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Author Topic: KOER 41,91,33  (Read 10381 times)
wickedstangs
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« on: August 16, 2011, 11:42:29 pm »
Hello Everyone,
Just picked up a 1990 Mustang LX 5.0 and ran the KOER Test and got codes 41,91,33.






I was following your procedures for the 02 Sensor Codes and found the ground wire #19 H.E.G.O Sensor Ground connected to my EGR mount.?  Question is this alright for a ground location? Shouldn't it be located on Chassis Ground the Body?

 

Any info would be greatly appreciated..
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Joel5.0
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« Reply #1 on: August 17, 2011, 09:33:56 am »
Is it optimum?.... nope, but as long as a max resistance to ground of <5 ohms is maintained it will work fine. Check resistance at pin 49 in the EEC connector, EEC disconnected, to battery (-) terminal. LUK
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wickedstangs
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« Reply #2 on: August 17, 2011, 04:15:24 pm »
Quote from: Joel5.0 on August 17, 2011, 09:33:56 am
Is it optimum?.... nope, but as long as a max resistance to ground of <5 ohms is maintained it will work fine. Check resistance at pin 49 in the EEC connector, EEC disconnected, to battery (-) terminal. LUK

When I go to pins 49 and to the #19 its a short less then <5ohms
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wickedstangs
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« Reply #3 on: August 17, 2011, 04:49:24 pm »
Here are my readings... It went from 20Megs down to the below...

* SDC10090.JPG (4843.45 KB, 2736x3648 - viewed 1973 times.)

* SDC10091.JPG (5067.16 KB, 3648x2736 - viewed 597 times.)
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wickedstangs
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« Reply #4 on: August 17, 2011, 05:19:15 pm »
Was going to change out the fuel pump and Fuel due to rough idle...

Read the below also...

* fuel.jpg (66.34 KB, 556x620 - viewed 543 times.)
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« Reply #5 on: August 17, 2011, 05:40:40 pm »
One Code Down.... TWO to go..

Replaced the EVR and my code 33 went away..Smiley
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« Reply #6 on: August 17, 2011, 05:44:07 pm »
You have an open HEGO ground condition with that 2.29 Mega-ohms reading to ground, it should be <5 ohms.

regarding the fuel pressure.... what is the pressure output engine idling? If its 35-45 psi, you do not need to replace the fuel pump. LUK
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LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
wickedstangs
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« Reply #7 on: August 17, 2011, 06:04:58 pm »
Went back to check it again and this is what I got..

* SDC10090.JPG (4901.53 KB, 2736x3648 - viewed 573 times.)
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wickedstangs
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« Reply #8 on: August 17, 2011, 06:12:56 pm »
Quote from: Joel5.0 on August 17, 2011, 05:44:07 pm
You have an open HEGO ground condition with that 2.29 Mega-ohms reading to ground, it should be <5 ohms.

Do you have a wiring diagram for the ground wire? Does it go to the right and left of the O2 sensors?
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wickedstangs
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« Reply #9 on: August 17, 2011, 06:26:16 pm »
Joel
You said:
Quote
Check resistance at pin 49 in the EEC connector, EEC disconnected, to battery (-) terminal.

what does that do?

According to the image below.. The HEGO Ground is pin 49 coming from the EEC Connector? Which was below the <5ohms checking from pin 49 to the HEGO ground located next to my EGR. 

I am not understanding.. And thank you so much for your help really appreciate it...

* HEGO.jpg (90.47 KB, 537x556 - viewed 794 times.)
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Joel5.0
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« Reply #10 on: August 17, 2011, 08:33:01 pm »
Quote from: wickedstangs on August 17, 2011, 06:26:16 pm
Joel
You said:
Quote
Check resistance at pin 49 in the EEC connector, EEC disconnected, to battery (-) terminal.

what does that do?

According to the image below.. The HEGO Ground is pin 49 coming from the EEC Connector? Which was below the <5ohms checking from pin 49 to the HEGO ground located next to my EGR. 

I am not understanding.. And thank you so much for your help really appreciate it...


Nope.... you show a 2.29 MΩ reading as in 2.29 millions of ohms or, a very high resistance or open condition. Again.... pins 49, 20, 40, 60 at the ECC connector are grounds, and they should show a very low resistance (<5ohms) in order to ID them as "grounded" or "shorted to ground". In your case, pin 49 (provided you are checking pin 49 for sure).... shows and open condition since its value is above 0.1 MΩ or 10KΩ.

See the "M" between the 2.29 and the "Ω" below?



IOW... there is an open between pin 49 and ground. LUK
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ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
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« Reply #11 on: August 17, 2011, 09:05:58 pm »
A "short" (complete wire pathway) resistance reading is very close to zero ohms.

An "open" circuit (broken wire) resistance readings are very large ohm readings.
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wickedstangs
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« Reply #12 on: August 17, 2011, 09:28:16 pm »
Alright problem solved..

This was my issue..



That wire which is electronically the same as Pin 49 I measure from the above image to the - terminal on the battery and it was reading the same as Pin 49 from the EEC above.. I removed that connection on EGR and placed it in the right location and both codes are gone..  Now I only have one code 94...   Thank you everyone... 
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Joel5.0
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« Reply #13 on: August 17, 2011, 09:32:38 pm »
Code 94 is a KOER thermactor system code. It will not light up the SES indicator or cause any driveability issues. By The Way.... it may be caused by a carbon clogged banjo tube (the one that connects to the back of the cylinder heads). LUK
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ACRONYMS:
LUK  LMK  JIC  BTSTDTRT  YCYDYP  NFI-YTM  SPOBI, and the classic... DILLIGAS

'86 Mustang GT, X-303 cam, Holley DP 700, RG Tran., 289 Heads   Ford Smilie 2


Quote from: Joel5.0
The right to be stupid is inalienable for sure however, there is no such thing as a right to impose stupidity onto others
Great Thoughts will Overwhelm a Feeble Mind
There is never money to do it right, but there's always money to do it over.
Knowledge based on external evidence is unreliable.
He, who doesn't ask, does not deserve an answer.
A mind is like a parachute it only works when it is open.  (oldmanjoe)
If you can't explain it simply, you don't understand it well enough. (Albert Einstein)
Tuning on a Dyno for the track, is like swim practice in a bathtub.
I can explain it for you, but I can't understand it for you. (90lxcoupe)
The proof of understanding is the ability to explain it. (H. Torruella)
Ignorance is bliss, but stupidity is orgasmic.
Fraud and falsehood only dread examination. Truth invites it. (Samuel Johnson)
The chaotic resistance of the opponents leads to the conclusion that they are not prepared to meet the challenge. The problem is already much more psychological then technological. [Bojidar Djordjev]
Individuals are rational and humane... Crowds are reactionary and barbaric. (Jason)
The person who says it cannot be done should not interrupt the person doing it. –Chinese Proverb
Nothing sways the stupid more than arguments they can't understand - Cardinal de Retz
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