External fuel pump
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Two issues, one more troubling -
1. The wire connecting directly to the O2 sensor was disconnected from the top. I will have to replace the sensor. 2. I then connected to the O2 sensor connector (ECM side) to check continuity. Got a 1. I checked it several times to ensure correct pin and ground. Crap!
1. The wire connecting directly to the O2 sensor was disconnected from the top. I will have to replace the sensor. 2. I then connected to the O2 sensor connector (ECM side) to check continuity. Got a 1. I checked it several times to ensure correct pin and ground. Crap!
Well that would check the ground between the base and the pipe, but not check the wire to the ECA.
Anytime you remove the ECA connector, it is a good idea to disconnect one side of the Battery, for continuity checks, I would remove the Pos batt terminal.
I would not spray any chemicals on the O2 sensor.
Anytime you remove the ECA connector, it is a good idea to disconnect one side of the Battery, for continuity checks, I would remove the Pos batt terminal.
I would not spray any chemicals on the O2 sensor.
Cargo Master
Joined: Jun 2013
Posts: 3,176
Likes: 15
From: Somewhere n North America
Two issues, one more troubling -
1. The wire connecting directly to the O2 sensor was disconnected from the top. I will have to replace the sensor. 2. I then connected to the O2 sensor connector (ECM side) to check continuity. Got a 1. I checked it several times to ensure correct pin and ground. Crap!
1. The wire connecting directly to the O2 sensor was disconnected from the top. I will have to replace the sensor. 2. I then connected to the O2 sensor connector (ECM side) to check continuity. Got a 1. I checked it several times to ensure correct pin and ground. Crap!
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Senior User
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Yes, connector 29. I will work my way back down the wire working toward the ECM until I find connectivity. Right?
Cargo Master
Joined: Jun 2013
Posts: 3,176
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From: Somewhere n North America
Do you think the EVP is old or new?
Do you have a Code 34 or 31 ?
The EGR does not open at Idle, only during normal acceleration.
You should be able to feel vacuum during acceleration.
Do you have a vacuum gage?
After you clear the 30’s codes, you can make a gasket, and block the hole between the EGR and Intake.
Do you have a Code 34 or 31 ?
The EGR does not open at Idle, only during normal acceleration.
You should be able to feel vacuum during acceleration.
Do you have a vacuum gage?
After you clear the 30’s codes, you can make a gasket, and block the hole between the EGR and Intake.
Do you think the EVP is old or new?
Do you have a Code 34 or 31 ?
The EGR does not open at Idle, only during normal acceleration.
You should be able to feel vacuum during acceleration.
Do you have a vacuum gage?
Cargo Master
Joined: Jun 2013
Posts: 3,176
Likes: 15
From: Somewhere n North America
Sounds good.....
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EVP is new. I have a code 34.
Fleet Owner
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From: Easton,Ks
Do you have one for the 1985 computer?
Cargo Master
Joined: Jun 2013
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From: Somewhere n North America
You will need to monitor the vacuum reading at your EGR vacuum connection, during the KOER Self-Test. (Put a vacuum "T" in near the ERG.) Take notes.
During the test the ECA turns on the EGR Solenoid to allow vacuum to flow and open the EGR. The ECA expects to see a drop in RPM due to the exhaust gas mixing with the intake gas. If the EGR does not open, this Idle drop does not happen, so a Code 34 is reported.
Your EGR may not be opening during Self-Test.
Your engine must be fully warmed up when performing the KOER Self-Test.
During the test the ECA turns on the EGR Solenoid to allow vacuum to flow and open the EGR. The ECA expects to see a drop in RPM due to the exhaust gas mixing with the intake gas. If the EGR does not open, this Idle drop does not happen, so a Code 34 is reported.
Your EGR may not be opening during Self-Test.
Your engine must be fully warmed up when performing the KOER Self-Test.
Last edited by vjsimone; Jul 18, 2016 at 09:34 AM. Reason: Adding text
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Don't have a vacuum gauge (yet).
You will need to monitor the vacuum reading at your EGR vacuum connection, during the KOER Self-Test. (Put a vacuum "T" in near the ERG.) Take notes.
During the test the ECA turns on the EGR Solenoid to allow vacuum to flow and open the EGR. The ECA expects to see a drop in RPM due to the exhaust gas mixing with the intake gas. If the EGR does not open, this Idle drop does not happen, so a Code 34 is reported.
Your EGR may not be opening during Self-Test.
During the test the ECA turns on the EGR Solenoid to allow vacuum to flow and open the EGR. The ECA expects to see a drop in RPM due to the exhaust gas mixing with the intake gas. If the EGR does not open, this Idle drop does not happen, so a Code 34 is reported.
Your EGR may not be opening during Self-Test.
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The O2 sensor connector (single wire has a very short wire that runs to a larger, four-pronged connector. That connects to the female connector (also 4 prongs). It seems the connection inside the female connector is faulty. If I hold the voltmeter probe tight inside the female (that sounds like fun) I get a .5 reading. If I loosen it up just the slightest or don't hold it extremely tight, I get a 1. I suspect the female is not making good contact with the male (sound like my marriage sometimes).
Can I pull the single wire and female connector out of the larger connector, or must I replace the whole connector?
Can I pull the single wire and female connector out of the larger connector, or must I replace the whole connector?