351W stalls at traffic lights

Jaha95 · Jul 9, 2020

Hi guys!

Ive got a 69 351w with FMX tranny and every time i take og for a drive og Will stall on me.
I can stop at a traffic light and after 5-10 seconds the rpm will drop from 700 to 250 and then stall.
If im quickly i han put in Neutral and keep it Running.
Ive also noticed that when i go from park to Drive, the car tries to jump forward

Can it be my converter in the way out?

Current things checked:
Oil level on the transmission
Aluminium radiator mounted (the coolant temp was a bit too high for me)
Rebuild carburator
New fuel pump
Checked timing and set to 10 degrees
New plugs gapped to 0.030

Oh and the current setup
0.30 over bore
Ported heads
Edelbrock 600cfm carb
Edelbrock rpm intake
Pertronix flame Thrower coil
Pertronix ignitor 3
Lunati barebones 280/290
Holley high flow mechanical fuel pump
Hooker headers

DBegley · Jul 9, 2020

My 68 302 does that especially when it first gets started up. I think its a carb issue. My car is a 4 speed so I can control the idle with the clutch in. I put a new Holley carb in last summer. Been tweaking the settings but would like someone that knows carbs better than me check it.

7991LXnSHO · Jul 9, 2020

I do not know the carb make and model, so this will be general advice. The idle circuit might be partially clogged, and the idle mixture screws could need adjusted. After those issues are addressed, the idle speed screw should need adjusted.

2Blue2 · Jul 9, 2020

7991LXnSHO said:
The idle circuit might be partially clogged, and the idle mixture screws could need adjusted

yes that is most likely
and or dirty fuel filter. Old car with old tank and lines? Tank not venting properly. Vac leak.

Jaha95 said:
Edelbrock 600cfm carb

This carb not as picky as a holley when it comes to dirt but still can happen.

7991LXnSHO · Jul 9, 2020

I skipped that line about the carb. Yes, vacuum leaks are also a common cause of idle issues. Check the base gasket and any caps, too. Does this transmission have a vacuum line to a regulator?

Jaha95 · Jul 9, 2020

7991LXnSHO said:
I do not know the carb make and model, so this will be general advice. The idle circuit might be partially clogged, and the idle mixture screws could need adjusted. After those issues are addressed, the idle speed screw should need adjusted.

Its an edelbrock 1405 600cfm
Ive already har the carb apart for a rebuild, so i dont Think the carb is clogged

Ive tried setting the idle screws to 2,5 turns out and adjusting in for the maximum vacuum and ends at about 2 turns.
Am i Going too lean?

2Blue2 said:
yes that is most likely
and or dirty fuel filter. Old car with old tank and lines? Tank not venting properly. Vac leak.

This carb not as picky as a holley when it comes to dirt but still can happen.

Fuel filter has been changed, same goes for the lines, so i dont believe that fault is there

Ive just tried a vacuum meter on the inlet of the carb to check the vacuum, im Running About 14 Hg, when in drive, is it too low?

7991LXnSHO said:
I skipped that line about the carb. Yes, vacuum leaks are also a common cause of idle issues. Check the base gasket and any caps, too. Does this transmission have a vacuum line to a regulator?

Ive just tried to change intake + carb gasket and no change

When you sat Line to regulator?
I have a Line Running from a T-piece in the intake to the tranny?

Ill try to have Another look after a vacuum leak

rbancy · Nov 8, 2020

are you still having that problem ? i had the same problem before and running the same application as you. Just get a flat head and turn your idle up a bit. 800 at park should be good.

rbancy · Nov 8, 2020

its not your converter its your carb needs adjusting..

Jaha95 · Nov 9, 2020

After alot of head straching i ended out converting it from a auto to a manual, and That sorted it out!
No more stalling

rbancy · Nov 9, 2020

well anways probably a good thing anways. I have a fmx with a newly built 302, having issues with it. Needs to drive around the block for 5 to 10 minutes and warm it up ( probably has to do with the pump, fluids, and seals need to be warm ) before it actually drives. Otherwise can be at 4000 rpm and barely move. So good call on the switch. Im eventually going to do that as well but probably with a built c4.

351W stalls at traffic lights

Jaha95

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DBegley

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7991LXnSHO

wanna catch the space herp

2Blue2

will be trying this sex one when I can find it

7991LXnSHO

wanna catch the space herp

Jaha95

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rbancy

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rbancy

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Jaha95

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rbancy

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351W stalls at traffic lights

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