Barracuda Challenger Forum

Author Topic: Starting Issues?  (Read 757 times)

Offline cv70chall

  • Jr. Member
  • **
  • Posts: 239
  • 1970 Challenger
Starting Issues?
« on: May 17, 2017 - 09:34:55 am »
I have a 70 R/T, 440 Auto with Holley 670 Avenger. Car will fire up normally cold, and 9 times out of 10 normally when warm.
Every 4 or 5 starts, it behaves as if it's not getting fuel- and struggles to start.
Battery and Starter are fine- checked.
Carb issue?
Fuel Pump?

S.O.S.





Offline 69bcuda

  • Jr. Member
  • **
  • Posts: 71
Re: Starting Issues?
« Reply #1 on: May 17, 2017 - 09:50:20 am »
When it has trouble and don't start, pull the air cleaner, pump the throttle once by hand and note the pump shot you get. No shot, low fuel in carb or carb pump is failing.

Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6541
Re: Starting Issues?
« Reply #2 on: May 17, 2017 - 01:34:24 pm »
I had to drill small holes in throttle plates for engine to get enough
air when starting. The newest Holley carbs have a bypass valve
that accomplishes the same thing.

Make sure engine well grounded with big cable/strap.

What is initial timing?
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"


Offline 734406pk

  • Andy
  • Sr. Member
  • ****
  • Posts: 1660
Re: Starting Issues?
« Reply #3 on: May 17, 2017 - 08:07:31 pm »
I have a 70 R/T, 440 Auto with Holley 670 Avenger. Car will fire up normally cold, and 9 times out of 10 normally when warm.
Every 4 or 5 starts, it behaves as if it's not getting fuel- and struggles to start.
Battery and Starter are fine- checked.
Carb issue?
Fuel Pump?

S.O.S.

Are you using an ethanol blend fuel?
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

  • Jr. Member
  • **
  • Posts: 239
  • 1970 Challenger
Re: Starting Issues?
« Reply #4 on: May 18, 2017 - 07:34:38 am »
Yes, 93 Oct when I have to. I try to stay with REC90 when I can.

Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6541
Re: Starting Issues?
« Reply #5 on: May 18, 2017 - 12:24:52 pm »
heat shield around carb? insulated fuel lines?
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline 734406pk

  • Andy
  • Sr. Member
  • ****
  • Posts: 1660
Re: Starting Issues?
« Reply #6 on: May 18, 2017 - 08:19:23 pm »
Yes, 93 Oct when I have to. I try to stay with REC90 when I can.


Common problem with ethanol blend fuel, it has a lower boiling point. When you shut down the engine, the carb can "heat soak"  boiling off the fuel.  You can try a carb heat shield.

http://www.coolcarb.com/index.html

Are you exhaust cross over ports blocked?
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 cudabob496

  • Sr. Resident
  • ******
  • Posts: 6541
Re: Starting Issues?
« Reply #7 on: May 19, 2017 - 12:08:31 am »
easy to make your own with sheet metal.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline 734406pk

  • Andy
  • Sr. Member
  • ****
  • Posts: 1660
Re: Starting Issues?
« Reply #8 on: May 19, 2017 - 12:45:18 am »
I think the Poly-Core insulating material used in the Coolcarb plate has the advantage on blocking heat.
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

  • Jr. Member
  • **
  • Posts: 239
  • 1970 Challenger
Re: Starting Issues?
« Reply #9 on: May 23, 2017 - 03:06:53 pm »
Order in!

Question. I need to know exactly where the idle adjustment is on the Street Avenger 670..

Please

Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6541
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline Chryco Psycho

  • Administrator
  • C-C.com Guru
  • *****
  • Posts: 36612
  • 70 Challenger R/T SE 70 tube Chassis Cuda now sold
Re: Starting Issues?
« Reply #11 on: May 24, 2017 - 03:40:40 pm »
Idle speed is the screw on the throttle shaft lever
Idle mix is 1/3 of the up the sides of the metering plate between the carb bowl & throttle body

Challenger - You`ll wish You Hadn`t

Offline cv70chall

  • Jr. Member
  • **
  • Posts: 239
  • 1970 Challenger
Re: Starting Issues?
« Reply #12 on: May 26, 2017 - 04:18:33 pm »
Not to be stupid, but I can't locate it on the diagram.  Lol

Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6541
Re: Starting Issues?
« Reply #13 on: May 27, 2017 - 01:20:47 am »
Not to be stupid, but I can't locate it on the diagram.  Lol

oops, sorry, my diagram only shows one side of carb.
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline cudabob496

  • Sr. Resident
  • ******
  • Posts: 6541
« Last Edit: May 27, 2017 - 01:28:51 am by cudabob496 »
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.
Up to 4000 RPM, Warp Speed, Up to 5000, Rediculous Speed, Up to 6000 RPM, Ludicrous Speed!

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"