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P0402 Code-I cant figure it out

Tiny
GREASEMONKEY74
  • MEMBER
  • 2002 FORD CROWN VICTORIA
  • V8
  • 2WD
  • AUTOMATIC
  • 117,000 MILES
2002 ford crown victoria PI. Code P0402. Have replaced EGR valve, DPFE and EVP. Checked DPFE hoses and blew a bit of air through the lines to make sure they were clear. Checked vacuum lines in EGR system. Cleaned MAF sensor and checked idle in gear voltage at MAF - about.90v. Drivability issues are most prevalent when the car is at operating temperature. Car bucks and stutters while accelerating or cruising at a low rpm. What do you think?
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Sunday, December 12th, 2010 AT 11:38 PM

2 Replies

Tiny
WAY2OLD
  • MECHANIC
  • 195 POSTS
Are you sure the COP's are in good shape along with spark plugs? We run into a lot of engine misses under light acceleration and not set a code for misfire.
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Tuesday, December 14th, 2010 AT 12:19 AM
Tiny
GREASEMONKEY74
  • MEMBER
  • 2 POSTS
I ended up taking the car into a local shop and it was a faulty NEW dpfe causing my problems. That's the 2nd new dpfe since I've owned the car that has been bad out of the box. Motorcraft only from now on.
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Tuesday, December 14th, 2010 AT 8:38 PM

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