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Old 02-06-2015, 11:36 PM   #1
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Help CEL codes

Car threw a CEL so dumped the codes this is what I got..
I recently installed a FPR

KOEO
33, 41, 91
KOER
21,94,44,33


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Old 02-07-2015, 09:37 AM   #2
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https://actron.com/code-lookup


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Old 02-07-2015, 09:41 AM   #3
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Did you let you car get up to operating temp?


That could be the problem right there.


Try it again with the car up to temp and see what comes up.


Do you have your egr hooked up?
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Old 02-07-2015, 09:41 AM   #4
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Code 33 EGR valve opening not detected
Before you replace the EGR valve, check the vac line running from the EGR valve to the EVR solenoid. It may be cracked or even clogged. The EVR solenoid is on backside of the passenger’s side strut tower. If the line is ok, connect a hand held vac pump to the EGR valve and apply 2-3 inches of vacuum. If the EGR valve does not hold vacuum, replace it. If it does hold vacuum, replace the EVR solenoid.

Code 33 - Insufficient EGR flow detected.
Look for vacuum leaks, cracked vacuum lines, failed EGR vacuum regulator. Check to see if you have 10” of vacuum at the EGR vacuum connection coming from the intake manifold. Look for electrical signal at the vacuum regulator solenoid valves located on the rear of the passenger side wheel well. Using a test light across the electrical connector, it should flicker as the electrical signal changes. Remember that the computer does not source any power, but provides the ground necessary to complete the circuit. That means one side of the circuit will always be hot, and the other side will go to ground or below 1 volt as the computer switches on that circuit.
Check for resistance between the brown/lt green wire on the EGR sensor and pin 27 on the computer: you should have less than 1.5 ohm.
Code 33 means the EVP sensor output voltage did not change when ECM expected EVP to register valve opening via an EVP signal voltage increase. Check connection and condition of vacuum line from EGR Valve Regulator (EVR) to EGR valve, repair/replace if necessary.



Code 41,91 description due to clogged Thermactor air crossover tube

Code 41 is a RH side sensor, as viewed from the driver's seat.
Code 91 is the LH side sensor, as viewed from the driver's seat.


Code 21: ECT input out of self-test range of .3vdc - 3.5vdc

Code 44 - Secondary Air System Inoperative. bank one, passenger side
Code 94 -Secondary Air Injection Inoperative. bank two, driver side

The computer uses the change in the O2 sensor readings to detect operation of the Thermactor control valves. When the dump valve opens, it reduces the O2 readings in the exhaust system. Then it closes the dump valve and the O2 readings increase. By toggling the dump valve (TAB), the computer tests for the 44/94 codes.

Failure mode is usually due to a clogged air crossover tube, where one or both sides of the tube clog with carbon. The air crossover tube mounts on the back of the cylinder heads and supplies air to each of the Thermactor air passages cast into the cylinder heads. When the heads do not get the proper air delivery, they set codes 44 & 94, depending on which passage is clogged. It is possible to get both 44 & 94, which would suggest that the air pump or control valves are not working correctly, or the crossover tube is full of carbon or missing.
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Old 02-07-2015, 11:44 AM   #5
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Help CEL codes

Quote:
Originally Posted by smurf stang View Post
Did you let you car get up to operating temp?


That could be the problem right there.


Try it again with the car up to temp and see what comes up.


Do you have your egr hooked up?

Car threw a code when I drove it for like 15-20min, I let it sit for like a he or 2 cause I started cleaning the yard then I dumped the codes
Egr is hooked up
Also smog pump is deleted

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Old 02-07-2015, 11:52 AM   #6
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Quote:
Originally Posted by ALMOST STOCK View Post
Code 33 EGR valve opening not detected
Before you replace the EGR valve, check the vac line running from the EGR valve to the EVR solenoid. It may be cracked or even clogged. The EVR solenoid is on backside of the passenger’s side strut tower. If the line is ok, connect a hand held vac pump to the EGR valve and apply 2-3 inches of vacuum. If the EGR valve does not hold vacuum, replace it. If it does hold vacuum, replace the EVR solenoid.

