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valves

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Symptoms of a Bad or Failing Proportioning/Combination Valve
If your rear brakes are locking up, especially on wet surfaces, you should have a mechanic inspect the proportioning/combination valve.
5 Commonly Overlooked Vehicle Maintenance Items
Brake fluid, auto transmission fluid, and coolant flushes, as well as cabin filter changes and valve adjustments, are all important services.
How to Check an Idle Air Control Valve
Idle air control (IAC) valves regulate the engine idle speed. Engine idle speed is the revolution speed of the engine when the throttle is inactive.
Bent Valves and Other Common Issues After a Timing Belt Snaps
Ignoring your timing belt can come with a high cost. Timing belts don’t often snap, but when they do, it can cause...
Bent Valves and Other Common Issues After a Timing Belt Snaps
Ignoring your timing belt can come with a high cost. Timing belts don’t often snap, but when they do, it can cause...
Bent Valves and Other Common Issues After a Timing Belt Snaps
Ignoring your timing belt can come with a high cost. Timing belts don’t often snap, but when they do, it can cause...
Bent Valves and Other Common Issues After a Timing Belt Snaps
Ignoring your timing belt can come with a high cost. Timing belts don’t often snap, but when they do, it can cause...
How to Replace a Vacuum Brake Booster Check Valve
Brakes are assisted by the vacuum brake booster check valve that fails when the brake pedal is hard to press, feels spongy, or does not work at all.
What Causes a Car to Backfire?
You’ve got an image of it in your head right now. An old car drives off jerkily from a stop sign, tires screeching as...
Symptoms of a Bad or Failing Valve Cover Gasket
Common signs of a faulty gasket include a burning oil smell, dirty valve cover, oil leaks, low engine oil, and a rough-running engine that misfires.
Symptoms of a Bad or Failing Positive Crankcase Ventilation (PCV) Valve
Common signs of a faulty PCV valve include excessive oil consumption, oil leaking, a blocked breather filter, and reduction in overall performance.
Symptoms of a Bad or Failing Vacuum Brake Booster Check Valve
Common signs of a faulty vacuum brake booster check valve include the brake pedal being difficult to engage, feeling spongy, or not working at all.
Symptoms of a Bad or Failing Idle Control Valve
Common signs include irregular or unusually high idle speed, the Check Engine Light coming on, and stalling while idling.
How to Replace an Air Conditioning Expansion Valve (Orifice Tube)
Car air conditioning systems need the expansion valve, or orifice tube, replaced if the AC is blowing warm air or the AC system is broken.
How to Replace an Exhaust Gas Recirculation (EGR) Valve
The exhaust gas recirculation (EGR) valve can cause drivability problems if it fails and should be replaced to avoid engine performance issues.
How to Replace an Air Diverter Valve
Car air diverter valves add clean air from the air pump to the emissions system to push out pollutants. Air valves are critical for car performance.
How to Replace a High Pressure Safety Valve
High pressure safety valves help the car engine run smoothly. Oil filter housings can burst if high pressure relief valves are stuck closed.
How to Replace a Proportioning Valve
The brakes on the rear wheels may lock up when the brake is applied especially when surfaces are wet if the proportioning valve is failing.
How to Replace Your Car Idle Air Control Valve
The IAC valve, or idle air control valve, dictates your vehicle’s idle. A faulty valve can lead to rough idling and stalling, among other problems.
How to Replace a Car Combination Valve
The combination valve balances your brake system. If broken, it should be replaced to ensure a safe driving experience.

Related questions

Question
Timing belt broke
I believe that you are right: your drive belt is broken. Unfortunately, this happens to everyone at some point. The best course of action is just to replace the belt. I don't believe anything happened to any internal engine parts...
Question
RPM fluctuates
With the age and mileage of your vehicle, it would probably benefit from a throttle body service including cleaning the idle air control valve. Over time, oil and carbon build up on the throttle blade so it does not sit...
Question
Oil steam exhaust pipe
Hello there, thank you for asking about your 1991 Geo Storm. After your comment about flooding the parking lot with steam, this symptom leads me to believe you may have a failed head gasket. A failure in this seal will...
Question
Oil light on
Hello. The PVC valve shouldn’t cause your oil light to come on. Most likely, the problem is that the oil is low, which would cause the light to come on. The oil pressure could be faulty, which would also cause...
Question
My engine is knocking
When your car begins to knock due to a lack of oil, this could mean many different things, such as broken or bent valves, a bad camshaft, rod or main bearings, and many other different things. As you may know,...
Question
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...
Question
I have a problem with the idle of the
This may be a sign of a failing idle air control valve. The idle air control valve is located on or near your intake manifold that monitors the air intake as it is mixed with fuel prior to being injected...
Question
Cylinder 2 misfire
You need to pull out the coil and check to see if there is oil in the spark plug hole, or on the plug wire boot. If there is, then replace the valve cover and spark plug boots after cleaning...
Question
Car stuck in limp mode
It sounds like one of the shift solenoids is not functioning properly. I would recommend having a technician come out from YourMechanic and pull the codes on the computer, replace the shift solenoid, and change the transmission filter and fluid....
Question
Car stalls at a low speed
Hello. You can try and clean the IAC valve, but if it is bad, it will need replacement. Cleaning the IAC valve would only be a temporary fix. The IAC valve is usually attached to the throttle body, and can...
Question
Car keeps dying
There are usually two different issues that cause the engine to stall or reduce RPM in situations like this. The first thing I'd look at is the idle control valve or sensors that monitor the fuel system. The second item...
Question
broken timing belt
Replacing the timing belt is not a job to take lightly. If you have never done one before, I suggest you get a shop manual. If your belt broke while you were driving, you probable bent valves in the head....
Question
AC not working properly.
Your low-pressure reading of 80-85 psi is a bit high. Even with ambient temperatures of 100 degrees, a reading of 50-60psi is normal. A few things can be causing that high reading. First, if the system has been charged recently,...
Question
Smaller serpentine belt shredded and pieces went into the crank shaft Tried to start timing jumped. How do I fix? 05' kia op 2.4L
The KIA 2.4 liter motor is what is called an interference motor and this means it will bend valves if the timing belt breaks or jumps timing. You will need to have cylinder head removed and bent valves replaced if...
Question
What's the cost on a repair for a value seal replacement
Hello, thank you for writing in. The cost of replacing your valve seals is going to vary by the technicians available in your area, and the availability of parts. Unfortunately, accessing the valves can be very difficult and its can...
Question
clear/replace EGR valve
Hello, thank you for writing in. For exact specifications on tools needed and a step by step procedure, you will need to access a service manual for the vehicle. Typically you would expect to use a 12 mm socket or...
Question
Where is purge valve for evap canister 07 honda civic si
The purge valve is mounted on the engine and you will see hose connections from the valve to the intake manifold as well as a wire harness connection. The purge valve should be tested to determine if it is actually...
Question
Hello, I have a 2011 chevy Cruze that beds the valve cover replaced. I already have the part. Will you please email me a quote for
Hi, I will be glad to help you with this. If you already have a new cover, the required service is valve cover gasket replacement as that service already includes removal and re-installation of the existing valve cover and, in...
Question
Variable valve timing
The protocol depends on the codes that have set, which are quite varied. Problems with these systems on your particular model and year can stem from blocked oil passages to failed solenoids to wiring harness issues, not to mention mechanical...
Question
Tick in drivers side gets lower after warm up
In your initial question, I did not know that valve damage occurred as a consequence of a failed timing belt replacement. The 4 valves that the shop "claims" were damaged might merely represent what they "think" was the extent of...

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