EGR Valve Melting = bad O2 sensor??

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  #1  
Old 02-24-09, 06:26 PM
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EGR Valve Melting = bad O2 sensor??

EGR Valve is melting on a 1989 Olds Delta 88 with a 3.8 liter V-6. I've had a loss of power and not so good of gas mileage also.

Could a bad 02 sensor cause this?

Can I block off the EGR?
 
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Old 02-24-09, 07:10 PM
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Is this the diaphragm melting or the plunger that lets the exhaust through the EGR?
 
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Old 02-24-09, 07:10 PM
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Unfortunately, you have all the tell tales of a Clogged Catalytic converter.

The Hot exhaust gas cant exit, and backs up into the exhaust manifolds, And melts the aluminum EGR valve.

Try this...... Remove the O2 sensor, carefully tie the wiring out of the way, and spin the car around the block......(Yes it will make an incredible racket) If the power is restored, suspect the exhaust is restricted. Removing the sensor just makes a hole for the trapped exhaust gas to escape.
 
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Old 02-25-09, 09:37 AM
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Originally Posted by marbobj View Post
Is this the diaphragm melting or the plunger that lets the exhaust through the EGR?
It's an electronic EGR with 3 pistons and 3 black (some kind of plastic) rectangular boxes on top...and this black plastic is melting near the bottom of each one...and the wires coming to it were also melted but I fixed those.
 
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Old 02-25-09, 01:07 PM
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think unclediezel probably already told you your problem and would suggest you see an exhuast shop for a back pressure test.
 
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Old 02-25-09, 03:56 PM
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The cat was replaced a couple of years ago and I took the oxygen sensor out and it didn't make a difference in the way the car ran.

Something may be going on with the cam sensor magnet.
 
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