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Troubleshooting stalling engine, codes P0440 and P0442

Tiny
CDANIEL95123
  • MEMBER
  • 2000 PONTIAC GRAND AM
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 134,000 MILES
The car starts up fine will idle fine, but when I go to drive it starts cutting out and stalling. Got two error codes p0440 and p0442. Has new gas cap and fuel filter also just changed. What else should I look for?
Thursday, March 21st, 2019 AT 5:56 PM

1 Reply

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

These Direct Trouble Code (DTC)s are for a big and a small leak from your vehicle's Evaporitive (EVAP) emission system. The first DTC P0440 is actually large enough of a leak to be classified as a vacuum leak. It is this one, really both are not good, but the first one that is responsible for your vehicle's drivability concern.
I have included factory troubleshooting flowcharts for both DTC's, but as you go through the first one, you will probably find both leaks. Go through these flowcharts and get back to us with what you find out.
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Thursday, March 21st, 2019 AT 9:55 PM

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