Barracuda Challenger Forum

Author Topic: Holley Carb Dies When Foot on the Gas....  (Read 1109 times)

Offline 72and86

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Holley Carb Dies When Foot on the Gas....
« on: April 10, 2017 - 10:48:14 AM »
My newly purchased '73 has a Holley 670 Street Avenger on it. When I put my foot on the gas to go from a stop the car really hesitates before it goes. If I want to go from a stop or low rpm I have to really go easy on it.

Today I put my foot on the gas and I could feel the car choking and it stalled. Now...had I let off the gas it would have "recovered" and I would have been fine.

PO says carb has been rebuilt recently.

Any suggestions? I really don't know a lot about carbs so go slow...
heres the carb specs: https://www.holley.com/products/fuel_systems/carburetors/avenger/street_avenger/parts/0-80670
Thanks Steve




Offline mopar jack

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #1 on: April 10, 2017 - 11:07:54 AM »
I would check the accelerator pump. Take off the air cleaner with engine off you can just nudge the throttle and check to see if gas is squirting from the nozzles. There should be no delay or slack in the accelerator linkage.

Offline DocMel

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #2 on: April 10, 2017 - 02:15:43 PM »
"PO said it was just rebuilt"   Who knows what quality of work was done, but checking the accel pump as said would be my first look


Offline EMCD

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #3 on: April 10, 2017 - 02:57:56 PM »
I had the same issue and it was the accelerator pump.

Offline xtopfuel

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #4 on: April 10, 2017 - 06:45:51 PM »
I agree accelerator pump but could be the cam on linkage that allows adjustment on accel pump

Offline 734406pk

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #5 on: April 10, 2017 - 11:25:44 PM »
I agree accelerator pump but could be the cam on linkage that allows adjustment on accel pump

 :iagree: Here is a youtube video from Holley that shows how to adjust the accelerator pump. The Street Avenger 670 may have been rebuilt but never adjusted on engine (dialed in). What engine CID do you have BTW 318? 340?

https://www.youtube.com/watch?v=k-Nx5HEzvlY
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive

Offline 72and86

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #6 on: April 11, 2017 - 12:44:49 AM »
:iagree: Here is a youtube video from Holley that shows how to adjust the accelerator pump. The Street Avenger 670 may have been rebuilt but never adjusted on engine (dialed in). What engine CID do you have BTW 318? 340?

https://www.youtube.com/watch?v=k-Nx5HEzvlY

Its the 340. My mechanic friend says the 65 primary is too small so he had me order a pair of 68s. The linkage appears to operate fine, I can see squirts when you pull the throttle.

Offline cudamadd

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #7 on: April 11, 2017 - 03:47:42 AM »
I 2 Had the same problem . I fixed the problem placed the holley in the Bin .  my  :2cents: only good for the drag strip  easy to work on get parts any were .But i hate them just me :smokin:
Go 4 a spin Ya Why Not.

Offline 734406pk

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #8 on: April 11, 2017 - 08:53:31 AM »
Its the 340. My mechanic friend says the 65 primary is too small so he had me order a pair of 68s. The linkage appears to operate fine, I can see squirts when you pull the throttle.

Verify that you have no slack in the accelerator pump linkage and adjusted as in the video. Since you are changing the jets, and will have the float bowl off, record the number on the power valve for reference. 340 CID very nice! Do you know what axle ratio is installed?
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive

Offline cv70chall

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #9 on: April 11, 2017 - 08:55:14 AM »
I'm experiencing the same issue- same carb, but new out of the box. I have a 440 engine.


Offline mopar jack

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #10 on: April 11, 2017 - 09:09:29 AM »
What is your initial timing set at? I had cars stumble if the initial timing was to low.

Offline 72and86

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #11 on: April 11, 2017 - 11:03:54 AM »
Its the 340. My mechanic friend says the 65 primary is too small so he had me order a pair of 68s. The linkage appears to operate fine, I can see squirts when you pull the throttle.

Verify that you have no slack in the accelerator pump linkage and adjusted as in the video. Since you are changing the jets, and will have the float bowl off, record the number on the power valve for reference. 340 CID very nice! Do you know what axle ratio is installed?

Sellers ad says: 340 Org Cuda, 727 slapstick Auto, 8 3/4 posi rear.

Offline 734406pk

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #12 on: April 11, 2017 - 09:27:47 PM »
I'm experiencing the same issue- same carb, but new out of the box. I have a 440 engine.

I believe you! These carbs are not tuned out of the box. They need to be dialed in to perform correctly. Since you have the 440, you should start a new thread to prevent confusion. The same info will be needed; Rear axle ratio, standard or auto, cam style (mild to wild) etc. :2thumbs:
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive

Offline 734406pk

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #13 on: April 11, 2017 - 09:31:01 PM »
Sellers ad says: 340 Org Cuda, 727 slapstick Auto, 8 3/4 posi rear.

Thanks! Do you know the ratio of the rear axle? There may still be a tag on the differential or an option code on a build sheet. Or if N/A what is your engine rpm in Drive @ 60 mph?
 
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive

Offline 72and86

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Re: Holley Carb Dies When Foot on the Gas....
« Reply #14 on: April 12, 2017 - 10:21:38 AM »
Thanks! Do you know the ratio of the rear axle? There may still be a tag on the differential or an option code on a build sheet. Or if N/A what is your engine rpm in Drive @ 60 mph?

Where's the dif tag located?
I don't have a build sheet. (No fender tag  :dunno:)
Also I can't take it to 60mph since its not registered yet. I just got it and was driving it around the block.