Car stalls when it comes to a stop
#1516559
10/13/13 04:53 AM
10/13/13 04:53 AM
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Joined: Oct 2013
Posts: 18 Hawaii
bigboysurf58
OP
member
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OP
member
Joined: Oct 2013
Posts: 18
Hawaii
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I need some help with my 69 383 automatic A/C Road Runner. I am having trouble with the car stalling when it comes to a stop when warmed up. I have changed gas tank sender, line, fuel pump, filter, and new Edelbrock 1405, choke deleted because of warm climate. I found that the timming chain had a 10 degree stretch, so I replaced it and at the same time installed an Edelbrock Performer intake and aluminum water pump, recored the radiator. I found that the vaccum advance was inoperable on the points distibutor, so decided on a Pertronix Billet distributor and flame Thrower 3 coil, new wires, 65 amp alternator, an electronic voltage regulator, but run it through the ballast resister, because it runs really bad if I don't. When the car is warming up it runs good, but as it gets warm it starts to stall when slowing down or stopped, amp meter drops negative. when I load it with lights and A/C it gets worse. After it stalls it fires no problem, but starts to stall when I put it in gear. I switched out the Pertronix with a good points ditributor, but same thing. Timming is at 12 btdc at 750rpm. It seems to be elctical but not sure where to start. I know all my grounds are good......hope someone can help shed some light on my problem.....thanks.
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Re: Car stalls when it comes to a stop
[Re: bigboysurf58]
#1516560
10/13/13 05:01 AM
10/13/13 05:01 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Take out the idle mixture screws & afix one of those thin red straws that come on a WD40 can to a can of Brake Kleen & shoot a 2 second blast into each port. Count the # of turns in to lightly seated so you can easily return the screws to their original position. Might have a vac leak. E10 (ethanol) will make it want to stall when hot
live every 24 hour block of time like it's your last day on earth
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Re: Car stalls when it comes to a stop
[Re: bigboysurf58]
#1516562
10/13/13 05:28 AM
10/13/13 05:28 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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You're way ahead of me! Holler what it ends up being. Got another coil on hand you could sub in for a quick test? But it kinda sounds like fuel
live every 24 hour block of time like it's your last day on earth
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Re: Car stalls when it comes to a stop
[Re: bigboysurf58]
#1516564
10/13/13 09:47 AM
10/13/13 09:47 AM
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Joined: Jun 2003
Posts: 3,325 Truckville, the capital of NY
85_Ram_4speed
master
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master
Joined: Jun 2003
Posts: 3,325
Truckville, the capital of NY
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How many turns in does it take to lightly seat the idle mixture screws?
I find Edlebrocks tend to like the idle mixture screws around a 1-1.5 turns out from lightly seated.
And to that, how big is the cam in the engine, because it's possible it may need more RPM than 750 for idleing. 750 RPM at neutral idleing may not be enough for when it goes into drive. Do you know the in gear idle RPM?
Also a super tight converter on a biger cam will really drop the RPM in drive and make it very hard to drive around the idle range---for example a small block with a stock stall 904 converter fighting against a mopar 292 / 509 purpleshaft cam. This an example of one I worked on for someone else. The car was then speced for a 3600 stall converter by a well known company and all the other drivability issues disappeared.
Outcast Dodge guy.
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Re: Car stalls when it comes to a stop
[Re: bigboysurf58]
#1516568
10/14/13 09:49 PM
10/14/13 09:49 PM
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Joined: Jun 2003
Posts: 3,325 Truckville, the capital of NY
85_Ram_4speed
master
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master
Joined: Jun 2003
Posts: 3,325
Truckville, the capital of NY
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Anyway you can get a gauge on it to be sure?
I have a friend that races and has many times seen pumps NOT put out what they were supposed too---most were over spec. I have my Eddy's set at 5.5 psi for the moment until I can dial it in better. Sometimes you can go more, sometimes not, always best to be sure.
Outcast Dodge guy.
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Re: Car stalls when it comes to a stop
[Re: bigboysurf58]
#1516571
10/16/13 07:34 AM
10/16/13 07:34 AM
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Joined: Jun 2003
Posts: 3,325 Truckville, the capital of NY
85_Ram_4speed
master
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master
Joined: Jun 2003
Posts: 3,325
Truckville, the capital of NY
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You may have a case where when driving, it is calling for fuel and the needle and seat is open, but when you let off, and the needle and seat are most likely trying to close at or near that point, you mayy just have a hair to much pressure do to a spike in the fuel system and forcing fuel past the needle and seat, and then out the venturies thus momentarily flooding the car.
It would be nice if you could at least put a temporary regulator on it to lower the pressure just a little bit. If you had a holley on it, that pressure would be just fine.
Outcast Dodge guy.
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Re: Car stalls when it comes to a stop
[Re: 85_Ram_4speed]
#1516575
10/16/13 06:14 PM
10/16/13 06:14 PM
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Joined: Aug 2012
Posts: 1,574 Lakeland FL
floridian
pro stock
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pro stock
Joined: Aug 2012
Posts: 1,574
Lakeland FL
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Quote:
Quote:
First thing I would do is check the float levels in the carb
Great point!! If I were you, I would pull the floats off, and pull the needle and seats out and make sure they are clean, then reassemble and check float height. I have had recent problems with Eddy carbs related to dirty screens on the needle and seats and float levels that are off out of the box. One of my carbs had the float level set so low that there was barely any fuel getting to that bowl in the carb.
I was thinking too high and it floods out as you come to a stop..
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Re: Car stalls when it comes to a stop
[Re: floridian]
#1516577
10/17/13 07:37 AM
10/17/13 07:37 AM
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Joined: Jun 2003
Posts: 3,325 Truckville, the capital of NY
85_Ram_4speed
master
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master
Joined: Jun 2003
Posts: 3,325
Truckville, the capital of NY
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Quote:
Quote:
Quote:
First thing I would do is check the float levels in the carb
Great point!! If I were you, I would pull the floats off, and pull the needle and seats out and make sure they are clean, then reassemble and check float height. I have had recent problems with Eddy carbs related to dirty screens on the needle and seats and float levels that are off out of the box. One of my carbs had the float level set so low that there was barely any fuel getting to that bowl in the carb.
I was thinking too high and it floods out as you come to a stop..
You are right, I was just giving my example of what I found on my out of the box carbs that I was struggling with for a bit over the spring time.
But also, if it is not letting fuel in because it is too low, then you can get an issue there too. I have two carbs so i think one was covering up part of my issue from the other being off.
To the OP, glad it is better, keep tuning
Outcast Dodge guy.
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