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vacuum

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How to Replace a Cruise Control Vacuum Reservoir
The cruise control system has a failing vacuum reservoir if the cruise control does not hold speed or you hear a hissing noise coming from the car.
How to Replace a Vacuum Brake Booster
The vacuum brake booster generates extra force for car brakes. If your car is hard to stop or wants to shut off, replace your brake booster.
Symptoms of a Bad or Failing Vacuum Pump
Common signs include poor fuel efficiency, difficulty pressing the brake pedal, oil leaking under the engine, and the AC not working.
How Long Does a Brake Booster Vacuum Pump Last?
The hydraulic braking system on your car is very complicated. Without all of the various components of this braking system working together, it will be very hard for you to...
How Long Does a Vacuum Pump Last?
Your car’s engine is a very complex piece of machinery. In order for it to function properly, there are a number of different components that will have to work together. Among the...
How Long Does a Brake Booster Vacuum Sensor Last?
In order for a car to have the brake power that it needs, there will have to be a sufficient amount of vacuum power. The engine of a car produces...
Symptoms of a Bad or Failing Thermostatic Vacuum Sensor
Common signs include the Check Engine Light coming on, poor engine performance, and an overheating engine.
How Long Does a Thermostatic Vacuum Sensor Last?
Winter can make for tricky driving conditions - just starting up your vehicle can be a bit more of a chore. When the engine is cold, it takes a few minutes...
Symptoms of a Bad or Failing EGR Vacuum Modulator
Common signs include engine performance issues, the Check Engine Light coming on, and failing an emissions test.
How Long Does an EGR Vacuum Modulator Last?
Not only does the EGR (exhaust gas recirculation) system in your vehicle cut down on emissions, but it also helps to make your engine run more efficiently. However, in order for...
How Long Does a Cruise Control Vacuum Reservoir Last?
The cruise control vacuum reservoir is an air bladder that stores a supply of spare air that is vacuum pressured for when the primary vacuum runs low. This part is...
Symptoms of a Bad or Failing Vacuum Booster
Common signs include a stiff brake pedal, intermittent power to the brakes, and a brake pedal that sinks all the way to the floor when applied.
How Long Does a Vacuum Booster Last?
Without a properly working braking system, it will be nearly impossible to avoid being in a wreck. Most people fail to realize just how important their braking system is until they are...
Symptoms of Bad or Failing Vacuum Hoses
Common signs include the Check Engine Light coming on, engine not running smoothly, and engine losing power or not starting.
How to Replace an Exhaust Gas Recirculation (EGR) Vacuum Modulator
The EGR vacuum modulator meters the EGR valve in some car systems. Some signs of a failing EGR vacuum modulator include stalling and a rough idle.
How to Inspect Car Vacuum Hoses
As you drive your car, your engine draws in massive amounts of air which it then mixes with gas and ignites it to keep the engine running. The vacuum created as a...
How to Replace a Brake Booster Vacuum Sensor
The brake booster vacuum pressure sensor is a vital part of power brake operation. A Check Engine Light or a hard brake pedal are signs of failure.
How to Replace a Cruise Control Vacuum Bleed Switch
Cruise control slows when the vacuum bleed switch activates. It fails if the cruise control deactivates automatically or will not hold the speed.
How to Replace a Coolant Vacuum Valve Switch
A vacuum line attaches to the vacuum switch in your car as part of the engine’s heating and cooling system. A faulty switch can break your heater.
How to Replace a Vacuum Hose
A vacuum hose is failing when the Check Engine Light comes on, the engine does not run smoothly, or the engine loses power and does not start.

