Ran Codes on my 91 GT and got only 10, 11, and 85?

91StangGT5.0

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Oct 21, 2009

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Mar 13, 2010

#1

• Mar 13, 2010

• #1

I ran codes today on my mustang gt with a digital code reader (obd1) and did both KOEO and KOER and only came up with codes in KOEO...Codes 10 (Don't know), 11 (System Ok), and 85 (Either 3/4, 4/3 Shift Solenoid or Canister Purge Solenoid Failure). I'm trying to figure these out sense my car idle surges when in park after it's been warmed up. It will only surge maybe 100-200 rpms sometimes 300 rpms from 600ish - 950 ish.

No Check Engine Light either....

 

SpartaPerformance

10 Year Member

Nov 5, 2006

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Long Island NY

Mar 13, 2010

#2

• Mar 13, 2010

• #2

There is no code 10, they start at 11 which means system pass, I'ld disconnect the battery for atleast 5 minutes then run codes again perhaps you getting digits mixed up.

 

91StangGT5.0

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Oct 21, 2009

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Mar 14, 2010

#3

• Mar 14, 2010

• #3

Nope definitely not getting codes mixed up. I'm staring at a screen that reads them out digitally. Says 10, 11, and 85

 

91StangGT5.0

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Oct 21, 2009

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Mar 14, 2010

#4

• Mar 14, 2010

• #4

The code 85 came up as an "O" so by reading the book the reader came with it's for koeo

 

91StangGT5.0

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Oct 21, 2009

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Mar 14, 2010

#5

• Mar 14, 2010

• #5

I ran KOEO codes again and came up with 85(O) 10 (Code Spacer) and 33 (C). I looked up 33 and it's EGR Valve Not Opening Properly. I don't reckon I have it even wired up as the vacuum line going from the EGR Valve is not hooked up or capped off.

 

liljoe07

5 Year Member

Feb 18, 2009

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Cartersville,Ga

Mar 14, 2010

#6

• Mar 14, 2010

• #6

You are right. There is a code 10, its a seperater code. Everything after this code are memory codes.

Run the codes with the engine running. If the EGR vacuum line is disconnected, then code 33 will flash.

 

91StangGT5.0

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Oct 21, 2009

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Mar 14, 2010

#7

• Mar 14, 2010

• #7

I've tried with the engine running and get nothing. I've also noticed that the vapor line that runs along the pass. fender isn't connected on the front end to anything.

Charcoal Canister Vapor Line


Where EGR Valve Vac Line Runs To.


Manifold Vac Line with Screw in it.


Where Manifold Vac Line Runs from (Behind Intake Manifold)