External fuel pump
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
There is not a KOEO code 13.
Code 13 is only a KOER code.
Service Code 13 indicates that during Engine Running Self-Test, engine rpm could not be controlled within the Self-Test lower limit band.
Possible causes:
-- Improper idle air flow set.
-- Vacuum leaks.
-- Throttle linkage binding.
-- Throttle plates open.
-- Improper ignition timing (TFI vehicles only).
-- Throttle body/ISC solenoid contamination.
-- ISC circuit short to ground.
-- Damaged ISC solenoid.
Code 13 is only a KOER code.
Service Code 13 indicates that during Engine Running Self-Test, engine rpm could not be controlled within the Self-Test lower limit band.
Possible causes:
-- Improper idle air flow set.
-- Vacuum leaks.
-- Throttle linkage binding.
-- Throttle plates open.
-- Improper ignition timing (TFI vehicles only).
-- Throttle body/ISC solenoid contamination.
-- ISC circuit short to ground.
-- Damaged ISC solenoid.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
There is not a KOEO code 13.
Code 13 is only a KOER code.
Service Code 13 indicates that during Engine Running Self-Test, engine rpm could not be controlled within the Self-Test lower limit band.
Possible causes:
-- Improper idle air flow set.
-- Vacuum leaks.
-- Throttle linkage binding.
-- Throttle plates open.
-- Improper ignition timing (TFI vehicles only).
-- Throttle body/ISC solenoid contamination.
-- ISC circuit short to ground.
-- Damaged ISC solenoid.
Code 13 is only a KOER code.
Service Code 13 indicates that during Engine Running Self-Test, engine rpm could not be controlled within the Self-Test lower limit band.
Possible causes:
-- Improper idle air flow set.
-- Vacuum leaks.
-- Throttle linkage binding.
-- Throttle plates open.
-- Improper ignition timing (TFI vehicles only).
-- Throttle body/ISC solenoid contamination.
-- ISC circuit short to ground.
-- Damaged ISC solenoid.
"KOER Coeds = 41 HO2S System Lean Bank 1
= 34 EVP Sensor Above Threshold
= 13 Cannot Control RPM During Self-Test Low RPM Check"
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
I can tell you've got a lot of experience with the the 90s-gen stuff, Bill(?). 
The first year of a CEL (MIL new name HA) connected to a computer is 1988, he doesn't have such a dash light to light up, so deciding to pull codes was on an as-needed basis as it started to run bad (or not start).
The first year of a CEL (MIL new name HA) connected to a computer is 1988, he doesn't have such a dash light to light up, so deciding to pull codes was on an as-needed basis as it started to run bad (or not start).
Thread Starter
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Senior User
Joined: Apr 2012
Posts: 452
Likes: 0
Hi Vincent!
You had sent those instructions to me before and I followed them. Since that time, the trucks never run better. However, After following the instructions I sent the idle speed at 650. The codes are telling me that's too high and I will readjust.
Have some other things to fix. I wonder if they are related to the IAC wiring problem. Wuill work on some of those things tomorrow, starting with the idle speed.
Beyond that, waiting for the diode to arrive so I can fix the wiring to the IAC. Will likely need some direction there. I'll let you know.
You've been great! Thanks for the help!!
You had sent those instructions to me before and I followed them. Since that time, the trucks never run better. However, After following the instructions I sent the idle speed at 650. The codes are telling me that's too high and I will readjust.
Have some other things to fix. I wonder if they are related to the IAC wiring problem. Wuill work on some of those things tomorrow, starting with the idle speed.
Beyond that, waiting for the diode to arrive so I can fix the wiring to the IAC. Will likely need some direction there. I'll let you know.
You've been great! Thanks for the help!!
This story gets better and better every day….. Good job following that wire back….. We will make a Tech out of you by next year.
KOEO – Code 11 means you truck passed the KOEO Self-Test, this is required before moving on the KOER troubleshooting.
KOEO – Code 13; Follow this procedure to clear this code; (your idle is set to high)
5.0L V8: 1985 Truck and Van; To adjust idle speed: (Official Procedure)
1. Disconnect the battery for 3 minutes to erase the current idle control program from ECA memory. Turn the throttle stop screw in (clockwise) 1 turn.
2. Reconnect the battery, start the engine, and run it at 1800 rpm for 30 seconds.
3. Place the transmission in drive (AT) or neutral (MT) and let idle speed stabilize.
4. Back out the throttle stop screw, until idle speed is 600 ±20 (AT). Then back out the screw another 1/2 turn.
5. Stop the engine and disconnect the battery for at least 3 minutes.
6. To check curb idle speed, start the engine and run it at 1800 rpm for 30 seconds. Place the transmission in drive (AT) or neutral (MT) and let idle speed stabilize. Refer to the VECI decal for curb idle specifications.
So, I have done this 12 times, this is not easy, easier with 2 people.
Print these instructions out, 2 sets if you have 2 people. Easier to use a Diagnostic Tachometer, $30, unless you have one.
Easier to count the turns with a long straight slot screwdriver. You will need the stopwatch function on your phone to time the 30 seconds. It is challenging to keep your foot on the peddle steady @ 1800 rpm. Do not start the clock until you are steady @ 1800 rpm. (Practice this first before you follow the procedure).
If you only have one person, you will have to set your parking break, and block your wheels. I recommend you use reverse instead of drive (step 3), so you don’t get run over, works just as well.
Please ask questions. I have cleared code 13 using this procedure.
Ref; http://beta.askatech.com/AskATechLiv...Track/F050.pdf
KOEO – Code 11 means you truck passed the KOEO Self-Test, this is required before moving on the KOER troubleshooting.
