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MGB won't start

Posted by dbakerjr

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MGB won't start #1
dbakerjr Don B Akron, USA	Posted: August 07, 2012 11:31AM Registered: 1 year ago Posts: 4

My 74 MGB backfires at intake/exhaust manifold joint to the cylinder head. There is no suction through SU carbs when engine is turning. Could I have an intake leak or cracked manifold? Already replaced intake/exhaust gasket and it still won't fire. Can anyone help?

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Re: MGB won't start #2
locolobo85 Brad Batchelor North Carolina, USA 1975 MG MGB "Abbigail"	Posted: August 07, 2012 12:00PM Registered: 7 years ago Posts: 825

Fuel, air and fire.

Seems that a crack big enough to keep the engine from catching life would be easy to spot.

Got fuel at the carbs?

Got spark at the plugs?

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Re: MGB won't start #3
dbakerjr Don B Akron, USA	Posted: August 07, 2012 12:03PM Registered: 1 year ago Posts: 4

I've got fuel to the carbs, spark to the plugs (new coil) and it will fire if I use starter fluid or pour gas through the carbs. I'm stumped.

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Re: MGB won't start #4
locolobo85 Brad Batchelor North Carolina, USA 1975 MG MGB "Abbigail"	Posted: August 07, 2012 12:09PM Registered: 7 years ago Posts: 825

Are you literally seeing backfire from the manifold and not back through the carbs?

More info more info more info......

When was the last time it ran?

Last proper tune up?

etc......

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Re: MGB won't start #5
dbakerjr Don B Akron, USA	Posted: August 07, 2012 12:23PM Registered: 1 year ago Posts: 4

Fire is coming from the manifold where it meets the head, but only when I feed it gas or starter fluid. Last ran last Dec and it ran fine. Tried to start it when it backfired and wouldn't start again. Any suggestions?

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Re: MGB won't start #6
locolobo85 Brad Batchelor North Carolina, USA 1975 MG MGB "Abbigail"	Posted: August 07, 2012 12:32PM Registered: 7 years ago Posts: 825

Post a pic?

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Re: MGB won't start #7
dickmoritz Dick Moritz Philly 'burbs, PA, USA	Posted: August 07, 2012 12:45PM Registered: 3 years ago Posts: 7,253

Good chance the backfire blew out one of the plugs in the front or rear of the intake manifold...

Dick

Errabundi Saepe, Semper Certi
(Often wrong, but always certain)

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Re: MGB won't start #8
dbakerjr Don B Akron, USA	Posted: August 08, 2012 12:18PM Registered: 1 year ago Posts: 4

I never thought of that. I'll check it out. Thanks

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