engine hesitates iniatially ......
#62217
05/23/08 04:58 PM
05/23/08 04:58 PM
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Joined: Oct 2004
Posts: 476 NJ
Nvr4Get911
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car ...'66 Barracuda Form. S engine ... 273 commando..port/polished heads dual H-pipe exhaust 4.10 rear - 26" tire height edelbrock dual plane intake holley 600 double pumper model 4150/4160??? (no mods) Lunati cam .515 /.525 PROBLEM - when revving the engine idling it has an initial hesitation. Even if I bring the rpms up to 2000rpms and rev it from there it still has a brief hesitation. I've been running this setup for about 4000miles Also new gas tank.....carb and fuel lines were airred out. I also noticed today that the right exhaust tip is emitting warm/hot exhaust and the left side was emitting hot fumes. Let the replies roll fellas.. 273HYPO
Last edited by 273HYPO; 05/23/08 05:31 PM.
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Re: engine hesitates iniatially ......
[Re: Viol8r]
#62220
05/23/08 05:40 PM
05/23/08 05:40 PM
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Joined: Oct 2004
Posts: 476 NJ
Nvr4Get911
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It's a stock Holley 600cfm double pumper w/ a manual choke. I tried looking online to find out the jet sizes, squirters etc.. but couldn't find it. I even checked Holleys website. Any tips on how I can tell or find out?
Last edited by 273HYPO; 05/23/08 05:41 PM.
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Re: engine hesitates iniatially ......
[Re: Nvr4Get911]
#62221
05/23/08 06:14 PM
05/23/08 06:14 PM
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Joined: Jan 2007
Posts: 780 Woodinville, WA
Viol8r
super stock
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super stock
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I would suggest getting friendly with it and looking at what is exactly on your carb. Who knows what has been changed. http://www.mopar1.us/carbs.htmlMake sure that choke is all the way open. There is a good possibilty you need to simply up the jets at least 2 sizes front and rear. Try that and report back.
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Re: engine hesitates iniatially ......
[Re: Ronnman]
#62223
05/24/08 07:34 AM
05/24/08 07:34 AM
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Nvr4Get911
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Quote:
Look on the drivers side for numbers on the choke horn. See attached pic to get the idea. Ron
Okay, here are the numbers I found on the choke horn ..477B-7 , underneath that number was 2151, front bowl has 11169 on top and 11398 on the rear bowl, base plate under throttle linkage is 11082, and I also found the number 6R-5534B. Does this help? Can you decipher any of this?
Thx, 273HYPO
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Re: engine hesitates iniatially ......
[Re: Nvr4Get911]
#62224
05/24/08 07:52 AM
05/24/08 07:52 AM
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Joined: Jan 2003
Posts: 5,443 Indiana
YO7_A66
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""Okay, here are the numbers I found on the choke horn ..477B-7""
I think that your number may be 4778-7. If so than this is what I found: 4150 style, 700cfm, 69/78 jets, 6.5pv, .028 squirter.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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Re: engine hesitates iniatially ......
[Re: FurryStump]
#62227
05/24/08 08:48 AM
05/24/08 08:48 AM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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when you start to move the throttle do you get an immediate stream of gas from the accel pump? & you might take out your sight plugs & check fuel level. What do your plugs look like?
live every 24 hour block of time like it's your last day on earth
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Re: engine hesitates iniatially ......
[Re: BSB67]
#62230
05/24/08 11:03 AM
05/24/08 11:03 AM
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Joined: Jan 2005
Posts: 1,647 IL
71383beep
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top fuel
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What do you mean by hesitation? Does the motor stall? Is this in gear from a stop? Do you mean the car stalls and then accelerates from a stop?
Is this an automatic and if so what size is the torque coverter?
'73 GK6 Challenger Rallye - 340 4-Speed
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Re: engine hesitates iniatially ......
[Re: 71383beep]
#62231
05/24/08 04:57 PM
05/24/08 04:57 PM
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Joined: Oct 2004
Posts: 476 NJ
Nvr4Get911
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Ok, I double checked my carb numbers and it is #4776-B = Holley 600cfm, mechanical secondaries & manual choke. Can someone give me the jet size, power valve, squirter and any other tech info. I couldn't find it on Holley's website. It is a 4 speed and the motor does not stall. When idling I'll rev the motor and does not instantaneously react to me depressing the gas pedal. It hesitates or delays for split second then revs correctly. It doesn't matter if I'm idling @ 800rpms or holding the revs @ 2500rpms and then depress the gas pedal to the floor. When I'm driving and mashing the pedal from a cruising speed this delay/hesitation doesn't occur. Float levels are fine... 273HYPO
Last edited by 273HYPO; 05/24/08 04:58 PM.
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Re: engine hesitates iniatially ......
[Re: Nvr4Get911]
#62234
05/25/08 10:53 AM
05/25/08 10:53 AM
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Joined: Jul 2005
Posts: 1,472 Overland Park, KS.
Joshs68
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pro stock
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Overland Park, KS.
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start with the basic stuff, check the float bowl level. adjust the idle mix screws for the highest vaccum. start at 1 1/2 turns out from bottom. see how much vaccum you can get. my quess is you will need a lower number power valve. and a little tweaking
Last edited by Joshs68; 05/25/08 10:54 AM.
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Re: engine hesitates iniatially ......
[Re: Nvr4Get911]
#62236
05/25/08 10:08 PM
05/25/08 10:08 PM
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Posts: 5,443 Indiana
YO7_A66
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""If I adjust the idle mix screws what vacuum number am I trying to achieve?""
You are trying to achieve the highest vacuum reading at the N (since you have a 4 speed)rpm that you desire. If you want it to idle at 950rpms, than you adjust your mixture screws to get the highest vacuum at that rpm. As you get closer to the best vacuum number, your idle will increase, so you lower it back down and keep adjusting. Before you start the engine, count how many turns out each one of your mixture screws are set at. Then set them both to the same setting and hook up a vacuum gage so you can see it from the engine area. Then once the engine is warmed up and the choke full open, then turn one of the screws in or out (your choice) 1/4 turn and watch what the gage does. If the gage goes up then you know you are going in the right direction, if it goes down, then turn it back 1/4 turn to where you started and then go 1/4 turn the opposite direction. Once you know which direction you need to turn the screws, then wait 30 seconds or so before making another adjustment. Go to the other screw and do the same adjustment. You have to keep going back and fourth until you get the best vacuum reading and keep readjusting the idle rpms back down as needed. As you are adjusting each side, you will get to a point where you can only adjust each screw by 1/8 of a turn or so to keep the highest reading, then you may need to adjust them even less to maybe a 1/16 of a turn to get the best vacuum at your idle rpms. Don't be afraid to take your time and do this back and fourth for a while. Once you take the time to do it right, then you should have your highest reading and maybe a steady vacuum reading pending on your setup. Then you figure out what power valve to run by dividing this number in half to start with.
1970 YO7 A66 [Canadian Export] F8 Challenger 340 (Currently in shop for stroker assy.)
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