Code 33
Fleet Owner
Joined: Oct 2005
Posts: 20,789
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From: Kentucky
Code 34 means the signal output from the EVP is above 0.67V when the EGR is closed. That can be caused by a faulty EGR valve (yes I know you stated you swapped in another, but it could be bad) or the EVP sensor is bad. If the EGR valve is used then you could have a build up of carbon on the pintle seat. That will keep it slight open which in turn triggers Code 34. Once again, it's a process of elimination and diagnosing the root cause.
Fleet Owner
Joined: Oct 2005
Posts: 20,789
Likes: 1,753
From: Kentucky
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
When you replaced the EGR valve, did you use your old EVP sensor or one that came on on the"new" one?
There are different EVP sensors between years. I did have that code 34 but when I replaced the EVP for that year truck it went away.
Another issue that can cause code 34 after EGR valve replacement is the O ring for the EVP sensor to seal onto the EGR valve is missing or doubled up O rings installed. I forgot which post that someone found out about that here.
There are different EVP sensors between years. I did have that code 34 but when I replaced the EVP for that year truck it went away.
Another issue that can cause code 34 after EGR valve replacement is the O ring for the EVP sensor to seal onto the EGR valve is missing or doubled up O rings installed. I forgot which post that someone found out about that here.
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Cargo Master
Joined: Jan 2012
Posts: 2,304
Likes: 4
From: boonville ny
I left the original sensor top on. I can try the other one and see if it makes a difference. Unlesss new egr valves dont come with new sensors and this could be the original from my 87. It was a mechanic that replaced the valve. The o ring i know is there
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johnnyfoodstamp
1987 - 1996 F150 & Larger F-Series Trucks
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Oct 2, 2018 07:53 AM
