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Car stalls under rapid braking #71746 06/11/08 10:53 PM 06/11/08 10:53 PM
Joined: Mar 2008 Posts: 571 Western NC 68Bullit OP mopar
68Bullit OP mopar Joined: Mar 2008 Posts: 571 Western NC	Hello all. My 68 Charger has been stalling when I brake suddenly at lower speeds (i.e., when pulling up to a red light or stop sign). If I slow down gradually everything is fine but if someone slows down in front of me really fast, for example or if I need to slow quickly at lower speeds (not squealing the tires or anything), but hard enough on the brakes, then the car starts to stall. If I don't put it in neutral and pick up the throttle to help it idle, then it begins to stall. I've checked the float levels in the carb and that's all good. Transmission is 904 auto with forward manual pattern. Front brakes have been converted to Mopar disc brakes. Anybody help with this?

Re: Car stalls under rapid braking [Re: 68Bullit] #71747 06/11/08 11:14 PM 06/11/08 11:14 PM
Joined: Oct 2005 Posts: 797 arizona, usa L lokalik super stock
lokalik super stock L Joined: Oct 2005 Posts: 797 arizona, usa	do you have a(vacuum) power booster. if so the sudden braking could be stalling the motor, lack of vacuum, being robbed by the booster.

Re: Car stalls under rapid braking [Re: lokalik] #71748 06/11/08 11:26 PM 06/11/08 11:26 PM
Joined: Jan 2003 Posts: 29,650 Hamtramck, PA A Alaskan_TA Fluffy Balladeer
Alaskan_TA Fluffy Balladeer A Joined: Jan 2003 Posts: 29,650 Hamtramck, PA	I had the same problem with a 273 in a '67 Barracuda. The engine seized shortly thereafter. In my case,the thrust bearing had gone away, when I came to a stop the crankshaft was actually sliding forward inside the engine. The CS counterweight had ground away about 1/4" of the center main web in the block before the engine seized. Hopefully your problem is not as severe.

Re: Car stalls under rapid braking [Re: lokalik] #71749 06/11/08 11:41 PM 06/11/08 11:41 PM
Joined: Mar 2008 Posts: 571 Western NC 68Bullit OP mopar
68Bullit OP mopar Joined: Mar 2008 Posts: 571 Western NC	Yes I have power brakes. So what's happening with the vacuum? Anything I could do to increase vacuum?

Re: Car stalls under rapid braking [Re: 68Bullit] #71750 06/11/08 11:55 PM 06/11/08 11:55 PM
Joined: Oct 2005 Posts: 797 arizona, usa L lokalik super stock
lokalik super stock L Joined: Oct 2005 Posts: 797 arizona, usa	the booster could be making the engine starve down by pulling all or most of the vacuum durning sudden braking. do you know what your manifold vac is? try this disconnect the vac line for the booster, cap the port on your manifold. try the same braking that was causing it to stall, please do this in a safe area. this will answer the question of, is the booster causing this. only way i know of to increas vac is to change the cam. some have suggested a vac canister, i don't know.

Re: Car stalls under rapid braking [Re: 68Bullit] #71751 06/12/08 08:14 AM 06/12/08 08:14 AM
Joined: Aug 2003 Posts: 3,896 St. Louis, MO Blues_Cuda master
Blues_Cuda master Joined: Aug 2003 Posts: 3,896 St. Louis, MO	Are you running a Carter / Edelbrock carb?

Re: Car stalls under rapid braking [Re: Blues_Cuda] #71752 06/12/08 08:58 AM 06/12/08 08:58 AM
Joined: Apr 2007 Posts: 1,261 ILL mark7171 pro stock
mark7171 pro stock Joined: Apr 2007 Posts: 1,261 ILL	fuel slosh could uncover the jet. they sell extension to solve that.

