[Mgs] Coughing, spitting, and dying

[jimray at hartcom.net]

To all of you who responded to my cry for help, THANK YOU so much for your suggestions. As it turns out, the root cause of the problem was timing. The stock distributor had been upgraded several years ago to a Pertronix electronic module which had worked itself loose inside the distributor causing the timing to become erratic. Tugging on the leads to the coil would cause the engine to increase its RPMs and run smoothly. Pushing them back into the distributor reintroduced the backfire and coughing. 

 

Thanks again for everyone’s help.

 

Jim

 

From: Mgs <mgs-bounces at autox.team.net> On Behalf Of John DiFede
Sent: Sunday, April 24, 2022 7:28 AM
To: Robert Rutherford <rrutherf at ucalgary.ca>
Cc: MGB-V8 at autox.team.net; MG Digest <mgs at autox.team.net>
Subject: Re: [Mgs] Coughing, spitting, and dying

 

Sounds like a fuel problem.  The Edelbrock 1404 is a simple carburetor to work on as it is a copy of the Carter AFB carb used since the 60’s.  Is your choke set properly when cold and hot?   The AFB used a mechanical fuel pump- make sure that facet pump you’re using has the correct fuel pressure for the AFB.  Also check your vacuum.  Is the vacuum reading steady or is the gauge needle fluctuating back and forth?   You may have a vacuum leak affecting fuel mixture.  When the engine is cold and the choke is on you have a rich mixture allowing the engine to run poorly.  Once the choke opens the mixture goes lean due to the vacuum leak possibly leading to your motor stalling.  

Sent from my iPhone 





On Apr 23, 2022, at 11:10 PM, Robert Rutherford <rrutherf at ucalgary.ca <mailto:rrutherf at ucalgary.ca> > wrote:

 Coughs, spits, dies - sounds like Covid to me.





On Apr 21, 2022, at 12:34 PM, Max Heim <mvheim at sonic.net <mailto:mvheim at sonic.net> > wrote:

 


[△EXTERNAL]





Sounds more like a carb/fuel issue to me. Can’t see how it would be electrical.

Sent from my iPad





On Apr 21, 2022, at 11:58 AM, jimray at hartcom.net <mailto:jimray at hartcom.net>  wrote:

 

Have an 80 MGB V8 conversion that has developed a problem I can’t get my hands around. When cold it coughs and sputters when first starting up and when warm will not run at idle without stalling after several minutes. Thinking it might be an electrical issue, I replaced the plugs, plug wires, distributor cap, coil, and battery. It has a PerTronix Ignitor module installed which I did not replace. The battery shows 12.7 volts on my meter. The alternator is producing 14.6 volts at ~1500 RPMs and 14.3 under load. Fuel is fed to an Edelbrock 1404 carburetor via a Facet electric pump with new filters in the line at the pump and just before the carburetor. I use 93 octane non-ethanol gas. I appreciate any thoughts or suggestions you may have.

 

Jim Ray

 

 

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