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Car stalls on hard braking #31402
10/03/06 12:39 AM
10/03/06 12:39 AM
Joined: Jan 2004
Posts: 4,150
VA
RapidRunner Offline OP
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RapidRunner  Offline OP
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VA
I was executing a hard braking exercise in traffic the other day not by my choice.

During the braking as I pressed harder on the pedal to quickly stop the car the engine idle continued to drop until it finally stalled out. No problem restarting it though.

I checked the float level on teh center carb when I got home and it was right at the bottom of the sight hole just slightly dribbling out.

Any suggestions?

MikeE


Who knows? The Shadow Knows! But he ain't on this fraking forum! "This restoration is a test,, It is ONLY a test, Had this been an actual Restoration I would have received instructions on what to do and where to get the MONEY!" -------------------------------
Re: Car stalls on hard braking [Re: RapidRunner] #31403
10/03/06 01:25 AM
10/03/06 01:25 AM
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440 Offline
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Quicksilver440  Offline
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Central Valley, CA.
I had a similar problem...here's my post...maybe it will help you. I havn't had mine out yet again to test mine....

https://board.moparts.org/ubbthreads/show...&PHPSESSID=

Re: Car stalls on hard braking [Re: Quicksilver440] #31404
10/03/06 02:33 PM
10/03/06 02:33 PM
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VA
RapidRunner Offline OP
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rvoyles,

Thanks for the reply.

First let me say that your cars looks awesome. I love the look of the silver and black

I do not think I have a flooding problem. If I start to brake hard the idle will start to drop smoothly(almost linearly) below 900 like you are turning the idle screw down. If you let off the brake the idle comes back up. If you press harder on the pedal the idle continues to slowly, smoothly drop to 0 and the cars stalls.

Once it stalls you can start it right back up like normal, just turn the key, no need to playing with the throttle.

I'm not saying it can't be a flooding problem just one I am not fimilar with. I would have expected a hard start if it flooded.

Manual steering and manual brakes if that helps??

MikeE


Who knows? The Shadow Knows! But he ain't on this fraking forum! "This restoration is a test,, It is ONLY a test, Had this been an actual Restoration I would have received instructions on what to do and where to get the MONEY!" -------------------------------
Re: Car stalls on hard braking [Re: RapidRunner] #31405
10/03/06 03:35 PM
10/03/06 03:35 PM
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Posts: 3,103
Phila Pa
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scatpacktom Offline
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Phila Pa
I agree,float levels

Re: Car stalls on hard braking [Re: RapidRunner] #31406
10/03/06 03:47 PM
10/03/06 03:47 PM
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Posts: 21,474
N.E. OHIO, USA
A12 Offline
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Does it do that in reverse too?

MikeR

Re: Car stalls on hard braking [Re: RapidRunner] #31407
10/03/06 03:54 PM
10/03/06 03:54 PM
Joined: Jan 2003
Posts: 21,474
N.E. OHIO, USA
A12 Offline
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N.E. OHIO, USA
Float valve.

Float pivot.

Float with pin hole.

Float vent.

Take that carb and get your money back from the you got it from


MikeR

Re: Car stalls on hard braking [Re: A12] #31408
10/03/06 03:56 PM
10/03/06 03:56 PM
Joined: Dec 2003
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West Coast, CA
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Troy Offline
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Quote:

Does it do that in reverse too?

MikeR




Remember your brakes only work about a third as well going in reverse as they do going forward so WATCH OUT!!


....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!
Re: Car stalls on hard braking [Re: RapidRunner] #31409
10/03/06 03:56 PM
10/03/06 03:56 PM
Joined: Aug 2003
Posts: 414
eastern PA
6
6365Abody Offline
mopar
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eastern PA
I had a thought. My first thought was carb floats, and it still may be something wrong with them. But after you said braking, esp when you brake hard, I think you may have a vacuum leak in your braking system, that is, if you have power brakes. I think it maybe a problem with both the brakes and the floats. Try different things with the brakes, such as breaking with the vacuum line pinched off and see if the engine still dies.

