code 67
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Joined: May 2004
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code 67
hey there,
i'm new here so please bear with me. I'm getting a code 67 in the KOEO test. The book says it's a neutral pressure switch malfunction. Where is this switch and what does it do? How would I go about testing it? The truck is an '86 ranger 2.9, manual trans, stripped model with a utility bed. Occasionaly it bucks on acceleration and has a constant muffled backfire under deceleration (sounds like a coffemaker running out of water). I have replaced the idle air valve, egr,egr position sensor, egr vacuum control valve and 02 sensor. I get an 11 on the continuous memory and have not run the timing or KOER because of the 67 code. Any help is greatly appreciated as I am trying to smog this thing in Ca.
Thanks, Chris
i'm new here so please bear with me. I'm getting a code 67 in the KOEO test. The book says it's a neutral pressure switch malfunction. Where is this switch and what does it do? How would I go about testing it? The truck is an '86 ranger 2.9, manual trans, stripped model with a utility bed. Occasionaly it bucks on acceleration and has a constant muffled backfire under deceleration (sounds like a coffemaker running out of water). I have replaced the idle air valve, egr,egr position sensor, egr vacuum control valve and 02 sensor. I get an 11 on the continuous memory and have not run the timing or KOER because of the 67 code. Any help is greatly appreciated as I am trying to smog this thing in Ca.
Thanks, Chris
Postmaster
Joined: Oct 2003
Posts: 4,516
Likes: 1
From: SoCal
Iwould'nt worry about the 67 for now. The popping while coasting does sound like retarded ignition timing. Warm the engine up, remove the spout connector & check for 10 degrees BTDC with your timing light.
Last edited by 87 XLT; May 2, 2004 at 01:26 PM.
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New User
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The 67 went away after it warmed up. I ran the timing check-it's O.K. then the KOEO and got a 25 code-knock sensor. Would a faulty knock sensor put the computer in some kind of default or "limp home" mode thereby causing the popping under deceleration?
Post Fiend
Joined: Dec 2001
Posts: 10,562
Likes: 4
From: South Jersey
A faulty sensor will cause the ECU to use a default value. A bad KS would most likely cause retarded timing, loss of power or pinging.
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Thanks everyone for your help. This is a great site and a great source of information.
Thanks again,
Chris
Thanks again,
Chris
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