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
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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: 36,040 Lincoln Nebraska
RapidRobert
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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: 36,040 Lincoln Nebraska
RapidRobert
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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
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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
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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
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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
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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
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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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Re: Car stalls when it comes to a stop
[Re: bigboysurf58]
#1516579
10/19/13 01:38 AM
10/19/13 01:38 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
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As far as you can tell it was rebuilt with a stock cam?. I'd think it should idle at less than 800 plus not stall when the initial is backed down to 15. Vac leak maybe? something still ain't right & I'm not sure if it is inside or outside the carb. Any possibility the cam phasing is off
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: RapidRobert]
#1516580
10/19/13 03:56 AM
10/19/13 03:56 AM
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Joined: Oct 2013
Posts: 18 Hawaii
bigboysurf58
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Motor was rebuilt back in 05. I contacted the shop, but they couldn't help me as they only kept records for 5 years. It sounds stock, nice rumble but no lope, just smooth idle. No aftermarket items except performer intake, and 1405 edelbrock carb, and Pertronix Flamethrower 3. I did change the timming chain (CompCams) as the old chain had stretched, installed straight up. The stalling problem was before the installation of these parts. Funny thing, when I first got the car it ran fine, a little sluggish, but it didn't stall, but it was running a points dist. with a vac, advance that didn't work. then it went downhill from there. It runs better with the Pertronix, but thats not saying much...checked for vaccum leaks after intake installed, but none found...
Last edited by bigboysurf58; 10/19/13 03:58 AM.
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Re: Car stalls when it comes to a stop
[Re: bigboysurf58]
#1516581
10/19/13 10:19 AM
10/19/13 10:19 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
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To clarify, at one time it ran OK (but a bit sluggish) then it deteriorated with no part changes? & after the part changes it ran a bit better but still had an issue? Were all of the part changes done at the same time (including the dist) & when it first went bad was it all of a sudden or gradually?
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: RapidRobert]
#1516582
10/19/13 10:27 AM
10/19/13 10:27 AM
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Joined: May 2007
Posts: 1,443 Maryland
Dads426
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Maryland
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Thy Edelbrock carbs are jetted fairly lean. Try going up 1-2 sizes larger on the primary jets and see if the stalling & hesitation go away.
Last edited by Dads426; 10/19/13 10:30 AM.
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Re: Car stalls when it comes to a stop
[Re: RapidRobert]
#1516583
10/19/13 12:52 PM
10/19/13 12:52 PM
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Joined: Oct 2013
Posts: 18 Hawaii
bigboysurf58
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It was a gradual deterioration. I replaced the carb,after replacing everything from the gas tank to the carb, then distributor,wires, plugs, then timming chain, and intake in that order.I was trying to eliminate problems and change suspect old parts. The Pertronix was put in place of the points distributor, that had a defective vac advance. Timming chain was replaced when I dicovered the timming was jumping back and forth. I decided to change the intake at the same time, since the front end was apart, and take a little weight off the front. I had thought at one time I might have internal issues, possible burnt valves or sticky valves, not sure. It has been about 25 yrs since my last Mopar (681/2 Super Bee) but man this car has me stumped....I like to tinker but this is really driving me crazy because the car is top shape otherwise.....case of the beautiful car that doesn't run well, and hard to get help here cause Hawaii is 90% Chevy muscle which is fine, I traded my 69 427 Vette for this car. I know it will get resolved, thanks to everybody for their advice.
Last edited by bigboysurf58; 10/19/13 01:35 PM.
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Re: Car stalls when it comes to a stop
[Re: bigboysurf58]
#1516584
10/19/13 02:41 PM
10/19/13 02:41 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
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I keep thinking vac leak & most of the time the valley pans seal well & sometimes they dont. I'd take the clusters out & blast the brass tubes with the holes along the length of the tubes etc with brake kleen and also the recess where the clusters sit plus blast the idle mix screw ports on the chance that it is the carb idle circuit. Might block the metering rods up so you are on the power circuit (tho I ain't sure how much the power circuit is working at idle on eddies) and open up the idle mix screws all in an attempt to richen it & compensate for a vac leak if that is indeed the issue & take it out for a spin & see how it acts. We gotta get this before you trade back for the vette
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: dezduster]
#1516589
10/23/13 03:59 AM
10/23/13 03:59 AM
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Joined: Oct 2013
Posts: 18 Hawaii
bigboysurf58
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Changed jets today, 104 from 100, same rods, about two steps richer. let engine warm up, set timming to 13 btdc 750 rpm. Blip throttle a few times to 3000rpm, seemed ok, turn a/c on blip throttle again, as rpms drop goes negative 750rpm, down to almost stalling then comes back up to 750. Blip again, rpms drop to stall. Start up again same procedure, rpms drop, and again almost stall engine, but goes back to 750. As rpms drop close to stalling, amp meter reads negative. Rpm drops to 680-670 in drive and reverse. When a/c is off, tendency of stalling seems to be less, but as car runs longer, tendecy to stall goes up, a/c on or off.
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Re: Car stalls when it comes to a stop
[Re: bigboysurf58]
#1516591
01/09/14 03:53 AM
01/09/14 03:53 AM
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Joined: Oct 2013
Posts: 18 Hawaii
bigboysurf58
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To all who helped me with suggestions up to October 28, I kept working on the car, and what I finally figured out was that the gas I was using, 10% ethanol mix, was giving me the stalling problems. I couldn't believe that made all the difference. I did change the carb to a Edel 650 AVS, from a 1405, and I went back to my original points set up, but I have to say the RR purrs now.....so, it was the ethanol fuel blend that made the car run like crap. Thanks for all the help....
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