car stumbles in the air!

TinSoldier 3215 · 06-05-2011, 01:38 PM

The car is a camaro, engine is a 350 and carb is a quadrajet. As far as Jeff's reply I don't understand what he's saying?? If the fuel pressure is off, then what should it be??

it has been 7lbs. When it comes out of the water box it has no hesitation, no stumble, it's just when u stage and go up on rpm's and release the trans brake button it hesitates and when it comes down and planes out, it runs great!!

Do you think it could be a fuel pressure issue?? Thanks for any response...

Dragsinger · 06-05-2011, 01:58 PM

Jones,

judging by your first post you have checked the basics for a bad part. So, it is reasonable to look at other items. [and do not mean any disrespect, just beginning the brainstorming process] begin looking at the entire package in a different light. That is to say, go back and look carefully at every small thing. Look at every wire, every ground, every terminal connection, etc.

One idea is to have someone else drive the car while you look and listen, might give a different idea of what is happening.

Bob Pagano · 06-05-2011, 02:00 PM

Fuel pressure or bad ground that only happens when you do a wheelie would be where I would start.

TinSoldier 3215 · 06-05-2011, 02:50 PM

And just to add the car is still in low gear. and I did have the trans brake button break on me and the wires touch. Do you think that the trans brake button by touching could have shorted sum thing out?

Thanks for the help.. I'm stumped.. it's in low gear in the air.

Ed Wright · 06-05-2011, 03:05 PM

Hmm, sounds familiar. Re-check all your grounds. That was my problem.

TinSoldier 3215 · 06-05-2011, 03:13 PM

Thanks Ed.

Jeff Niceswanger · 06-05-2011, 05:43 PM

Just to be sure its not a fuel issue, put the .149 ( bigger) needle and seat in the carb at the same float height as the previous ones. We have had that same issue before. If it gets alot better or cures the problem, you have a supply problem

Gary Parker · 06-05-2011, 06:01 PM

when I had this problem, it was a bad regulator. I also just discovered a bad gauge. Sounds like it is running out of fuel to me. Check the flow from the out side of the regulator Gary

Bob Mulry · 06-09-2011, 12:34 PM

Hi,

Just a heads-up on the adjustable type transbrake buttons......

Some of the "adjustable" buttons have the return spring set as to be the softest possible and the weight of the button and plunger along with the additional "G" force of the launch are enough to slightly depress the button and cause a miss.

They have to build it this way to allow the plunger to return as slowly as possible to the top of travel to allow adjustability..

Put a different button in or if it's OK reinstall your old button and give it a shot...

Bob

Tod Lane · 06-05-2011, 09:14 PM

Stalling the fuel in the line? Fuel line too big maybe?

06-05-2011, 01:38 PM	#1
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: car stumbles in the air! The car is a camaro, engine is a 350 and carb is a quadrajet. As far as Jeff's reply I don't understand what he's saying?? If the fuel pressure is off, then what should it be?? it has been 7lbs. When it comes out of the water box it has no hesitation, no stumble, it's just when u stage and go up on rpm's and release the trans brake button it hesitates and when it comes down and planes out, it runs great!! Do you think it could be a fuel pressure issue?? Thanks for any response...

06-05-2011, 01:58 PM	#2
Dragsinger VIP Member Join Date: Jul 2008 Location: Liberty City [East Texas] Posts: 1,760 Likes: 5 Liked 99 Times in 60 Posts	Re: car stumbles in the air! Jones, judging by your first post you have checked the basics for a bad part. So, it is reasonable to look at other items. [and do not mean any disrespect, just beginning the brainstorming process] begin looking at the entire package in a different light. That is to say, go back and look carefully at every small thing. Look at every wire, every ground, every terminal connection, etc. One idea is to have someone else drive the car while you look and listen, might give a different idea of what is happening. __________________ Larry Woodfin 471W

06-05-2011, 02:00 PM	#3
Bob Pagano VIP Member Join Date: Jun 2002 Location: New Holland, PA Mooresville,NC Posts: 1,163 Likes: 241 Liked 16 Times in 11 Posts	Re: car stumbles in the air! Fuel pressure or bad ground that only happens when you do a wheelie would be where I would start. __________________ Bob Pagano A/SA

06-05-2011, 02:50 PM	#4
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: car stumbles in the air! And just to add the car is still in low gear. and I did have the trans brake button break on me and the wires touch. Do you think that the trans brake button by touching could have shorted sum thing out? Thanks for the help.. I'm stumped.. it's in low gear in the air.

06-05-2011, 03:05 PM	#5
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: car stumbles in the air! Hmm, sounds familiar. Re-check all your grounds. That was my problem. __________________ Ed Wright 4156 SS/JA

06-05-2011, 03:13 PM	#6
TinSoldier 3215 Member Join Date: Jul 2009 Location: Bulington, Ky Posts: 359 Likes: 0 Liked 6 Times in 5 Posts	Re: car stumbles in the air! Thanks Ed.

06-05-2011, 05:43 PM	#7
Jeff Niceswanger Senior Member Join Date: Jul 2003 Posts: 894 Likes: 686 Liked 1,034 Times in 368 Posts	Re: car stumbles in the air! Just to be sure its not a fuel issue, put the .149 ( bigger) needle and seat in the carb at the same float height as the previous ones. We have had that same issue before. If it gets alot better or cures the problem, you have a supply problem __________________ Jeff Niceswanger 3740 SS

06-05-2011, 06:01 PM	#8
Gary Parker Senior Member Join Date: Apr 2004 Location: Westfield Mass Posts: 529 Likes: 368 Liked 425 Times in 56 Posts	Re: car stumbles in the air! when I had this problem, it was a bad regulator. I also just discovered a bad gauge. Sounds like it is running out of fuel to me. Check the flow from the out side of the regulator Gary __________________ Gary Parker 1617 STK

06-09-2011, 12:34 PM	#9
Bob Mulry VIP Member Join Date: Apr 2002 Location: Coarsegold, CA Posts: 1,016 Likes: 57 Liked 320 Times in 102 Posts	Re: car stumbles in the air! Hi, Just a heads-up on the adjustable type transbrake buttons...... Some of the "adjustable" buttons have the return spring set as to be the softest possible and the weight of the button and plunger along with the additional "G" force of the launch are enough to slightly depress the button and cause a miss. They have to build it this way to allow the plunger to return as slowly as possible to the top of travel to allow adjustability.. Put a different button in or if it's OK reinstall your old button and give it a shot... Bob __________________ Bob Mulry 7516 STK A & M Motorsports

06-05-2011, 09:14 PM	#10
Tod Lane Member Join Date: Jul 2008 Posts: 152 Likes: 0 Liked 2 Times in 2 Posts	Re: car stumbles in the air! Stalling the fuel in the line? Fuel line too big maybe? __________________ Tod Lane Swartz & Lane 66 Nova Swartz & Lane 79 H/CM Trans Am