Code 33 - Insufficient EGR flow detected.
Look for vacuum leaks, cracked vacuum lines, failed EGR vacuum regulator. Check to see if you have 10” of vacuum at the EGR vacuum connection coming from the intake manifold. Look for electrical signal at the vacuum regulator solenoid valves located on the rear of the passenger side wheel well. Using a test light across the electrical connector, it should flicker as the electrical signal changes. Remember that the computer does not source any power, but provides the ground necessary to complete the circuit. That means one side of the circuit will always be hot, and the other side will go to ground or below 1 volt as the computer switches on that circuit.
Check for resistance between the brown/lt green wire on the EGR sensor and pin 27 on the computer: you should have less than 1.5 ohm.
Code 33 means the EVP sensor output voltage did not change when ECM expected EVP to register valve opening via an EVP signal voltage increase. Check connection and condition of vacuum line from EGR Valve Regulator (EVR) to EGR valve, repair/replace if necessary.



Code 41,91 description due to clogged Thermactor air crossover tube

Code 41 is a RH side sensor, as viewed from the driver's seat.
Code 91 is the LH side sensor, as viewed from the driver's seat.


Code 21: ECT input out of self-test range of .3vdc - 3.5vdc

Code 44 - Secondary Air System Inoperative. bank one, passenger side
Code 94 -Secondary Air Injection Inoperative. bank two, driver side

The computer uses the change in the O2 sensor readings to detect operation of the Thermactor control valves. When the dump valve opens, it reduces the O2 readings in the exhaust system. Then it closes the dump valve and the O2 readings increase. By toggling the dump valve (TAB), the computer tests for the 44/94 codes.

Failure mode is usually due to a clogged air crossover tube, where one or both sides of the tube clog with carbon. The air crossover tube mounts on the back of the cylinder heads and supplies air to each of the Thermactor air passages cast into the cylinder heads. When the heads do not get the proper air delivery, they set codes 44 & 94, depending on which passage is clogged. It is possible to get both 44 & 94, which would suggest that the air pump or control valves are not working correctly, or the crossover tube is full of carbon or missing.

How can I clean out the crossover tubes.?
So it has nothing to do with the O2 sensors


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Old 02-07-2015, 01:09 PM   #7
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Quote:
Originally Posted by Vazqueza90 View Post
How can I clean out the crossover tubes.?
So it has nothing to do with the O2 sensors


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I used a old metal coat hanger or possibly something like this
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Old 02-07-2015, 01:19 PM   #8
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Quote:
Originally Posted by ALMOST STOCK View Post
I used a old metal coat hanger or possibly something like this

Do you have a pic of how they look/location


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Old 02-07-2015, 02:24 PM   #9
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Quote:
Originally Posted by Vazqueza90 View Post
Do you have a pic of how they look/location
Are you asking for the location of the crossover tube?
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Old 02-07-2015, 03:30 PM   #10
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Quote:
Originally Posted by ALMOST STOCK View Post
Are you asking for the location of the crossover tube?
yes and how do they look I'm a noob


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Old 02-08-2015, 08:36 AM   #11
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The air cross over tube/pipe is just one piece of tubing that runs from one head to the other head and then exits to a check valve. The cross over tube is held in place by 2 bolts on the backside of the head.
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Old 02-08-2015, 11:44 AM   #12
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Help CEL codes

Quote:
Originally Posted by ALMOST STOCK View Post
The air cross over tube/pipe is just one piece of tubing that runs from one head to the other head and then exits to a check valve. The cross over tube is held in place by 2 bolts on the backside of the head.

Thanks man
Is it hard to remove and reassemble.?


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Old 02-08-2015, 11:57 AM   #13
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Remove the 2 bolts and disconnect the hose from the check valve and then pull it out from the passenger side of the engine bay, installing it is the reverse.
I'm not gonna lie it's a PITA because of the tight space between the head and the firewall but it's definitely do able.
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