Finding an intermittent
Finding an intermittent problem is probably the most frustrating thing we do. And because of that, it's also probably the problem that get's the most parts "thrown" at it. Remember this. The intermittent problem does have a cause. All we have to do is stop guessing and look for evidence. Follow the evidence and it will lead you to the problem.
GM EVAP Vent Solenoid Testing
2002 Chevy Silverado 4.8L with a P0449 EVAP Vent Solenoid trouble code. For more info. see www.autocomputerstroubleshooting.com
Automotive Repair: Diagnosing EVAP Systems, The Trainer, June 2011
http://workshop.search-autoparts.com Diagnosing "Check Engine" light complaints is a common task for most shops. And a leading cause of an illuminated MIL (Malfunction Indicator Lamp) is a fault in the evaporative emissions system.
The primary function of the evaporative emissions system (also called the EVAP system) is to prevent fuel vapors in the tank from being released to the atmosphere. Instead, the vapors are collected in an activated charcoal storage tank, or canister. The ECM controls the purge of the canister by opening or closing a solenoid valve connecting the canister to the intake manifold of the engine, and allows the stored vapors to be fed and burned in the engine.
The EVAP system is tested by the ECM to make sure all the components function as they are supposed to, and checks the system for leaks to the atmosphere. A pair of EVAP related codes on Pete's 2007 Toyota, and how he approached their diagnosis, is the topic of June's "The Trainer". Click this link to subscribe to Motor Age! http://bit.ly/MA_YT_freesub
Finding Engine Vacuum Leaks With A Cigar
Scotty Kilmer, mechanic for the last 43 years, shows how you can find engine vacuum leaks in your vehicle using cigar smoke. It really works as well as a thousand dollar smoke machine.
Clear check engine light for less than 5 dollars
More Tutorials on my CHANNEL: http://www.youtube.com/user/moccina
*This video is an EXPERIMENT I wanted to try on my car, and is for INFORMATIONAL purposes ONLY. This fix is for off-road use. The content shown in this video is not intended to encourage emissions test cheating. I enjoy the process of testing theory because you always learn something new, regardless of the outcome.
Using a spark plug defouler kit, I install a "buffer" in between the downstream oxygen sensor and the catalytic converter. Quite often, frustrated car owners get the P0420 code for reasons other than a bad cat. I have heard of people getting the code just because they removed the converter and reinstalled it. It can also happen if you run your vehicle out of gas etc... etc...
It is also common for car owners to get the P0420 code, replace the converter, and both o2 sensors-- only to have the code come back after 1000 miles or so. This can be a very frustrating, time consuming and of course-- expensive venture. Here is one way to resolve the issue. Good luck and have fun!
Evaporative Emissions Check Engine Light
A video that may help others to pass an MVD Emissions inspection. The video contains information about OBD2 data codes and explains in part, the evaporative emissions system in today's automobile
Wells EVAP Training with Sgt. Tech. P0440, P0441, P0442 etc.
http://www.wellsve.com/ This video demonstrates how a typical EVAP system functions. P0440, P0441, P0442, P0456, P0457, P0455, P0443, P0446, P0449, P0450, P0451, P0452, P0453, P0496 trouble codes with explanations and possible causes. Why Wells fuel tank pressure sensors are rated the best.
"The information presented in this program is based on a specific diagnostic case and might not directly apply to the vehicle you are repairing. We do not represent or warrant that the information presented is complete or error free. Please take all safety precautions. We disclaim any and all liability for losses, injuries or damages in connection with your repair."
DIY EVAP Canister Purge Control Valve BMW
In this video i will show you how to replace the purge control valve on your e46 BMW, this will fix the dreaded P0444 code that comes up, this is a common problem with the BMW cars and is a easy fix