P0402 Code-I cant figure it out

2002 FORD CROWN VICTORIA
117,000 MILES • V8 • 2WD • AUTOMATIC
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GREASEMONKEY74
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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?
Dec 12, 2010 at 11:38 PM
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WAY2OLD
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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.
Dec 14, 2010 at 12:19 AM
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GREASEMONKEY74
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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.
Dec 14, 2010 at 8:38 PM
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