1991 Ford Mustang Convertible Other - Engine

Question: Engine is a 5.0. Just recently I have been adding radator fluid every so often with no visible leaks any where in the system. When starting the car it will run rough with white smoke coming out of the exhaust, after car warms up to normal there is no smoke or very little coming out of the exhaust, could I have blown the lower intake gasket what do you think.

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Technican: The engine running rough could be caused from a few items. When was the last time you did a complete tune up to include fuel filter. The white smoke is an indication that either you have a head gasket that is failing (once warm it seals) or you have a leak on the intake manifold (also once warm it seals). To identify which direction to go.. pull the spark plugs and look at them, compare them to new ones and to each other.. is one really discolored or appear clean in comparison to the rest.. this could be caused by the seepage of water into the cylinder and causing a steam cleaning effect or could discolor the plug... Also you did not identify if you have any need to add water or when this problem started.. if it was post overheat you now have a reason for the possible head gasket failure... If you are mechanical in nature and decide to make these repairs yourself.. BE CAREFUL when removing the intake manifold there is an allen head bolt between the runners and needs to be removed first and reinstalled last or you can warp you intake manifold (costing big $$$). Hope this helps.. Al

Owner: I have been adding water every so often and I did a complete tune up on the car just 5 days ago. When I pulled the number three plug it was diff. from the others most were white in color and number 3 was brown in color. The car has not overheated at any point.

Technican: Have you been good at changing your anti freeze every year of do you tend to let it stay in the radiator longer.. like for years at a time.. this is important.. waiting on a reply.

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