2002 Chevy Impala EVAP Code P0440

Tiny
SNOIMP
  • MEMBER
  • 2002 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 109,015 MILES
Hi,

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?
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Tuesday, October 6th, 2009 AT 5:04 PM

1 Reply

Tiny
RHALL77
  • MEMBER
The p0440 is most likely caused by either the gas cap or the vent valve. This would have nothing to do witht the transmission. But the transmission does sound like a bad pressure valve causing the hard shift. Take it to a trans expert. Most likely the trans will have to be removed to repair it
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Tuesday, October 6th, 2009 AT 6:40 PM

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