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The pulse damper vacuum hose on a 2001 Mazda Tribute V6 3.0 connects to the intake manifold. Look for a small vacuum hose coming from the pulse damper and follow it to the intake manifold. The intake manifold is typically located on the top of the engine and will have a series of hoses and cables connected to it. The pulse damper is typically located near the fuel injectors and fuel rail. Make sure the hose is connected securely and in good condition, as any leaks or damage can cause issues with the engine's performance.
There are several. They go to the transmission, the idle control valve, the fuel cannister, cruise control fuel pressure regulator and inside to the heater/ ac controls There is a place on the intake manifold where a vacuum hose will connect to that distributes vacuum to all the other places vacuum is needed.
if im not mistaken the number 3 coil is on the right hand side of the motor so you will need to remove the intake manifold to gain access to it. Intake Manifold
Removal
Remove the engine cover (if equipped).
Remove the air filter outlet pipe.
Remove the positive crankcase ventilation hose.
Remove the air cleaner resonator.
Disconnect the throttle body electrical connectors.
Disconnect the electrical connectors.
Detach the vacuum hoses.
Press the retaining ring. (1)
Detach the vacuum hose. (2)
Disconnect the vacuum hose.
Detach the injector harness electrical connector from the intake manifold
support bracket.
Remove the intake manifold support bracket.
Detach the engine wiring harness bracket.
Detach the intake manifold support bracket.
NOTE:
Remove and discard the O-ring seal.
In the engine compartment, locate black vacuum hose that runs from brake booster check valve to intake manifold, there will be a small vacuum hose attached to check valve at the power brake booster check valve. This is the vacuum line going to the heater control unit,check the hose all the way to the firewall, repair any leaks you find. And that should take care of your problem.......GOOD LUCK
Probably a vacuum line. Most heater controls are ran by vacuum and their is one vacuum line that goes from the troddle body to the firewall on the passenger side of the car. Check for a broken hose.
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