2003 Chevy Impala Code P0401

Tiny
USER75
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 115,000 MILES
My check engine light came on on my 2003 impala about 3-4 months ago. We had it scanned and code P0401 came up. We changed the egr valve and reset the check engine light. We drove it straight to the gas station which is less than a mile away and filled it up with gas. On the way back home, the check engine light came back on. Sometimes the car is hard to start. I have to try 2 to 3 times before it will start. Any Suggestions?
Wednesday, May 26th, 2010 AT 8:00 AM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
Did you check codes after it came back on the second time?

Insuffecient EGR flow should not cause starting problems, EGR only flows at certain speed and under certain conditions (above 30mph, engine in closed loop, etc).

If same code appears, I would check, fuel pressure with mechanical gauge, spark with spark tester as a starting point.
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Wednesday, May 26th, 2010 AT 8:08 AM

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