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Old 05-29-2013, 11:25 PM
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1970 Cadillac 472 ?

Sprayed some cleaner along the drivers side of the intake manifold on the engine while it was running. It began to run rough. Leaking intake manifold gasket ?

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Old 05-29-2013, 11:58 PM
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Originally Posted by Coodeville View Post
Sprayed some cleaner along the drivers side of the intake manifold on the engine while it was running. It began to run rough. Leaking intake manifold gasket ?
Yeap or a vacuum leak in a hose
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Old 05-30-2013, 03:15 AM
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Sounds like a vacuum leak...try spraying a flammable substance over the same area...sometimes your idle will increase...then you know you have a vacuum leak.
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Old 05-30-2013, 07:32 PM
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...but not on the distributor...
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Old 05-30-2013, 08:54 PM
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...but not on the distributor...
Yeah the best way to start a fire on a caddy is with your lincoln welder. Ask me how I know.
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Old 05-30-2013, 10:23 PM
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Yeah the best way to start a fire on a caddy is with your lincoln welder. Ask me how I know.
Best way to incur personal injury is to use an acetylene ax to cut exhaust system components out of the way, while laying on your stomach and wearing a NYLON jumpsuit. Ask me how I know.
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Old 05-30-2013, 10:34 PM
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Originally Posted by Coodeville View Post
Sprayed some cleaner along the drivers side of the intake manifold on the engine while it was running. It began to run rough. Leaking intake manifold gasket ?
The motor ran rough because as it was sitting, the fuel/air mixture was correct and you upset it by spraying and richening the mixture. In other words, whoever tuned the motor, tuned it to run rich from a carburetor standpoint, but just right when the air from the leak was included.
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