Re: Car stalls under rapid braking [Re: Blues_Cuda] #71753 06/12/08 11:00 AM 06/12/08 11:00 AM
Joined: Mar 2008 Posts: 571 Western NC 68Bullit OP mopar
68Bullit OP mopar Joined: Mar 2008 Posts: 571 Western NC	Quote: Are you running a Carter / Edelbrock carb? Holley #4150 650DP

Re: Car stalls under rapid braking [Re: 68Bullit] #71754 06/12/08 11:33 AM 06/12/08 11:33 AM
Joined: Feb 2004 Posts: 3,076 Renton, Wa. C Classof70Chally super gas
Classof70Chally super gas C Joined: Feb 2004 Posts: 3,076 Renton, Wa.	My six packs did the same thing, especially on a downhill slope. I put the plastic tube jet extensions on the center carb and the problem went away.

Re: Car stalls under rapid braking [Re: Classof70Chally] #71755 06/12/08 02:19 PM 06/12/08 02:19 PM
Joined: Jan 2003 Posts: 2,931 P Paul_Fancsali master
Paul_Fancsali master P Joined: Jan 2003 Posts: 2,931	A carter carb will do this and the only solution to it is the float height and even then on a hot day it will still do it

Re: Car stalls under rapid braking [Re: 68Bullit] #71756 06/12/08 06:18 PM 06/12/08 06:18 PM
Joined: Aug 2003 Posts: 3,896 St. Louis, MO Blues_Cuda master
Blues_Cuda master Joined: Aug 2003 Posts: 3,896 St. Louis, MO	Quote: Quote: Are you running a Carter / Edelbrock carb? Holley #4150 650DP OK. The reason I asked is that the AFB style carbs tend to act like that. Our Max Wedge Savoy does the same thing on the street during aggressive braking and even on the shorter shutdown areas at the mom & pop racetracks. As mentioned above, try the jet extensions and maybe a vent tube baffle on the Holley.

Re: Car stalls under rapid braking [Re: Blues_Cuda] #71757 06/12/08 06:43 PM 06/12/08 06:43 PM
Joined: Jan 2003 Posts: 3,680 South San Francisco, Ca 70sixpkrt master
70sixpkrt master Joined: Jan 2003 Posts: 3,680 South San Francisco, Ca	Quote: I put the plastic tube jet extensions on the center carb Do you have a pic of those things? [img]http://www.imgur.com/hxlGUJt.gif[/img] 4-speed 3:54 Dana 13.01 @107.93 with street tires (not hooking up)

Re: Car stalls under rapid braking [Re: 70sixpkrt] #71758 06/12/08 07:09 PM 06/12/08 07:09 PM
Joined: Feb 2004 Posts: 3,076 Renton, Wa. C Classof70Chally super gas
Classof70Chally super gas C Joined: Feb 2004 Posts: 3,076 Renton, Wa.	No, sorry, I'm not smart enough to post a pic here. Get into the Summit or Jegs web site and type in carb jet extenders, etc. The ones I got came as three pairs, each pair slightly different length. They push over the outside of the jet screw but you may have to warm them a bit with a lamp, etc because they are very tight.

Re: Car stalls under rapid braking [Re: Paul_Fancsali] #71759 06/12/08 09:11 PM 06/12/08 09:11 PM
Joined: Jul 2003 Posts: 6,167 Maryland GO_Fish master
GO_Fish master Joined: Jul 2003 Posts: 6,167 Maryland	my guess was going to be float level too high, flooding the engine. How does it act on restart? Does it light off instantly, or do you have to crank it a little to catch? Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph

Re: Car stalls under rapid braking [Re: GO_Fish] #71760 06/12/08 11:01 PM 06/12/08 11:01 PM
Joined: Mar 2008 Posts: 571 Western NC 68Bullit OP mopar
68Bullit OP mopar Joined: Mar 2008 Posts: 571 Western NC	Most of the time I catch it in time and keep it from stalling but when I rarely miss it and it stalls, it can take a bit of starting before it will hit again. Float levels are good. I have also noticed that going a down a steep hill and while off the throttle that it seems to start running a little rough but the speed/rpm is up enough to keep it from stalling. I'll try the extension, and would it be a good idea to go ahead with a wooden spacer under the carb just for good measure and with the warmer weather?

