Some vehicles, specially Asian brands, come with several vacuum hoses that can make it confusing to repair when they interconnect in various ways.
2015 MAZDA 6 P0171 MANUAL
Follow the instructions in your vehicle repair manual to replace either gasket.If the leak is still present, you'll need to replace the intake manifold gasket or throttle body gasket.Tighten the bolts to the torque listed in your vehicle repair manual using a torque wrench.Tighten the bolts gradually, following a crisscross pattern-when tightening a manifold, start at the center and work your way out.If you found a vacuum leak either at the intake manifold or at the base of the throttle body, first try tightening the intake or throttle body mounting bolt: If there's a leak, you'll hear a hissing sound. Note: To use a hose (or mechanic's stethoscope), place one end of the hose against your ear and move the other end of the hose around the edge of the intake manifold gasket and carburetor or throttle body gasket. If the engine smooths out as you spray water, you've found the vacuum leak you may also see bubbles on the location of the vacuum leak.Listen for any changes in the engine idle.Don't forget to visually check the intake manifold itself for cracks and spray water on suspect spots. To use the soapy water, spray a little around the intake manifold where it mates with the cylinder head and around the base of the carburetor or throttle body.
![2015 mazda 6 p0171 2015 mazda 6 p0171](https://i3.infocar.ua/img/bazar2/796/795389/6197666_3.jpg)
Block the wheels to be safer and prevent the vehicle from moving.Set your transmission to Park (automatic) or Neutral (manual).A length of hose (or mechanic's stethoscope).To check these gaskets you can use one of two simple alternative methods: A steady low or very low reading may point to a gasket (intake or throttle) leak, among other potential faults. Pay special attention to needle movement patterns. If you don't own a gauge or don't want to buy one right now, your local auto parts store may loan you one.įollow the instructions that come with the tool and the tips included in the post linked above. You can also use a vacuum gauge to further confirm the presence of a vacuum leak, if necessary. You can also spray water on a hose, ports and connectors to help you check for leaks. If you find a hose with a softened, hardened, or damaged spot, replace it.Pinch the vacuum line leading to the device, and spray soapy water on it and hear for a change in idle speed. Check the devices for damage like cracks, dents, and loose parts. As part of your visual inspection, include the devices the vacuum hoses connect to.You may need to test the device for proper operation. If you find a foreign substance inside the hose, contamination has potentially reached inside the device as well, probably not functioning properly. Disconnect the hose from the device it connects to and check inside the device connector. Check the hose for contamination as well, like oil, coolant, or some other substance.If the rough idle improves, check the brake booster and valve. Use a shop rag between the pliers and hose to prevent damage. You can check a leaking brake booster at idle by blocking the vacuum hose with a pair of Vice Grip pliers.If leaking, you may hear a hissing sound. Pay special attention to the check valve that connects the brake booster to its vacuum hose.Also, check hose connectors, tees, and unions for cracks and looseness.Check if the hose is near or touching a hot surface.Also, try to feel for vacuum at those rough or uneven spots.
![2015 mazda 6 p0171 2015 mazda 6 p0171](https://i.gaw.to/vehicles/photos/06/39/063997_2015_mazda_Mazda6.jpg)
Trace the length of the hose with your fingers to feel for rough, hardened, splitting, softened, or out-of-shape spots, especially around the hidden, underside of the hose.If the inside end of the hose is torn, worn, or widened, cut off the damaged part and plug the hose back to the fitting. Unplug and inspect both ends of the hose.You may need to use a small mirror and a flashlight to check on hard-to-reach places, like behind the intake manifold, throttle body, or exhaust manifold. It's easy to knock a hose loose inadvertently when doing maintenance or replacing a component. Make sure the hose is properly connected, not loose or hanging free.Set the transmission to Park (automatic) or Neutral (manual) and apply the emergency brake. Follow the next steps to check each vacuum hose, keeping a reasonable distance from moving components during your inspection: