evp codes
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New User
Joined: Jan 2010
Posts: 13
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evp codes
I have been having alot of idle and drivability problems with my 93 5.0,it wants to idle too high at times and other times the idle surges up and down,and also when it shifts into drive or o.d it bogs down,before finally picking up and going on, I have noticed this more lately even when i just let of the gas when I go back,there is a stumble or hesitation...I pulled the codes via self test,and all it had was 327,328...Could the evp cause these problems?please help!
Fleet Owner
Joined: Oct 2005
Posts: 20,783
Likes: 1,751
From: Kentucky
The EVP is the position feedback of the EGR valve. With the issues you have and codes I would suspect a problem with the EGR valve itself. A weak diaphragm or collapsed internal spring on the EGR valve can cause vacuum leaks. A good visual inspection is in order.