KOEO – Code 13; Follow this procedure to clear this code; (your idle is set to high)
5.0L V8: 1985 Truck and Van; To adjust idle speed: (Official Procedure)
1. Disconnect the battery for 3 minutes to erase the current idle control program from ECA memory. Turn the throttle stop screw in (clockwise) 1 turn.
2. Reconnect the battery, start the engine, and run it at 1800 rpm for 30 seconds.
3. Place the transmission in drive (AT) or neutral (MT) and let idle speed stabilize.
4. Back out the throttle stop screw, until idle speed is 600 ±20 (AT). Then back out the screw another 1/2 turn.
5. Stop the engine and disconnect the battery for at least 3 minutes.
6. To check curb idle speed, start the engine and run it at 1800 rpm for 30 seconds. Place the transmission in drive (AT) or neutral (MT) and let idle speed stabilize. Refer to the VECI decal for curb idle specifications.
So, I have done this 12 times, this is not easy, easier with 2 people.
Print these instructions out, 2 sets if you have 2 people. Easier to use a Diagnostic Tachometer, $30, unless you have one.
Easier to count the turns with a long straight slot screwdriver. You will need the stopwatch function on your phone to time the 30 seconds. It is challenging to keep your foot on the peddle steady @ 1800 rpm. Do not start the clock until you are steady @ 1800 rpm. (Practice this first before you follow the procedure).
If you only have one person, you will have to set your parking break, and block your wheels. I recommend you use reverse instead of drive (step 3), so you don’t get run over, works just as well.
Please ask questions. I have cleared code 13 using this procedure.
Ref; http://beta.askatech.com/AskATechLiv...Track/F050.pdf
Thread Starter
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Senior User
Joined: Apr 2012
Posts: 452
Likes: 0
New, but I want to check the voltage going to it, tomorrow.
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Thread Starter
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Senior User
Joined: Apr 2012
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Yes, but I'm sure it's fouled due to the poor running when the fuel pump issues come into play.
Thread Starter
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Senior User
Joined: Apr 2012
Posts: 452
Likes: 0
I did have a vacuum leak that is now fixed. I'll see if it will code a 13 tomorrow. I think it won't, but we'll see.
There is not a KOEO code 13.
Code 13 is only a KOER code.
Service Code 13 indicates that during Engine Running Self-Test, engine rpm could not be controlled within the Self-Test lower limit band.
Possible causes:
-- Improper idle air flow set.
-- Vacuum leaks.
-- Throttle linkage binding.
-- Throttle plates open.
-- Improper ignition timing (TFI vehicles only).
-- Throttle body/ISC solenoid contamination.
-- ISC circuit short to ground.
-- Damaged ISC solenoid.
Code 13 is only a KOER code.
Service Code 13 indicates that during Engine Running Self-Test, engine rpm could not be controlled within the Self-Test lower limit band.
Possible causes:
-- Improper idle air flow set.
-- Vacuum leaks.
-- Throttle linkage binding.
-- Throttle plates open.
-- Improper ignition timing (TFI vehicles only).
-- Throttle body/ISC solenoid contamination.
-- ISC circuit short to ground.
-- Damaged ISC solenoid.
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
OIC, thanks for explaining; ND Bill does the exact same thing sometimes.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
So, KOER Code 41 may mean that your O2 Sensor is reporting a Lean mixture, so less than about 0.4 vdc or less going to the ECA. When everything is perfect, the sensor sends about 0.5 vdc to the ECA. (Range is 0 to 1 vdc) 0 to 0.4 vdc=Lean mixture / 0.6 to 1.0 vdc=Rich mixture
This is a single wire Sensor. It uses the exhaust pipe as its ground path, so check continuity between the Exhaust Pipe and the body or engine ground. (Rx200) Record measurement. If you don’t get a good ground, add a wire strap from the Body or Engine to O2 side of the “Y” pipe. So, maybe the Nut side of the “Y” pipe before the Exhaust Manifold.
Check the wire and connection to the O2 sensor.
If everything above checks out, replace your O2 Sensor, (RockAuto has one with the connector attached, $9), Personally, I only use OEM or high quality sensors. (not sure about this since yours is newish)
If you decide to replace this O2, start spraying it with PB Blaster 6 days in a row before attempting to remove it. It might break off. Super hard to get to if yours is in the middle of the “Y” pipe.
Basically this lean condition causes your engine to run rich, because the computer is allowing more fuel into your intake than necessary. This can affect your idle as well.
Last edited by vjsimone; Jul 17, 2016 at 10:50 PM. Reason: Adding text
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Hi Vincent!
You had sent those instructions to me before and I followed them. Since that time, the trucks never run better. However, After following the instructions I sent the idle speed at 650. The codes are telling me that's too high and I will readjust.
Have some other things to fix. I wonder if they are related to the IAC wiring problem. Wuill work on some of those things tomorrow, starting with the idle speed.
Beyond that, waiting for the diode to arrive so I can fix the wiring to the IAC. Will likely need some direction there. I'll let you know.
You've been great! Thanks for the help!!
You had sent those instructions to me before and I followed them. Since that time, the trucks never run better. However, After following the instructions I sent the idle speed at 650. The codes are telling me that's too high and I will readjust.
Have some other things to fix. I wonder if they are related to the IAC wiring problem. Wuill work on some of those things tomorrow, starting with the idle speed.
Beyond that, waiting for the diode to arrive so I can fix the wiring to the IAC. Will likely need some direction there. I'll let you know.
You've been great! Thanks for the help!!
Set Idle to 600rpm in reverse or drive, Then back out the screw another 1/2 turn.
This will take your idle down to about 550rpm, thats ok.
Last edited by vjsimone; Jul 17, 2016 at 11:11 PM. Reason: Modify text