Re: Car stalls on hard braking [Re: 6365Abody] #31410
10/03/06 07:25 PM
10/03/06 07:25 PM
Joined: Oct 2004
Posts: 731
NY
X
XXHEMI Offline
super stock
XXHEMI  Offline
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NY
Rapid

Try adjusting the air mixture screws on the out board carbs. I know it don't sound right but I had the same problem with a new set of Holley's right out of the box. Tried everything until that fixed it.

Re: Car stalls on hard braking [Re: RapidRunner] #31411
10/03/06 07:41 PM
10/03/06 07:41 PM
Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quicksilver440 Offline
I Live Here
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I Live Here

Joined: Jan 2003
Posts: 10,766
Central Valley, CA.
Quote:

rvoyles,

Thanks for the reply.

First let me say that your cars looks awesome. I love the look of the silver and black

I do not think I have a flooding problem. If I start to brake hard the idle will start to drop smoothly(almost linearly) below 900 like you are turning the idle screw down. If you let off the brake the idle comes back up. If you press harder on the pedal the idle continues to slowly, smoothly drop to 0 and the cars stalls.

Once it stalls you can start it right back up like normal, just turn the key, no need to playing with the throttle.

I'm not saying it can't be a flooding problem just one I am not fimilar with. I would have expected a hard start if it flooded.

Manual steering and manual brakes if that helps??

MikeE




Thanks for the kind words...

I agree that the engine restarting so easily doesn't really sound like a flooding issue. Mine was always hard to restart....but only occured under real hard breaking.

Just a though...whats your idle sitting at in gear? Could you have it so low that any flutter in the carb is causing a stall? Maybe try raising the in gear idle a touch....just and idea.

Re: Car stalls on hard braking [Re: RapidRunner] #31412
10/03/06 09:24 PM
10/03/06 09:24 PM
Joined: Jan 2003
Posts: 21,474
N.E. OHIO, USA
A12 Offline
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Okay MikeE, here's a reach....a bad idle solenoid, brake lights come on and solenoid steps back a little...............come on I'm really reaching here

turn the idle up way higher than normal, I would think if it's a carb float issue it would still stall with a very high idle


Does it stall with the trans in neutral and you get on the brakes hard?

Re: Car stalls on hard braking [Re: A12] #31413
10/04/06 12:04 AM
10/04/06 12:04 AM
Joined: Jan 2004
Posts: 4,150
VA
RapidRunner Offline OP
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VA
Quote:

Float valve.

Float pivot.

Float with pin hole.

Float vent.

Take that carb and get your money back from the you got it from


MikeR




I thought about logging a complaint, but the bowl and float are mine from my center carb. remember

The float checked out okay when I had the carb apart so i do not think there is a hole in it.

Funny thing is mikeR I was talking to my dad tonight and he mentioned the idle solenoid also. My only thought on that is that it would do it all the time when you pressed the brake, unles the short only happens when the front end is dipping down.

Yes I tried the hard braking after putting the car in neutral and it does the same thing.

I cannot say I tested when the car was cold becuase I just noticed this weekend when I did the hard stop on teh highway. After it did it once I did some testing on the way home like braking hard in neutral, start braking hard and then letting off the brake. Brake slow and then about 5mph hour stop hard (this time the RPM dropped but recovered)


MikeE

Last edited by RapidRunner; 10/04/06 12:08 AM.

Who knows? The Shadow Knows! But he ain't on this fraking forum! "This restoration is a test,, It is ONLY a test, Had this been an actual Restoration I would have received instructions on what to do and where to get the MONEY!" -------------------------------
Re: Car stalls on hard braking [Re: A12] #31414
10/04/06 12:09 AM
10/04/06 12:09 AM
Joined: Jan 2004
Posts: 4,150
VA
RapidRunner Offline OP
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Quote:

Does it do that in reverse too?

MikeR





Never tried. Might try this weekend if the weather is nice.

MikeE


Who knows? The Shadow Knows! But he ain't on this fraking forum! "This restoration is a test,, It is ONLY a test, Had this been an actual Restoration I would have received instructions on what to do and where to get the MONEY!" -------------------------------
Re: Car stalls on hard braking [Re: 6365Abody] #31415
10/04/06 12:10 AM
10/04/06 12:10 AM
Joined: Jan 2004
Posts: 4,150
VA
RapidRunner Offline OP
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Quote:

I had a thought. My first thought was carb floats, and it still may be something wrong with them. But after you said braking, esp when you brake hard, I think you may have a vacuum leak in your braking system, that is, if you have power brakes. I think it maybe a problem with both the brakes and the floats. Try different things with the brakes, such as breaking with the vacuum line pinched off and see if the engine still dies.




