If necessary, you can use a vacuum gauge to check the for potential leaks. This other post on finding and repairing vacuum leaks goes into more detail and can be of great help if you suspect a leak. Idle the engine and then increase engine speed slightly while paying attention to sounds or smoke coming from the gasket area, pipe connections, or anywhere between the engine and catalytic converter. Inspect the exhaust system for leaks between the engine and the O2 sensor as well.The ECU (car's computer) ends up opening the EGR valve too long, causing a lean condition. On some Ford models, a Delta Pressure Feedback EGR (DPFE) sensor may develop too much corrosion to the point of failure.Check for loose mounting bolts or a damaged gasket under the valve. Although not too common, an EGR valve can also be the source or contributor to a lean condition.Inspect the vacuum hose between intake manifold and charcoal canister purge valve.Make sure each fuel injector is properly seated and their O-rings are not damaged.Check vacuum-operated devices for damage that might be causing a leak.Inspect vacuum hoses routed near hot areas like the engine or exhaust system for possible damage.Other key areas to check for a vacuum leak: If idle speed changes as you spray a particular area, there could be a leak.spray carburetor cleaner around the gasket sealing area with the engine at idle.To check for potential gaskets problems under the throttle body and intake manifold: A loose or damaged boot can introduce unmetered air. Look for potential leaks around the air cleaner assembly, between the MAF sensor and the throttle body.Problems in the vacuum system frequently contribute to a lean condition as well. If necessary, test the MAF sensor using a digital multimeter. Problems with the fuel system or vacuum leaks can also produce some of the same symptoms as well. Check the connector and wires using a digital multimeter (DMM), if necessary. The MAF sensor's harness may be faulty as well. This will prevent contaminating the new or newly cleaned sensor and prolong its service life. If necessary, also replace the air filter and clean inside the filter's housing.Follow the instructions on the product's package to clean the sensor.
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Gain access to the sensor as suggested by your repair manual.You can make a quick visual inspection of the MAF sensor by unplugging the sensor's electrical connector and disconnecting the air house assembly.Ī dirty filament inside the sensor can interfere with the sensor's ability to measure incoming air. Dirt can enter the MAF sensor housing and obstruct the film element or hot wire.
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