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Codes P0302, P0305, P0171, P1000

Tiny
DAN2002
  • MEMBER
  • 1997 FORD EXPLORER
  • 4.0L
  • 6 CYL
  • 170,000 MILES
Have a miss. Codes are p0302, p0305, p0171, p1000 in that order. Changed plugs and wires clean the mass air flow, no change.
Monday, July 25th, 2016 AT 4:20 PM

7 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So is the miss only at idle and while driving down the road you cannot feel it?
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Monday, July 25th, 2016 AT 5:54 PM
Tiny
DAN2002
  • MEMBER
  • 9 POSTS
Both.
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Monday, July 25th, 2016 AT 6:33 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Is it a constant miss like those two cylinders are not firing? Or does the miss come and go?
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Monday, July 25th, 2016 AT 6:53 PM
Tiny
DAN2002
  • MEMBER
  • 9 POSTS
The miss is mainly at idle, but you can feel it a like when driving.
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Tuesday, July 26th, 2016 AT 2:02 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

the first thing I would do is verify fuel pressure. With the lean code. I would make sure the fuel pump is pumping the correct pressure. You can rent a tester at a parts store to check.

Roy
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Tuesday, July 26th, 2016 AT 3:17 PM
Tiny
DAN2002
  • MEMBER
  • 9 POSTS
Checked the fuel pressure and it is getting the correct amount of pressure. It is getting 40 psi running with switch on 29 psi.
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Tuesday, July 26th, 2016 AT 5:46 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I would be looking for a vacuum leak with the p0171. It is more then likely a vacuum leak.
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Tuesday, July 26th, 2016 AT 8:18 PM

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