Over the past few weeks, we have been getting on and off P1487 CEL codes. These will clear on their own but later return.
Today, the CEL came on again, and now we have P1487 and P2227 codes.
We don't have any real drivability issues. The only thing we have noticed is a oil smell when we first start the car, and sometimes a puff of dark smoke. Don't know of that is related, or if that is just 176k seals.
I'd appreciate any thougths and guidance you could give on this.
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The puff of smoke (if bluish) at start-up would indicate worn valve stem seals (not unlikely at that mileage.) Not a real problem, but it does add to oil consumption. It would most likely be an unrelated issue to your codes.
I checked the sensor today. It was getting constant feed at 5 volts. Without suction, it was at 1.07V and that increased to 3.7V when suction was applied.
So I moved to the solenoid. I have good suction from the intake, so I disconnected the vacuum line to the sensor, and applied battery voltage to the two terminals on the solenoid. At first, I didn't hear the solenoid click and got no suction on the vacuum hose. After rechecking all my electical connections, and trying a few more times the solenoid opened and I got suction. I did this several times, and the solenoid acted normal and there was suction on the vacuum hose when open.
Could there just have been something blocking the solenoid? Should I replace the solenoid?
It's an old post but I'm getting the same 2 code after replacing the EGR valve, vacuum lines, and cleaning electrical contacts. I also ran some wire into the sensor ports and the one with a Mitsubishi logo and K47 marking did indeed seem a bit plugged up. I was likewise seeing 5V and ~2.5V on other pin with key on and engine off.
Do these fail? Did your clear or did you end up replacing it?