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96 chev corsica service engine soon
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Guest
Anonymous Poster
Sep 3, 2008, 8:03 PM
Post #1 of 4
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96 chev corsica service engine soon
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96 Corsica 218K miles 3.1 liter V6
My check engine light came on an a read of the code at Auto Zone indicated insufficient EGR flow. The counter person who reed the code stated that it could be the EGR valve ($170) or any sensor in that circuit. Is this true? I don't want to do the replace each sensor one by one until I find the bad one as some of my friends have done. I found one at a bone yard ($50) that the counter person told me came from a running motor however when I asked if they could be tested they stated no. So should I just bite the bullet and get the new sensor in hopes that it will fix the problem? Any and all help with this is appreciated.
Thanks
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DanD
Veteran
/ Moderator
Sep 4, 2008, 4:23 AM
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Re: 96 chev corsica service engine soon
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This may not be a sensor or the EGR but a plugged exhaust gas passageway. In other words the valve is opening when requested by the computer; the “sensors” are doing their job by reporting to the computer that the flow is low. But if the passageways are plugged there will not be any or very little exhaust gas flow.
Just food for thought?
If you’re worried about spending good money for bad, by throwing parts at the car; take it in and have it diagnosed.
On car tests with the proper equipment, is relatively easy to diagnose this problem.
Dan.
Canadian "EH"
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Guest
Anonymous Poster
Sep 4, 2008, 7:38 PM
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Re: 96 chev corsica service engine soon
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Dan
Thanks for the thought. I posted this ? on the car talk site as well and you are the second person to respond with the same answer. I plan to check the tube that leads from the exhaust manifold to the sensor. As the other response stated given the miles the tube may be loaded with carbon and restricting the flow and the sensor is not faulty just doing it's job. I plan to check the Haynes manual at the local library to see if they have a procedure for cleaning. Again thanks for the thoughts.
KB
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DanD
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Sep 5, 2008, 4:12 AM
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Re: 96 chev corsica service engine soon
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Of all the EGR passageways that I have found being restricted; it has almost never been the stainless steel tube going to the valve but the passageway, inside the upper manifold that become plugged.
This would mean pulling the upper plenum; removing the throttle plates and then with a wire (coat hanger) and some solvent, go digging.
There are a couple of different EGR systems that might be on this engine but I believe yours is likely the digital style?
The digital has three electric solenoids and a four wire connector that plugs into the center.
If this is your style you can test it relatively easy with a couple of jumper wires.
Unplug the electrical connector of the valve, connect a fused jumper wire to terminal D of the valve; connect the other end of the jumper to battery positive. Terminal D is where the pink wire of the harness would connect to.
A fused jumper wire is a length of wire that has a maximum of a 10 amp (in this case) fuse connected inline. This is just in case you short the wire or there is a short to ground somewhere; the fuse will blow, instead of burning something up.
The other three terminals, in the valve are the grounds for the solenoids.
Take a second jumper wire that is connected to a known good ground and touch one of the three ground terminals of the valve; you should hear a click coming from that solenoid. Try each terminal they all should do the same (click); if not then the valve is bad.
To check for restricted passageways, start the engine and allow it to reach operating temperature.
Then again try grounding the individual solenoids.
Each one of the solenoids has a different size orifice, which opens when the solenoid is energized.
The engine should loose some rpm and may even cause a misfire or stall; depending on which solenoid you’ve just opened.
If regardless of which solenoid you energize the engine runs the same or very little difference, then the passageways are plugged.
All of this will tell you; whether the valve is ok or if there are any restrictions in the passageways but it does not tell you whether the computer has the ability to command the valve (solenoids) on and off. You would need a scan tool with bidirectional abilities.
A scan tool that can ask the computer, to perform certain functions, ie: open EGR 1-2 or 3.
Dan.
Canadian "EH"
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