351W stalls when selecting drive

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Author Topic: 351W stalls when selecting drive  (Read 4477 times)

Online Woz

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Re: 351W stalls when selecting drive
« Reply #25 on: December 15, 2023, 01:14:27 pm »
Haven’t got to transmission yet, just want it to idle and go into gear.
We think it was used for drag racing,
Had a 2point roll cage, now removed.
Traction bars, 9 inch diff and disc brake assembly,
10 inch wheels on the rear
The hot motor, BM Shifter.
Has a C5 according to the paperwork

New Battery, cables ok, turns over rapid before starting.

Good video on BM Shifter adjustment, will look into that and check why it starts in gear.

The issue could be it needs a medium stall converter,
Is there any way to tell what it has, without removing the transmission?

Thanks
Woz

Offline GEOFF289

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Re: 351W stalls when selecting drive
« Reply #26 on: December 15, 2023, 01:23:06 pm »
Doesn't the NSS only prevent the starter circuit of the car, I don't believe it can interrupt the ignition circuit....?

Good point Jeff and I mostly retract my thought bubble. While it might be nothing to do with his problem, the NSS situation clearly needs addressing anyway and it does seem the wiring of this car has been messed with a fair bit so who knows. 

Offline AussiePhil

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Re: 351W stalls when selecting drive
« Reply #27 on: December 15, 2023, 01:36:25 pm »
Doesn't the NSS only prevent the starter circuit of the car, I don't believe it can interrupt the ignition circuit....?

Good point jiffy,
Long winded post this one.

Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: 351W stalls when selecting drive
« Reply #28 on: December 15, 2023, 01:51:34 pm »


The issue could be it needs a medium stall converter,
Is there any way to tell what it has, without removing the transmission?

Thanks
Woz
Hey Woz,

You’ll need the car going first.

Foot flat on brake, start engine, put into gear, and put the accelerator down, converter will fill up and you’ll noticed the engine struggle at an RPM!
This link is basically how you can tell.

https://youtube.com/shorts/FIy770aWvcU?si=_zA7CkSneCOULU1o

Cheers Phil
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline FB.65.68.70

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Re: 351W stalls when selecting drive
« Reply #29 on: December 16, 2023, 11:22:18 am »
Hi Woz,
a couple of things to consider. What really do you want to do with this car?  Race it, cruise it, short trips of day outings with friends, say a few 100 klms ?
To understand that is important, is fuel mileage an issue for you?   Believe me if you have a wicked motor, a diff ratio that makes sense in the qtr mile but gives crappy mileage if your doing a long run, you wont be happy with the car.

So make your mind up first.
Check what diff ratio is in the car, is it for cruising or racing.
Then if its race you want buy the parts that make sense, a torque convertor with say 2200 or higher . Or perhaps if want just to cruise and the compression and intake etc will facilitate it, change to a milder grind cam for cruising. But you really need to understand what you want from the mustang first


Online Woz

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Re: 351W stalls when selecting drive
« Reply #30 on: December 16, 2023, 10:19:45 pm »
Hey Phil,

Will do the converter stall test on my car ( 289 C4) first and  then on the 351 C5 and compare, never done it before.

I think the owner just wants to get the car drivable, then if not too costly, get it registered, maybe keep it for a while and then sell it.
Good point on the diff ratio, will include that on the check list.

Thanks
Woz

Offline AussiePhil

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Re: 351W stalls when selecting drive
« Reply #31 on: December 17, 2023, 08:02:36 am »
Try connecting a temporary wire from the positive side of the coil to the positive side of the battery.
Also you could try connecting a jumper lead from the engine to the negative side of the battery.
 :bolt:
Hey Woz,

You said you couldn’t do this because battery in boot, but just a positive to your starter solenoid and negative to engine block or chassis. Cable run from boot needs to be at least 70mm2 or better.
Is your alternator making 13.4 volts and well earthed.
You don’t have something electrical in run position down to earth drawing to much voltage draining voltage from coil.
Have you a good size earth strap from the engine to chassis, use WD40 loosen and retighten.
Have you got good spark, what’s the dizzy again, have you tried to run the engine on Aerostart to see if it’s fuel or spark.
You haven’t done something silly like mixing up the plug leads?
Do you have a bad ignition switch, losing 12V back on run after start.
Have you run a multimeter over everything especially coil and run wire.

