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Author Topic: how do u test if an egr is bad? venomous99 ¯ Member # 1917 posted                              my fox is having a rough idle and low vacuum. im suspecting maybe the egr is bad. no check engine light. how do u properly test your egr to see if it is bad? thanks alex -------------------- MKII Q7 89LX Posts: 4811 | From: dc | Registered: Oct 2002  |  : 93grbrGT ¯ Member # 6655 posted                              Off car: Connect a vacuum gun( mityvac) to the vacuum nipple on the egr and pump it a couple of times. You will see the diaphram move and it shouldn't release the presure unless the diaphram is torn. Installed: Connect gun and pump while the vehicle is running. You should notice the idle drop/ engine running rough. If the idle stays the same, either the diaphram is bad or the egr passages are clogged. In your case it could be stuck open (clogged/bad egr solenoid). Good luck. [ October 29, 2006, 05:13 AM: Message edited by: 93grbrGT ] Posts: 165 | Registered: Mar 2006  |  :

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