Help with P2177 Code
My wife's 2007 Mazda3 started running poorly and showing a P2177 and P2187 code. The car runs great while it is cold, but after it warms up, you can feel a slight miss under light acceleration, ie when the cruise is on going up a moderate hill. If the car is turned off warm for at least 5 minutes, the CEL comes on the first time the car accelerates. The usual code is P2177.
After reading up on the fault, I replaced the MAFS, the fuel ratio sensor, and the purge valve. None of this helped.
Tonight, I took the car out and tested the new components with my laptop hooked up to it. When the car was missing, the voltage to the air/fuel sensor was going crazy. When the car was running smooth, the readings stayed smooth.
Any ideas? Can a bad ECT do this? It is odd that the car runs flawlessly until it warms up. Help!