Related questions

Question
I have my engine light on, and it popped up as "multiple misfires". I already replaced fuel injectors, coil boots, and spark plugs.
Hi there. For the engine to stall out at a stopped position, then there could be a vacuum leak. Check to see if the engine will stall out when running at idle in park or neutral. If the engine does,...
Question
Car runs rough after it heats up.
Hi there. This sounds like there is a minor vacuum leak on the intake. Check the gaskets around the mounting surface of the intake. Check all vacuum lines coming off the intake and see if they are leaking or cracked....
Question
Heater is blowing mixed temperature air into the cabin area.
Hi there. Check the blend doors to the heater system. The doors could have a leak with the weather stripping. Then check the air ducting in the dash up by the heater blower motor and see if there is a...
Question
Rough idle when in drive..but idle is fine when in nuetral or park
Hi there. Check for vacuum leaks on the engine. A small leak will cause the engine to stumble when the rpm's are low, like in gear on automatic transmissions. Look around the intake manifold for the gaskets being broken. Check...
Question
If the intake manifold has a huge piece broken off of it will the car still start then cut off ?
If the broken off piece is admitting unmetered air to the intake, then yes that will have the effect of stalling the engine. A big initial concern is be sure no debris gets in there because anything in the intake...
Question
I have an aftermarket intake and it's reading 4.9 psi. Is that good or bad?
Hi there. An intake manifold should read 19 to 22 hg. This is 19 vacuum to 22 vacuum. If you are getting a psi reading, then there is either a turbo on your vehicle or the engine timing is out...
Question
High idle problem.
This may be a sign of a vacuum leak. A vacuum leak can be one of the most frustrating and difficult problems to diagnose. High idle speed is a common sign and stalling is another. Confirmation of an engine vacuum...
Question
Sometimes at very low speeds the brake pedal becomes hard and cannot be pressed.
It seems that your brake booster is not working well at low speeds. In this case, when the engine is not able to provide proper vacuum, the brake pedal gets hard. Try to press the brake pedal when the engine...
Question
My vacuum pump seems to be leaking water
Hi and thanks for contacting YourMechanic. Vacuum pumps are required to have oil in them for lubrication. If the pump is leaking water, then either the oil is the wrong type and is leaking out, or the pump has a...
Question
My 4WD is not engaging. Is a 2007 Silverado have electronically controlled axle actuator or vacuum? Or is my problem in the hubs?
Hi there. The actuator on your 4WD system to your vehicle is electronic. Most of the Silverado 2500 model Chevrolet trucks have issues with the actuator failing in the front axle due to weather and road conditions. Check the harness...
Question
The brake pedal is low and hard to press, and my car does not brake well
It sounds like the brake booster is failing. The hissing sound you heard was air leaking through either a vacuum or vent valve in the brake booster itself. The valve failure prevents the booster from generating brake boost, making the...
Question
My 2000 Ford Expedition Eddie Buer 5.4L is stalling and engine dies when I go to brake. Before when I would brake the engine rpm would go up.
Hi there. What is happening is there is a vacuum leak that is present during the braking time. The brake booster either has a vacuum valve leaking or a diaphragm leaking. When stepping on the brakes, the vacuum drops causing...
Question
My truck runs for a few seconds then dies
When you have low fuel pressure but recently replaced the fuel pump and relay, the issue is typically vacuum-related or caused by a clogged or worn out fuel injector. The vacuum issue may be related the the EGR valve or...
Question
Stalling issues while driving
This may be a sign of a vacuum leak. A vacuum leak can be one of the most frustrating and difficult problems to diagnose. High idle speed is a common sign and stalling is another. Confirmation of an engine vacuum...
Question
Two hoses that lead nowhere
I've spent many an hour scratching my head over just this kind of problem. One of the hazards of working on older cars is having hoses and fittings break off while you're trying to get to something else. I know...
Question
What causes loud high pitched whistling sound ?
Of course it's difficult to diagnose a noise without listening to it, but it sounds like you're engine is trying to pull air through a passage that is not quite closing up. When the last mechanic replaced the valve cover,...
Question
My mechanic says I need a throttle body with a vacuum hose for my 04 mercury mountaineer. I've found throttle bodies but none of them mention a vacuum hose.
Hi there. The best thing would be to check the throttle body that is currently on the engine. If the throttle body has vacuum hoses to it, then you would need to get a throttle body with a vacuum hose....
Question
Do you have to remove the transmission on a vacuum pump replacement for 2010 VW Jetta?
The by-the-book way of replacing the brake booster vacuum pump involves removing the transmission in order to have enough room to do the repair properly, but some experienced technicians can complete the job without removing the transmission. This repair should...
Question
My vehicle has a Starting/Sometimes running issue. What's wrong?
Hi there. Check to see if the vacuum pump has seized up on the engine. If the pulley is not turning then the belt will make a screeching noise and put a huge load on the engine. The extra load...
Question
Found misfire on all cylinders by code reader. I checked vacuum and it was low at 14 hg. I checked compression 160 to 180 except no. 3 cylinder 180 to 270.
Hi and thanks for contacting Your Mechanic. When it comes to a misfire, first check for spark and make sure that the spark plugs are functioning correctly. Then check the fuel injectors and make sure that they are not plugged...

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