CRG Discussion Forum

Camaro Research Group Discussion => Maintenance => Topic started by: HustleRussell on June 13, 2022, 12:00:23 AM

Title: Engine stall
Post by: HustleRussell on June 13, 2022, 12:00:23 AM

Mild 305 engine. Performer intake, headers, mild camshaft, Holley 600 vac secondaries,
TH 400 transmission.Overall it runs good. The problem I’m having is going from 
idle to wot and back to idle as quickly as possible in gear the engine stalls. I’m
Completely stumped. Any advice much appreciated. Forgot to mention the secondaries
are wired closed, only front half of carburetor is functioning.

Title: Re: Engine stall
Post by: uscrichter on June 13, 2022, 10:15:20 PM

Check the carb to intake manifold for slight vacuum leak.

Title: Re: Engine stall
Post by: Fred Mertz on June 13, 2022, 11:05:19 PM

If you don't find a vac. leak try richening the idle mixture adjustment.

Title: Re: Engine stall
Post by: David K on June 14, 2022, 12:21:42 AM

Accelerator pump maybe.

Title: Re: Engine stall
Post by: HustleRussell on June 14, 2022, 01:20:36 AM

Thanks for the replies. I’ve sprayed starting fluid around carburetor and intake, no change in rpm.
I’ve adjusted idle mixture for maximum vacuum of 17hg at 950 rpm.
Accelerator pump is working as it should, tried squirters from 25 to 40, has no effect on stall.
Currently using a 31 squirter. I did notice something I thought was odd, holding engine speed at 3000 rpm fuel is just starting to drip from the main boosters. Shouldn’t the main metering circuit be fully engaged at a lower rpm. I believe it’s still pulling fuel from the transfer slots?

Title: Re: Engine stall
Post by: olddragracer on June 14, 2022, 01:35:37 AM

Engine stalling from operating conditions you describe does not sound unusual. Likely stall only occurs when the car is at rest or moving slowly. Many engines have a vacuum device that slows the carburetor returning to idle to prevent stalling. When the car is at driving speeds the transmission will keep the engine turning over and keep it from stalling.

Title: Re: Engine stall
Post by: Sauron327 on June 14, 2022, 04:47:58 PM

Quote from: HustleRussell on June 13, 2022, 12:00:23 AM

Forgot to mention the secondaries
are wired closed, only front half of carburetor is functioning.

Why????

Title: Re: Engine stall
Post by: HustleRussell on June 14, 2022, 06:59:20 PM

I thought it would be easier to tune the main metering, accelerator pump
and power circuits if the secondaries were not functioning.

Title: Re: Engine stall
Post by: Tinkerr on June 14, 2022, 09:39:16 PM

Have you checked the float level? Remove sight plugs, bump the fender. Should get very small splash of gas.

Title: Re: Engine stall
Post by: HustleRussell on June 15, 2022, 12:46:11 AM

Float levels are set as tinkker description.