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  #1  
Old 11-30-2008, 09:44 PM
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EGR question....

I removed my EGR tonight, blocked off the port on the rear, pass. side of the manifold. I then blocked off the port on the exhaust manifold. My question is this, are the two 1/8" hoses that run off the top unit of the EGR the hoses that run up to the throttle body? If that is the case then I will just be tieing those two openings togethr with a single piece of 1/8" hose....
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  #2  
Old 12-01-2008, 03:27 PM
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Re: EGR question....

Quote:
Originally Posted by sicksubie View Post
I removed my EGR tonight, blocked off the port on the rear, pass. side of the manifold. I then blocked off the port on the exhaust manifold. My question is this, are the two 1/8" hoses that run off the top unit of the EGR the hoses that run up to the throttle body? If that is the case then I will just be tieing those two openings togethr with a single piece of 1/8" hose....
No don't join them together Bobby, just plug them both. You will probably get a code from the EGR temp sensor, at the back corner of the Inlet.
You may be able to replace the sensor with a resistor that will signal that is is working. I don't have that sensor on my model, so I can't say what the 'hot' resistance is.

Harvey.
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  #3  
Old 12-01-2008, 04:49 PM
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Re: EGR question....

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Originally Posted by oab_au View Post
No don't join them together Bobby, just plug them both. You will probably get a code from the EGR temp sensor, at the back corner of the Inlet.
You may be able to replace the sensor with a resistor that will signal that is is working. I don't have that sensor on my model, so I can't say what the 'hot' resistance is.

Harvey.
Where is the EGR temp sensor located or better yet a pic?
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  #4  
Old 12-01-2008, 07:10 PM
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Re: EGR question....

The 1992 US models did not have temp sensors either, unless they were fitted to meet California standards.

This does not mean that it will not throw a code for a fault in the EGR system. Somehow or another, the ECU can still throw a code (EGR stuck open or closed) even if the ECU wasn't programmed for a temp sensor.

Regardless of that, Bobby, you can cap or join the two fittings on the throttle body to keep them from leaking.

Tom
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  #5  
Old 12-01-2008, 09:03 PM
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Re: EGR question....

Tom - I'm still throwing the code 56, came up about 10 miles after you left.

Can it be something besides the EGR, or do you think despite your heroic efforts to clean it, a new one is in order? Or sounds like maybe I can ditch it too, but would that mess me up for possible future emissions passing?

Would love to finally have no check engine light!
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  #6  
Old 12-01-2008, 10:55 PM
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Re: EGR question....

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Originally Posted by MacGyver View Post
Tom - I'm still throwing the code 56, came up about 10 miles after you left.

Can it be something besides the EGR, or do you think despite your heroic efforts to clean it, a new one is in order? Or sounds like maybe I can ditch it too, but would that mess me up for possible future emissions passing?

Would love to finally have no check engine light!
Troy, you need to have it cleaned out even further I would think. The passages in the intake manifold and exhaust manifolds are probably backed up in the same manner... If I were you, I would get a 92 ECU that was not from a CA car... I can prob dig one up and send it out with the charcoal canister. Shoot me a PM with your addy again and I will pack it up tomorrow

Tom
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  #7  
Old 12-02-2008, 05:38 PM
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Re: EGR question....

The Californians got a harder set-up. The rest just got a code 34 for EGR solenoid inoperative. You got that 34 one, a code 55 for the EGR temp sensor, and a code 56 for stuck open/closed EGR.

The 56 is interesting as to how it detects this problem. My guess is that it probably looks for a drop in the MAF reading to account for the unmetered air, at the same throttle position and same rpms.

Harvey.
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  #8  
Old 12-02-2008, 06:34 PM
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Re: EGR question....

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Originally Posted by oab_au View Post
The Californians got a harder set-up. The rest just got a code 34 for EGR solenoid inoperative. You got that 34 one, a code 55 for the EGR temp sensor, and a code 56 for stuck open/closed EGR.

The 56 is interesting as to how it detects this problem. My guess is that it probably looks for a drop in the MAF reading to account for the unmetered air, at the same throttle position and same rpms.

Harvey.
That would be my guess as well. The drop is likely programmed into the mapping for when the valve opens and when that external air supply isn't there the 02's pick up on a rich mixture and make the assumption.

Tom
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  #9  
Old 12-02-2008, 07:02 PM
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Re: EGR question....

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Originally Posted by TomsSVX View Post
That would be my guess as well. The drop is likely programmed into the mapping for when the valve opens and when that external air supply isn't there the 02's pick up on a rich mixture and make the assumption.

Tom
Yeh I though about that too, but I don't think the O2 sensors will see a difference. It is an inert (burnt ) gas that is introduced, so the F/A ratio would stay the same.

Harvey.
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  #10  
Old 12-02-2008, 08:30 PM
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Re: EGR question....

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Originally Posted by oab_au View Post
Yeh I though about that too, but I don't think the O2 sensors will see a difference. It is an inert (burnt ) gas that is introduced, so the F/A ratio would stay the same.

Harvey.
hmmm.. Maybe it comes down the the exhaust gas temps... but that is doubtful... I would be surprised if the MAF would be able to pick up that slight a change??

Tom
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  #11  
Old 12-02-2008, 10:07 PM
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Re: EGR question....

boy i'm glad this thread came up i just broke the egr valve on my motor pulling it out.
good timing
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  #12  
Old 12-05-2008, 07:36 AM
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Re: EGR question....

why would you do that what do you gain
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