My check engine light has been on for a while, I just had it checked recently. It has an Evap code, something about a major vacuum leak in the system.
Lately my car hasn't been shifting too well, it has somewhat harsh shifts at any acceleration rate, but no transmission codes. It shifts rough from 1-2, 2-3, but not 3-4(OD).
I've been told a few things, wondering which one is correct.
1.) The Pressure Control Solenoid in the transmission has gone bad. (Wouldn't that trigger a code?)
2.) If you fix the P0440 code (which I'm inclined to do anyway) the transmission will shift better due to proper power from the engine.
3.) The Throttle Position Sensor is slightly malfunctioning, causing the transmission to think there's more power input and shifting rough.
Also, there's a soft but sharp tapping coming from the engine during idle and moderate acceleration. Should I be worried?
have the same problem?
Tuesday, October 6th, 2009 AT 5:04 PM