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clean your maf(mass air flow sensor)
The engine may backfire excessively. You may also smell a strong exhaust odor in the riding position. In worst cases, it can cause the engine to run lean.
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Try replacing your Oxygen sensors they are located on the catalytic converter. I had the same problem with my 94 Caprice and that turned out to be the problem.
You may have a blown head gasket, or less likely a cracked engine block. In either case, some symptoms are a loss of power/ rough running engine and white exhaust smoke.
possible blown head gasket, and a fuel leak /// unless is a diesel engine, in which case it probably running too rich, possible turbo, possible valve timing, possible intercooler
Depends on the engine, really.
one way to check for leaks on your exhaust is to jack your car up get a strong blue LED torch and scan the exhaust starting from the engine mount right the way down the tell tale sign's of having an exhaust leak is , if you see a charcoal colored substance on your exhaust that means either a hole is there or one is developing another way is to think back are you putting a lot more fuel in the car than you normally did ? as when exhausts get holes in it lets AL-OT more carbon emissions out there for basically just drinks your fuel
Without knowing the milege or condition of the body, selling the car in good condition would bring you in 1500, maybe. Kelly Blue Book cites a thunderbird in excellent condition with 140000 miles at $2015.
There is a strong possibility that you have either a blown head gasket or cracked cylinder head.
It might be coolant, oil burning or too rich of fuel air mixture
race cars run a very rich mixture. when the engine dies, the unburnt fuel in the exhaust system catches fire from the heat in the exhaust pipes. when the engine is refired, the fire blows out. Flames come out the exhaust during the deceleration of a racing car because during wide open throttle the intake manifold and intake port are filled with a homogenized air fuel mixture. When the throttle is suddenly closed the velocity of this mixture stops and the pressure drops into a strong vacuum. This causes the fuel to drop out of suspension (in the air) and return to a liquid state. This liquid fuel is drawn through the combustion chamber and ignites when it reaches the hot exhaust valve and pipes resulting in the visable flames from the end of the pipe.