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mgbgt wont start

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rover100rich richard gurner
tipperary, Ireland   IRL
i went to my mgb recently and it wouldnt start ,it always started well ,i chased around for the cause for some days checking points,timing,removed the carbs ,clean fuel etc,on the point of giving up i thought it mustnt be creating lift on the su pistons so i removed the hose from the inlet manifold to brake servo and plugged it,hey presto the engine started up straight away ,so somehow the engine was getting air from the servo,will depressing the brakes get me a seal again?cheers rich

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allanreeling ALLAN R
RANDLAY, TELFORD, Shropshire, UK   GBR
What year, which servo?
A punctured or perished diaphragm, within the servo unit' will bleed air into the inlet manifold giving a very weak mixture.One because of the extra air and second the lack of vacuum pulling less air through the carb and therefore picking up less fuel.
If it's the older, remote, servo the joint between the two halves can slacken off.
The hose itself can perish and crack or be worn through by frictional contact with something.
Answer to your final question.............no!



soonerv8

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rover100rich richard gurner
tipperary, Ireland   IRL
1978 car so later servo,think i will replace it altogether,rich

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allanreeling ALLAN R
RANDLAY, TELFORD, Shropshire, UK   GBR
Well at least check the vacuum hose and the non-return valve rubber seal.



soonerv8

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