Re: Car stalls under rapid braking [Re: Classof70Chally] #71761 06/13/08 08:26 AM 06/13/08 08:26 AM
Joined: Jan 2003 Posts: 2,836 Detroit boy in Saugerties, NY BrianShaughnessy master
BrianShaughnessy master Joined: Jan 2003 Posts: 2,836 Detroit boy in Saugerties, NY	Quote: No, sorry, I'm not smart enough to post a pic here. Get into the Summit or Jegs web site and type in carb jet extenders, etc. The ones I got came as three pairs, each pair slightly different length. They push over the outside of the jet screw but you may have to warm them a bit with a lamp, etc because they are very tight. Moroso 65227? http://store.summitracing.com/partdetail.asp?part=MOR%2D65227&view=1&N=700+ Black Betty: '69 Charger RT: 440 6 pack, TKO600 5 speed, 3.73 Dana. Sinnamon: '69 Charger RT: 440, 727, 4.30 8.75. High School Sweetheart. El Grande: '98 Grand Cherokee 5.9 Limited.

Re: Car stalls under rapid braking [Re: 68Bullit] #71762 06/15/08 12:50 AM 06/15/08 12:50 AM
Joined: Jul 2003 Posts: 6,167 Maryland GO_Fish master
GO_Fish master Joined: Jul 2003 Posts: 6,167 Maryland	Quote: Most of the time I catch it in time and keep it from stalling but when I rarely miss it and it stalls, it can take a bit of starting before it will hit again. Float levels are good. I have also noticed that going a down a steep hill and while off the throttle that it seems to start running a little rough but the speed/rpm is up enough to keep it from stalling. I'll try the extension, and would it be a good idea to go ahead with a wooden spacer under the carb just for good measure and with the warmer weather? Carter and Eddy carbs definitely need a spacer beneath the carb to ease hot starts. Their fuel bowl is integral with the carb body and likes to soak up heat from the intake manifold. Not so much on Holley's since the carb bowls are hanging out in the open air away from direct intake manifold heat. If you have to crank it a bit before it re-fires, it sounds like the engine is flooding/rich. Scott B. "I'm a self-made man... I started with nothing, and I still have most of it!" 68 360 rusty B'cuda 'vert (GO Fish)13.59@ 98.72 mph 69 340 GTS stock 14.18@ 95.60 mph 01 5.9L Ram 1500 Quad Cab 4x4 01 3.5L 300M 16.23@ 86.97 mph

Re: Car stalls under rapid braking [Re: GO_Fish] #71763 06/15/08 01:34 AM 06/15/08 01:34 AM
A Anonymous Unregistered
Anonymous Unregistered A	Quote: my guess was going to be float level too high, flooding the engine. How does it act on restart? Does it light off instantly, or do you have to crank it a little to catch? most likely to low (front bowl) and its uncovering the jets. whoever said put jet extentions on the front bowl of any holley is .

Re: Car stalls under rapid braking #71764 06/15/08 01:51 AM 06/15/08 01:51 AM
Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O 70Cuda383 Too Many Posts
70Cuda383 Too Many Posts Joined: Oct 2003 Posts: 21,345 Marysville, O-H-I-O	Quote: Quote: my guess was going to be float level too high, flooding the engine. How does it act on restart? Does it light off instantly, or do you have to crank it a little to catch? most likely to low (front bowl) and its uncovering the jets. whoever said put jet extentions on the front bowl of any holley is . Holley says they might be needed if it happens under hard acceleration where the fuel is pulled away from the jets...why is it crazy to have to put them up front if it happens under hard braking? although, my Holley 4150 (750HP) does not have them and I don't have any problems. maybe I don't have enough power to accelerate fast enough, or enough brakes to stop hard enough that I need the extensions? Photobucket sucks

Re: Car stalls under rapid braking [Re: 70Cuda383] #71765 06/15/08 12:20 PM 06/15/08 12:20 PM
Joined: Feb 2004 Posts: 3,076 Renton, Wa. C Classof70Chally super gas
Classof70Chally super gas C Joined: Feb 2004 Posts: 3,076 Renton, Wa.	On a six pack the only time the jets can become uncovered is under hard braking, especially going down hill (for those of us who have hills). No one can tell me it doesn't happen because after putting jet extenders on my center carb the problem "magically" disappeared.

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