My engine light comes on and the code (31 if I remember correctly) tells me
the egr valve is out of range(low).
So I spend $50 and replace the Egr valve and disconnect the battery to reset
the codes and the same code comes on.
Is there an EGR sensor and where is it located? Thanks
Anything else it might be? Emissions is coming up in September so I should
get this taken care of.
IIRC, your 90 has an EVP (EGR valve Position) sensor on top of the EGR valve.
tells the engine computer how far the valve is open. For $50, the new valve
come with one. That is likely your problem, it's a pretty high failure item.
means that the feedback voltage to the ECM from the EVP sensor is lower than it
expects to see when the valve is open.(More EGR opening, more feedback voltage.
is also a vacuum solenoid that controls vacuum to the EGR valve. It's at the
of the vacuum line to the valve. If it has failed, there will be no EGR
low feedback voltage. They don't often fail, but they can.
If you have a test light, check for voltage to the EGR (EGR Valve Regulator,
solenoid with the engine running. Then put the light on the other terminal. This
usually cause the EVR to apply some vacuum to the EGR valve. At idle, the
start to miss and shake slightly. This tells you the EVR is probably ok.
Hope this helps, Tom
A common problem of that year is:....The sensor is very close to in
range/out of range. If the valve is working, take the sensor off of the
valve (3 screws) and grind about an 1/8 inch off of the end of the sensor
stem. ( the round, thin metal piece sticking out of the bottom of the
sensor). Re-install and do the self tests again.
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