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Symptoms of a Bad or Failing Canister Purge Solenoid
Common signs include rough idle, hard starting, and the Check Engine Light turning on.
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...
Symptoms of a Bad or Failing Brake Booster Vacuum Sensor
A failing brake booster vacuum sensor will cause the brake pedal to be stiff or turn on the Check Engine Light.
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...
Symptoms of a Bad or Failing Cruise Control Vacuum Reservoir
Common signs include speed surges and inability to maintain speed on cruise control, as well as general engine performance issues.
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.

Related questions

Car cuts off when put in drive, doesn't go backward - 2007 Chrysler Pacifica
Hello. A common fault with your vehicle is the torque converter clutch not releasing properly. This causes stalling when shifting to Drive or Reverse. If you need someone to come to your car, a mobile expert from YourMechanic can come...
Why does my car jerk & accelerate by its self?
From what you've described, the jerking is most likely due to a misfire or a vacuum leak on the engine. You should have all the spark plugs and wires checked for misfiring after your computer is scanned for a misfire...
Vacuum hose unhooked brake - 1990 Dodge D150
Hello. The vacuum hose from the brake booster goes into a tube on the intake. This tube is going to be about the same diameter as the hose and may need a clamp to secure it properly. The small vacuum...
can cup hands over carburetor when its running and it will not stall
Hello and thank you for your question. Yes, you are right but only if you have completely shut off the air intake at that point. Not sure that cupping your hands will do it but surely you can be the...
second gen motor swap
I would recommend keeping all motor components with the same motor (i.e. ECU, wiring harness, etc.) when doing this kind of a swap to eliminate any potential problems. Although there may be some components that are interchangable, you will save...
Failed emissions, says that bank system 1 is too lean. The car had sat for almost a year.
Hello there, thank you for asking about your 1999 Nissan Altima. You need to fix any vacuum leak where un-metered air is getting in to the intake manifold. The additional air getting into the engine will cause the lean codes....
Car doesn't start
Hi there, thanks for writing in. I'd be happy to help. This suggests you have a vacuum leak or some kind of fuel supply issue. I recommend checking the injector voltage to be sure they are getting the correct amount...
2500 RPM idle on cold start. Is this normal? If not, then is it due to a cold start injector?
A higher than normal idle can be due to a stuck open idle control valve or a vacuum leak in the intake when the engine is cold. You may have a bad cold start injector system. I would recommend having...
Possible vacuum leak on my 2005 PT Cruiser. How bad is it?
You may have a vacuum leak in the intake air tubing between the turbo and the throttle body or mass air sensor. I would recommend having the engine checked and diagnosed by a certified mechanic from YourMechanic.
Misfires while idling
Hello there, thank you for asking about your 1986 BMW 635CSi. It sounds like you've checked all of the low hanging fruit. The previous owner may be right - some vehicles (only German ones come to mind) can develop a...
Rom is running high in my truck
Hello. This is a sign of a vacuum leak. A vacuum leak can be one of the most frustrating and difficult problems to diagnose. Idle speed that is way too fast is one of the common signs and stalling is...
Intake plenum
If the engine runs perfectly fine, this is likely not a spot for a vacuum hose. If a vacuum hose went there, the engine would run very poorly due to the major vacuum leak. I know that the 3.1L V6...
Idling high/low and car shuts down
Hello there, thank you for asking about your 1989 Dodge Ramcharger. Possible causes for this situation are a failed ignition component or an automatic shutdown relay experiencing a malfunction. Have one of our mobile experts take a look at the...
Vacuum hose to the charcoal cannister has broken
Hello. If you have broken the vacuum port off of the charcoal canister, then it may have to be replaced. In some instances, the broken piece can be reattached. However, it will only function properly is a vacuum tight seal...
Rough idle sucking noise - 1989 Plymouth Acclaim
Hi there, thanks for writing in. If the loud sucking noise isn't coming from the large throttle body bore, you may still have a vacuum leak present. Any leak after the throttle opening will cause performance issues. The leak can...
My car is C180 AMG. My car jerks but when i unplug the airflow meter sensor it drives normal, its a new airflow meter.
Hello there, many different faults can cause the MAF sensor on your 1999 C180 to cause the car to run poorly. If the MAF sensor was replaced and the problem still remains than the most likely faults are a vacuum...
Vacuum hose function.
Hi there. If there is a problem with your vacuum hoses, then they need to be replaced. If they are clogged, leaking, or just very soft then they need to be replaced as they can cause a series of running...
Bleeding Brakes
It is nearly impossible to bleed brakes with a vacuum pump and not see bubbles. The bubbles are not actually coming from inside the brake line. Therefore, this air is something that can be dismissed. The pedal should still become...
Where is the vacuum check valve located on a vacuum assisted brake booster?
The check valve is built into the hose that connects to the brake booster. The hose should be disconnected from the booster connection when removing the master cylinder. If you apply vacuum to the hose after you remove it from...
Fuel vacuum line
We would need to know the exact code your vehicle is setting. The code should have a complete pinpoint test done to locate the problem. Once the tests are done, then the system can be fixed. Driving the vehicle with...

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