Manual Brakes, Manual steering and a 4-speed.

Only vacuum connection is a vacumm guage.

MikeE


Who knows? The Shadow Knows! But he ain't on this fraking forum! "This restoration is a test,, It is ONLY a test, Had this been an actual Restoration I would have received instructions on what to do and where to get the MONEY!" -------------------------------
Re: Car stalls on hard braking [Re: XXHEMI] #31416
10/04/06 12:16 AM
10/04/06 12:16 AM
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VA
RapidRunner Offline OP
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Quote:

Rapid

Try adjusting the air mixture screws on the out board carbs. I know it don't sound right but I had the same problem with a new set of Holley's right out of the box. Tried everything until that fixed it.




XXHEMI,

Interesting. Never would have thought that. THey do need adjusted, I know this because they effect teh idle too much. (menaing if I cover teh airbleeds on teh outer carbs the idle drops on teh motor)

This unfortunately will be a longer time off before I get the time to mess with the carbs completely.

MikeE


Who knows? The Shadow Knows! But he ain't on this fraking forum! "This restoration is a test,, It is ONLY a test, Had this been an actual Restoration I would have received instructions on what to do and where to get the MONEY!" -------------------------------
Re: Car stalls on hard braking [Re: RapidRunner] #31417
10/04/06 12:35 AM
10/04/06 12:35 AM
Joined: Jan 2003
Posts: 29,648
Hamtramck, PA
Alaskan_TA Offline
Fluffy Balladeer
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Posts: 29,648
Hamtramck, PA
I had a similar problem a couple yars ago. It ended up being the thrust bearing, it failed and on hard stops the crank shaft was actually sliding forward in the mains. When the middle counterweight contacted the main web of the engine block the engine would stall. It always restarted except for the last time....

When I tore it apart I found out that the crank shaft had eaten away about 1/4" of the material in the main web. I had to toss the engine it was so far gone.

For your sake I hope it is a fuel issue.

Barry

Re: Car stalls on hard braking [Re: Alaskan_TA] #31418
10/04/06 12:58 AM
10/04/06 12:58 AM
Joined: Jan 2004
Posts: 4,150
VA
RapidRunner Offline OP
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VA
Man, Don't scare me like this.

Is there any way to check for that short of dropping the oil pan?

The motor is all new and clearences checked on assembly. I know that won't stop a defective bearing prblems but it should help revent a good one turnign bad...

MikeE


Who knows? The Shadow Knows! But he ain't on this fraking forum! "This restoration is a test,, It is ONLY a test, Had this been an actual Restoration I would have received instructions on what to do and where to get the MONEY!" -------------------------------
Re: Car stalls on hard braking [Re: RapidRunner] #31419
10/04/06 08:23 AM
10/04/06 08:23 AM
Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn Offline
master
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Blair County,PA
Mike,you know that your engine is a big vacuum pump.Disconnect the vacuum advance on your distributor and see what happens.

Re: Car stalls on hard braking [Re: RapidRunner] #31420
10/04/06 12:35 PM
10/04/06 12:35 PM
Joined: Apr 2005
Posts: 279
pgh pa
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captaindodge Offline
enthusiast
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Posts: 279
pgh pa
I have same problem with my AVS 4bbl on 440 Charger, but it will also stall on hard left turns but hard right turns are no problem. (this is with foot off gas pedal). Setting float level low seems to help but no solve the problem.

Re: Car stalls on hard braking [Re: captaindodge] #31421
10/04/06 01:41 PM
10/04/06 01:41 PM
Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn Offline
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62maxwgn  Offline
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Blair County,PA
Quote:

I have same problem with my AVS 4bbl on 440 Charger, but it will also stall on hard left turns but hard right turns are no problem. (this is with foot off gas pedal). Setting float level low seems to help but no solve the problem.




There is a fix for that in the old Tech Bullitens.If I can find it I'll post it.

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