To make sure this tutorial applies to your specific vehicle check this section out first. The vehicle computer operates the valve instead of previous years egr valves which are operated by the engine vacuum.
Part 1 How To Test The Gm Egr Valve Buick Chevy Olds Pontiac
Gm egr valve wiring diagram. Identifying the egr valve. With the egr valve unplugged it ran smoother. Electronic egr valves are used in vehicles dated 1990 and up. I asked a mechanic about it and he suggested i unplug the egr to see if i noticed any difference. In this video i show another variable when it comes to testing this type of egr valve. How to test a 5 wire electronic egr valve.
After miles of service the exhaust gas recirculation egr systemespecially the egr valvewill lead to engine performance problems due to carbon buildup components mechanical problems or vacuum hose leaks. Sign up today to access the guides. This reduces nox emissions and helps prevent pinging detonation the egr valve is closed at idle. In particular the 5 wire linear egr valve used on many different gm vehicles. Learning how to test an egr valve will save you time money and some headaches. How the pcm tests the egr.
How to determine egr solenoid polarity with a wiring diagram. Open 5v reference circuit from a bad engine computer ill also show you how i repaired this problem without. The testing procedures shown in this video apply to all electronic style egr systems. The exhaust gas recirculation valve within your vehicle is a crucial component in reducing harmful emissions and ensuring your vehicle runs smoothly. Finally this week the misfires were more noticeable and it set codes. The egr valve thats covered by this article are for 31l 34l and 35l gm vehicles from 2000 to 2009 models years although some late 1999 models use this type of egr valve too.
The egr valve in photo 4 of 4 with the green check mark is the one covered by this article. In particular the 5 wire linear egr valve used on many different gm vehicles. On throttle application the egr valve will be commanded open by the pcm as needed. The car being tested has a 3100. Egr valve test 2000 2009. The egr valve in photo 3 of 4 with the red x is not covered by this article and is tested differently.
The egr system allows exhaust gas to be introduced into the intake stream in order to cool combustion chamber temperatures under load. P0300 random misfire and p0405 egr circuit. Learn how to access vehicle repair guides and diagrams through autozone rewards. The car being tested has a 3100 engine in it. From a search on the egr others suggested trying to clean it. How to determine egr solenoid polarity with a voltmeter.
How to check the egr passages for a restriction. If you need the egr valve test for the egr valve marked with the x you can find it here.
Gallery of Gm Egr Valve Wiring Diagram
