounts appear OK). No improvement. Engine has always "ticked" on passenger side--worse when idle and cold. Non ethanol 91 used. Suggestions?

08-08-2022, 01:38 PM	#2
dmsfrr Senior Member Join Date: Aug 2012 Location: Abq, NM Posts: 3,725	Re: 57 with 312 rough when accelerating Could the transmission be slipping, not engaging properly? Ticking noise on the passenger side... Have the pushrods and valves been checked & adjusted recently? See this link... https://www.youtube.com/watch?v=SqG-Q_kVI3s . Last edited by dmsfrr; 08-08-2022 at 01:50 PM. Reason: add link

08-08-2022, 04:05 PM	#3
KULTULZ Senior Member Join Date: Aug 2012 Location: IN A GALAXIE FAR, FAR AWAY Posts: 7,386	Re: 57 with 312 rough when accelerating - IMO - You need to diagnose the engine as to tune. What carb does it have and how long since any engine work. __________________ ***** "Last Sunday, I caught him makin' eyes at Idell Bushey durin' preachin'. And I know what they do up there in the hills when they say they're possum huntin'. They're just sittin' around the campfire, drinkin' hard cider, hittin' each other on the shoulder and hollerin' 'flinch!'." ― Charlene Darling (Daughter of Briscoe Darling)

08-08-2022, 08:13 PM	#4
paul2748 Senior Member Join Date: May 2010 Location: Midland Park, NJ Posts: 4,290	Re: 57 with 312 rough when accelerating How about engine mounts ? __________________ 48 Ford Conv 56 Tbird 54 Ford Victoria

01-22-2023, 06:51 PM	#5
Dude81 Junior Member Join Date: Jan 2016 Location: NC Posts: 7	Re: 57 with 312 rough when accelerating Thanks for the advice. Currently preparing to rebuild or replace the Carb (came from a 58 332/352).

01-22-2023, 11:54 PM	#8
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,818	Re: 57 with 312 rough when accelerating Sounds like misfire under load. Coil could be weak. It only takes 5,000 volts or less to fire a plug at idle, whereas it will take 25,000 or more volts to fire a plug under load. The plug wires could be bad and leaking some of that higher voltage needed under load. Could be a bad condenser. Someone could have put too small main jets in the carb, or float level could be too low. Jets or passages in the carb could be plugged. Point gap could be off. Fuel pump could be weak. Fuel filter or fuel lines could be partially plugged. Do a thorough tune-up. Do not assume anything. Make a check list and mark off every item until it runs smooth.

01-23-2023, 12:22 AM	#9
Flathead Fever Senior Member Join Date: May 2010 Location: Yucaipa, CA Posts: 1,360	Re: 57 with 312 rough when accelerating It's hard for me to know what shaking means. Is it shaking in the steering wheel? Where does the shaking feel like it's coming from? How bad is this shake? Is it an actual shake, a vibration or an engine running bad. A ticking lifter is not going to cause a shake in the chassis. A video would helpful. Did it always have this shake, did it start after something was changed? Under acceleration the engine could torque to one side enough to allow metal to metal contact between the engine and something, and you could feel a vibration. Like if you had tight fitting headers that move far enough to touch part of the chassis. Can you have somebody you trust, put it in gear, set the parking brake and hold the brakes on while you stand to the "side" and give it a little gas and see if that engine is moving enough to make contact with something. Don't' you dare walk in front of it during the test.

01-23-2023, 11:51 AM	#10
scicala Senior Member Join Date: Jun 2010 Location: Detroit suburb, MI Posts: 3,794	Re: 57 with 312 rough when accelerating It sounds more like a weak ignition problem to me. Sal

01-23-2023, 01:25 PM	#11
dmsfrr Senior Member Join Date: Aug 2012 Location: Abq, NM Posts: 3,725	Re: 57 with 312 rough when accelerating When did the car last have a basic tune-up? Re-set the points & timing, clean or replace the sparkplugs, etc...

