Stalling under acceleration?

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Apr 26, 2004 | 11:04 AM

Captain_Kaboom

Thread Starter

Racer

Joined: Jan 2002

Posts: 488

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From: Woodstock GA

Stalling under acceleration?

When I step on the gas from idle, the RPMs climb a bit then quickly fall, like the car is going to stall out- but continues running. If I slowly apply pressue to the gas pedal, the RPMs appear to climb fine. It has been also tough starting while cold, which has never happened before. It's got a fairly new starter and battery.

Any suggestions?

Thanks!

Apr 26, 2004 | 11:15 AM

Boofers

Drifting

Joined: Nov 2002

Posts: 1,665

Likes: 1

From: Ontario

Re: Stalling under acceleration? (Captain_Kaboom)

What carb are you running? Have you recently made any changes to your carb or ignition system?

[Modified by Boofers, 10:15 AM 4/26/2004]

Apr 26, 2004 | 11:45 AM

Captain_Kaboom

Thread Starter

Racer

Joined: Jan 2002

Posts: 488

Likes: 0

From: Woodstock GA

Re: Stalling under acceleration? (Boofers)

It's a rebuilt Q-jet. I did put in some steel braided Taylor plug wires, that is the only change I made.

Apr 26, 2004 | 11:48 AM

78 Vette

Drifting

Joined: Jan 2002

Posts: 1,500

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From: N.Y

Re: Stalling under acceleration? (Captain_Kaboom)

firing order?
18436572

Apr 26, 2004 | 12:04 PM

Captain_Kaboom

Thread Starter

Racer

Joined: Jan 2002

Posts: 488

Likes: 0

From: Woodstock GA

Re: Stalling under acceleration? (78 Vette)

I don't think so...I replaced them one at a time, and it ran great for a couple of days before this started. I noticed a bit of slugishnees around 2400-2800 rpms, but other than that nothing...

Are the secondaries on the carb supposed to be easy to open/close by hand, or should there be a bit of resistance to them?

Apr 26, 2004 | 12:21 PM

verskel

Safety Car

Joined: Jan 2000

Posts: 4,143

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Re: Stalling under acceleration? (Captain_Kaboom)

Quote:

Are the secondaries on the carb supposed to be easy to open/close by hand, or should there be a bit of resistance to them?

IF they're vacuum operated then they'll open easy by hand. It's the downward force of the increase air velocity which causes them to open.

I'm thinking that your getting too much air & not enough fuel when you stomp on it causing a 'severe' hesitation and near-stall situation.

LARS is the expert on Quadrajets. He can help you with the tuning, just send him an IM. ;)

Apr 26, 2004 | 07:22 PM

Captain_Kaboom

Thread Starter

Racer

Joined: Jan 2002

Posts: 488

Likes: 0

From: Woodstock GA

Re: Stalling under acceleration? (verskel)

humm- then the carb isn't getting enough fuel then, you think? It wouldn't be a fuel pump problem?

Apr 27, 2004 | 10:13 AM

Stewart's74

Safety Car

Joined: Aug 2000

Posts: 3,943

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From: Florham Park NJ Port Credit Ontario

Re: Stalling under acceleration? (Captain_Kaboom)

Accelerator pump in the carb.

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Apr 27, 2004 | 10:32 AM

wcsinx

Team Owner

Joined: Mar 2002

Posts: 24,160

Likes: 78

Re: Stalling under acceleration? (Stewart's74)

Quote:

Accelerator pump in the carb.

:iagree:

My guess as well.

The condition you described is precisely what the accelerator pump is meant to counteract. Carb can't react fast enough to sudden fuel demand when the pedal is stabbed hence the accel. pump.