To check for restricted exhaust, which it may be, hook a vacuum guage to a manifold signal and increase engine speed in park to approximately 2,000 to 2,500 RPM's and watch the guage. If the exhaust is restricted, it will slowly decrease vacuum relative to the blockage. If it's not restricted the vacuum will "top out" and stay there. If it is restricted, make sure you hit the exhaust other places to see if the material, usually catalyst, travelled downstream. Gerard
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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