Tip & How-To about Kia Rio

How to check PCV valve

The easy way to check your PCV valve . have the engine at an idle .pinch the vacuum coming from the vavle. every time you pinch it you should here a click and when you unpinch the line you should here a click. do this several times to make sure the valve is operating smoothly. click click, click ,click.your valve is good .

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Honda crx with auto transmission idles roughly in drive or reverse. AC on makes it worse.what can cause this?

Idle Speech There are a lot of things that can contribute to an idle issue on your Honda. In fact, in the end it may still be there to some degree because of the nature of a 4 cylinder engine. 4 cylinder engines fire every 180? of crank shaft rotation. Because of this, the crank spends a LOT of time in rotation before the next power stroke. This creates a 'choppy' power delivery that may be most noticeable at idle. So if you have a rough idle with your 4 cylinder Honda, this might be a contributing factor to your rough idle.
The first step I take to solve a rough idle issue is to start with a good tune up. Use NGK or Nippon Denso plugs only in your Honda. Don't change the wires if they're OE (Original Equipment). Honda wires last just about forever so if you still have them on your engine, leave them be unless they show signs of external damage. If you feel you need to change the ignition wires and you want to save a couple of bucks, you might consider NGK wires as they are very good and less expensive than OE. They also come in a snappy blue color! A quality cap and rotor should also be used. I often go with Beck Arnley if I want to save a couple of bucks. Once again, OE is best for these parts. Honda's are VERY picky about the parts you use on their ignition systems. You'd be surprised at the difference between OE parts and aftermarket parts when it comes to Honda ignition systems. Trust me, I've seen plenty of issues here which is why I mention it. I've solved more than one idle issue just with a basic tune up using Honda parts. Lastly, a new air filter is a good idea to add to your list of tune up parts....heck the oil. You'd be amazed at how often I find low oil in an engine. If your Honda is low on oil the engine will have to work harder and possibly run rough as a result. I think it's also important to note here that you need to use the proper viscosity when putting oil in your Honda engine. DO NOT stray from the factory recommendations here. You may think it's a good idea to put thicker oil in your Honda engine, but the truth is that if you do that you can actually starve the top end by doing so. During start up, your engine is almost dry of oil. If you use thicker oil it will take longer for the oil to reach the top end of the engine. Because of this, the cam and valve train do not get oil for some time during start up. When this happens, the parts wear faster and eventually cause things like rough idles.
Don't change the PCV valve unless it's broken or aftermarket. If you see an aftermarket PCV valve, exchange it for an OE valve. Believe it or not, I've seen idle issues caused by aftermarket PCV valves on Honda's. The OE PCV valves last just about forever so you can easily justify the expense. I will admit however that the OE valves sometimes come apart internally and cause idle problems. If that's the case, it creates a large vacuum leak. When this happens, it effects the idle as well as fuel economy. Usually if the PCV valve fails in this manner, you'll experience a 'high' or 'hunting' idle. An easy way to find one of these faulty PCV valves is to pinch off the supply line to the PCV valve with a pair of pliers while the engine is at idle. If the idle smoothes out when you do this, replace the PCV valve with an OE unit.

Sep 28, 2016 | Honda Cars & Trucks

2 Answers

Good Day, my Corsa is got a high Idling and replaced all sensors on intake and throttle. Still Idling high and workshop light came on. What can the problem be. Please assist me - Thank you.

The cause of high idle are vacuum leaks or a bad or dirty Idle air control. Check pcv valve to see if its working properly. pinch off the hose that supplies the PCV valve. The engine speed should drop slightly. If the engine returns to a normal idle speed, the PCV valve should be replaced. The Idle air control regulates engine rpms.

May 14, 2016 | 2006 Opel Corsa Utility

1 Answer

My car dies as soon as my food is off the gas

sound like idle speed control problems, if you see check engine flashing code scan for faulty idle air control valve or faulty egr valve which sticking open, if all is good check see if you vacuum leak at pcv valve or pcv valve hose check see if pcv getting vacuum and see if pcv valve rattle if shaken if not pcv valve faulty.

Jan 07, 2012 | 1995 Dodge Dakota

1 Answer

2003 Ford Ranger 2.3 Diagram

 rough-idling engine can signal a number of positive crankcase ventilation (PCV) valve problems, such as a clogged valve or a plugged hose. But before beginning the functional checks, double check the PCV valve part number to make certain the correct valve is installed. If the correct valve is being used, continue by disconnecting the PCV valve from the valve cover, intake manifold, or hose. Start the engine and let it run at idle. If the PCV valve is not clogged, a hissing is heard as air passes through the valve. Place a finger over the end of the valve to check for vacuum.


With the engine at idle, vacuum should be felt at the PCV valve. 


Jan 19, 2009 | 2003 Ford Ranger Regular Cab

1 Answer

ford escort

Guess what? This might be easy.
Escorts have a common problem, (so do a lot of cars), with PCV hoses that get mushy. The tube that connects the PCV comes from the top of the engine, off a vacuum tree at the rear (passenger compartment side). It starts out with a rubber elbow that connects to a plastic tube. This goes toward the front of the engine, over the top. Follow this tube to the front of the engine. At the end is the PCV , (PCV stands for 'positive crankcase ventilation' ), valve. Frequently the rubber elbow deteriorates until it allows a vacuum leak. This loss of vacuum messes up fuel and idle control but is not much of a factor above idle. To find a vacuum leak that is not obvious, with the engine idling, spray carburator cleaner around the intake and vacuum hoses, a bit at a time. If a significant leak exists, engine idle will change or the engine will smooth out. Pinpoint the leak.
If no leak can be found, the IAC, (idle air control valve), could be the problem. Can you get the engine to run okay by opening the throttle slightly? When you do this you are doing what the IAC is supposed to do. If you suspect the IAC, go buy one and put it on yourself. it is easy to replace and you can get one for about the same as the cost of professional diagnosis. If that does not fix the problem, then at least you have eliminated that and you have a new part! For more tips like this, check out my site, trustywrench.com. Good Luck!

Nov 12, 2008 | 1998 Ford Escort

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