Won't pass inspection, paper says it has a vacuum leak. Where can that be? Would it be a hose I can change? I can't afford to take it to a garage, I want to try to fix it, but don't know how to tell where it is.
A vacum leak... this is when the engine has an area that is taking air into, like a crak on th e intake manifold or a missing pcv valve. Usally there is a diagram under the hood that will identify the vaccum hoses on the intake body and where they are located.
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Random misfires could be gas related- low fuel pressure, vacuum leaks or air leaks upsetting the air/fuel mixture ratio, clogged air filter or fuel filter. Could be ignition related- worn spark plugs, possibly. Or could be an internal mechanical problem-possible valve train malfunction.
Start with a fuel pressure test. check vacuum hoses for leaks, check intake manifold and throttle body assembly for leaks. If you have an exhaust leak at or near the engine, can cause misfires. Air going into the engine is metered by the mass air flow sensor in the big air boot on the throttle body. If extra air gets into the engine through a vacuum leak or a loose hose, the engine computer won't know it, so the air/fuel mixture will be too lean, resulting in misfiring. Several things to check-good luck.
you may have a simple vacum leak. follow all the vacum hoses and look for dry rotted hoses or hoses with holes in them. like the one that goes to the mass air sensor would be a good place to start. if you find bad hoses than replace them.
The small[pencil size] hose connected just below the radiator cap & to the plastic coolant reservior is the coolant over-flow hose,allowing the coolant to flow into the tank as it expands from being heated,and return to the system as it cools.If the leak is near the radiator fitting,possibly damaged portion can be cut off while engine is cool,and hose re-fitted.Replacement tubing is available at auto parts supply stores,identifiyed by it's inside diameter measurement.
Fallow the "UPPER" Radiator Hose from the Radiator to the Engine Cylinder Head, The Thermostat Housing is the Unit that the UPPER Radiator Hose Connects to. Theres is 1 BOLT (TOP) & 1 NUT (BOTTOM) that you Remove to Gain Access to the Thermostat itself. Hoping this Helps you out There . Have A Great Day.