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How do I know if my EGR valve is defective? My service engine soon lights is coming on intermittently and Auto Zone states that the code is p1401 which is a Exhaust Gas Recirculating Valve sensor. My 1996 Grand Prix is running fine; However, the engine light comes on every other week or so but the light doesn't stay on. Thanks! Ron Hill

Submitted: 1166 days and 3 hours ago.

Category: Car

Value: $8

Status: AWAITING CUSTOMER ACTION

Optional Information:
1996 Pontiac Grand Prix 3.1L

Already Tried:
I took vehicle to Auto Zone for them to give me the code per the Service Engine Soon Light.

Answer

take a vacuum pump and apply vacuum to the valve with it running, it should stumble or stall out if it is working properly. if not the valve may be bad or the passage may be clogged with carbon.Removal and inspection of the valve would be necessary if this is the case.Otherwise more diagnostics of the electronic end of the circuit that controls egr operation would be needed.

Accepts:
Expert:	Gene
Pos. Feedback:	99.3 %
Answered:	9/13/2006

Auto Service Technician

ASE Master 19 years experience, Ford Trans Tech/SMT, Toyota, Mitsubishi,Hyundai Tech.

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Optional Information: 1996 Pontiac Grand Prix 3.1LAlready Tried: I took vehicle to Auto Zone for them to give me the code per the Service Engine Soon Light.

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Optional Information:
1996 Pontiac Grand Prix 3.1L

Already Tried:
I took vehicle to Auto Zone for them to give me the code per the Service Engine Soon Light.