01-23-2023, 01:29 PM	#12
oldbugger Senior Member Join Date: May 2010 Location: Holland Mi Posts: 705	Re: 57 with 312 rough when accelerating Always check the plugs first, look at the color, should be tan.

01-25-2023, 08:20 PM	#14
paul2748 Senior Member Join Date: May 2010 Location: Midland Park, NJ Posts: 4,290	Re: 57 with 312 rough when accelerating How about a bad vacuum hose or a disconnected vacuum hose? Check ll the hoses to make sure hey are in good condition. There are vacuum hoses under the dash. __________________ 48 Ford Conv 56 Tbird 54 Ford Victoria

02-02-2023, 10:37 AM	#15
oldbugger Senior Member Join Date: May 2010 Location: Holland Mi Posts: 705	Re: 57 with 312 rough when accelerating Any updates, we would like to know what you found

02-02-2023, 01:14 PM	#16
KULTULZ Senior Member Join Date: Aug 2012 Location: IN A GALAXIE FAR, FAR AWAY Posts: 7,386	Re: 57 with 312 rough when accelerating You need to throw a vacuum gauge on it (IMO) __________________ ***** "Last Sunday, I caught him makin' eyes at Idell Bushey durin' preachin'. And I know what they do up there in the hills when they say they're possum huntin'. They're just sittin' around the campfire, drinkin' hard cider, hittin' each other on the shoulder and hollerin' 'flinch!'." ― Charlene Darling (Daughter of Briscoe Darling)

02-04-2023, 09:55 AM	#17
Ford blue blood Senior Member Join Date: Jul 2011 Location: Birmingham, AL Posts: 883	Re: 57 with 312 rough when accelerating I'm going with week spark. At idle the fire makers don't much care how hot the spark is, under load a week spark will cause multiple mis-fires. __________________ Bill, certified Ford nut. 2024 F-150 2018 Lincoln MKZ 2016 Focus 1961 Comet S-22 1956 Ford Crown Victoria 36 Chevy, 351C/FMX, 8", Mustang II

02-04-2023, 07:47 PM	#18
KULTULZ Senior Member Join Date: Aug 2012 Location: IN A GALAXIE FAR, FAR AWAY Posts: 7,386	Re: 57 with 312 rough when accelerating - I Can Name That Tune In Ten Posts! - __________________ ***** "Last Sunday, I caught him makin' eyes at Idell Bushey durin' preachin'. And I know what they do up there in the hills when they say they're possum huntin'. They're just sittin' around the campfire, drinkin' hard cider, hittin' each other on the shoulder and hollerin' 'flinch!'." ― Charlene Darling (Daughter of Briscoe Darling) Last edited by KULTULZ; 02-04-2023 at 07:53 PM.

02-15-2023, 08:21 PM	#19
oldbugger Senior Member Join Date: May 2010 Location: Holland Mi Posts: 705	Re: 57 with 312 rough when accelerating HEY dude, whats up

02-20-2023, 07:04 PM	#20
Dude81 Junior Member Join Date: Jan 2016 Location: NC Posts: 7	Re: 57 with 312 rough when accelerating Update: not so good. Sent the carb (a 1958 Ford 4100) off for a rebuild. Installed when it came back. Engine very hard to start and when finally did, it coughed, sputtered, backfired and then died. I tested the fuel pump by removing a line and watching the flow--looked good. Tested one spark plug and it fired ok once per revolution. Plug was slightly sooty, probably from over rich carb before the rebuild. Multimeter test on coil (Pertronix Flamethrower 3.0 ohm) showed 3.5 ohms between primary contacts, and 78000 ohms between contact and output (is that bad? I don't know what it should be). Coil is getting the full 12V needed. Distributor cap looks clean and solid. Points have been replaced by a Pertronix Igniter module. I'm researching how to test this. Any advice is appreciated. Also, if I decide to replace the coil and/or igniter, does anyone have suggestions? Thanks again.