Eventually you’ll have to return your carburettor to your car, what is the original carburettor and have you disassembled it yet and is it serviceable. Maybe just something simple! Clogged screen, jets or stuck floats or float valve, incorrect float level etc.

You did mention two carburettors, early in post 1403 (2 step electric chock) and later in post a 1404 (manual chock), The electric chock is preferable if you able to set 12v from ignition switch.

Cheers Phil



Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: 351W stalls when selecting drive
« Reply #32 on: December 17, 2023, 11:14:22 am »
Hey Woz,
Only thing left unmentioned is fuel pump or strainer in tank?
Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline GLENN 70

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Re: 351W stalls when selecting drive
« Reply #33 on: December 18, 2023, 08:42:38 am »
If it has a hot cam as you say ,it needs a hi stall converter.  The way to tell how big the converter is you need to drive the car at say 60 kph in 2 nd gear , and floor it , and watch the tachometer and see what it jumps up to , till it stops then that’s what the converter size .it’s called flashing the converter . Putting you foot on the brake is not the correct way .  If it needs a converter don’t buy a cheap eBay one .  I need details on the car before you determine the size needed . I run a 4,000 rpm in my mach 1 .

Offline AussiePhil

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Re: 351W stalls when selecting drive
« Reply #34 on: December 18, 2023, 11:37:03 am »

One strange thing I noticed today, when i put my foot on the brake, the car stalled, doesn't have brake booster.



Thanks
Woz

Woz, do you have a shorted brake wire!

Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Online Woz

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Re: 351W stalls when selecting drive
« Reply #35 on: December 18, 2023, 12:54:29 pm »
Going there tomorrow,
Will refit the carby ( Edelbrock 1405 600cfm)
Check if it will idle, if it does, press the brake pedal and see if it stalls. If it does, could be brake short somewhere.

If it doesn’t stall, will try the converter stall test.
Can’t do Glenn 70 test, car unregistered.

Will take my multimeter and check everything as suggested
Battery cable is standard 4 gauge, no pump in the fuel tank, just the standard pump on the block.

Will report on tomorrow’s progress

Thanks
Woz

Offline GLENN 70

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Re: 351W stalls when selecting drive
« Reply #36 on: December 18, 2023, 02:47:09 pm »
You can do a bit of a converter test by putting the hand brake on and your foot hard on the brakes and some bricks in front of the front wheels in a safe area , and see what happens ,but it’s only as good as the brakes will be .

Offline AussiePhil

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Re: 351W stalls when selecting drive
« Reply #37 on: December 18, 2023, 03:42:14 pm »
Going there tomorrow,

Battery cable is standard 4 gauge, no pump in the fuel tank, just the standard pump on the block.



Thanks
Woz

Hey Woz,

Cable in boot must be 50mm2 or the size of industrial welding cable direct to starter solenoid unless you’ve got the new type starter motor with its own solenoid.

The cable runs to the boot on mine is 70mm2 about 3 1/2 metres long, it runs to my starter motor solenoid on the starter motor then onto 200amp alternator, I used a standard Bosch 12v relay to initiate start!

A good general rule-of-thumb figure is one amp starter draw for every cubic inch of motor.

You have a sock filter in your fuel tank attached to the pickup!

Cheers Phil.
« Last Edit: December 18, 2023, 05:16:42 pm by AussiePhil »
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: 351W stalls when selecting drive
« Reply #38 on: December 18, 2023, 03:52:01 pm »
Hey Woz,
You do have Automatic Transmission Fluid in the transmission not gear oil.

Just checking.
Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!

Offline AussiePhil

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Re: 351W stalls when selecting drive
« Reply #39 on: December 18, 2023, 04:40:43 pm »
Hey Woz,

torque converter seized?

Cheers Phil.
If you've never buggered anything you've never done anything!
But if you've buggered a lot maybe you're not very good at it!

Two for one is good but four for two is better!