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Our MGB: when motor is running, all lights flicker and rev

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Our MGB : when motor...
Our MGB : when motor is running, all lights flicker and rev counter bounces. Wondering what is going on. Slight miss in the motor occasionally. Can you help.
Submitted: 1 year ago.Category: Car
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Customer reply replied 1 year ago
Ignition light flickers as well
Answered in 28 minutes by:
3/25/2016
Auto Mechanic: John Vieira, Auto Mechanic replied 1 year ago
John Vieira
John Vieira, Auto Mechanic
Category: Car
Satisfied Customers: 77
Experience: ASE Certified Technician 32 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Hi I will try and help you tonight

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Customer reply replied 1 year ago
Have not heard anything from you yet?
Auto Mechanic: Classic Car Service, Dealership Svc. Mgr. replied 1 year ago
Classic Car Service
Classic Car Service, Dealership Svc. Mgr.
Category: Car
Satisfied Customers: 4,989
Experience: Over 30 years experience in the automotive field
Verified

Hello. Different expert here. I see that you have been waiting for assistance. Please allow me to add some input. On these cars, the main cause of the dash lights flickering is eithe a loose alternator belt of a faulty alternator (assuming your misfire is not causing the RPM to drop substantially).

Engine misfires on these cars are common. There are quite a few vacuum lines under the bonnet that can become weakened with age, and develop pin hole vacuum leaks. It does not take much of a vacuum leak to compromise your idle quality. Assuming the engine is in a proper state of tune (good/new plugs, cap wires, rotor, etc), If this car was in my shop I would be looking at each and every vacuum line in the engine compartment for cracks, brittleness, softness, poor fit, etc. I have worked on a lot of the MG product over the years (I own an older Lotus), my experience with these issues leads me to believe your major concern is vacuum issues. It is also possible that you have a vacuum leak at the intake manifold gasket or under the carb.

If you have any questions, please feel free to reply; I will be very glad to help you further.

If you do not have any questions, and are satisfied with my input on your request, thanks for choosing Just Answer. It was a pleasure to assist you today. I trust my input to your request is satisfactory to you and meets your expectations.

A positive rating would be greatly appreciated for my assistance on your inquiry.

Thanks in advance and thank you again for choosing Just Answer

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