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1997 Ford Explorer 4 litre SOHC V6

Tiny
MIKBUR
  • MEMBER
  • 1997 FORD EXPLORER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 66,000 MILES
At startup the engine races then immediatly almost stalls. It then varies in RPM from 500 to 2000. Other than that it runs perfect. Check engine light on- codes 171 and 174 indicating MAF sensor or exhaust oxygen sensors- replaced all three and problem persists after some time. Parts guy reset computer after each part replaced. What to I check next? Thank you for your help, Mike
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Tuesday, April 7th, 2009 AT 7:27 PM

2 Replies

Tiny
JGAROFALO
  • MECHANIC
  • 489 POSTS
Xxx
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Wednesday, April 8th, 2009 AT 10:11 AM
Tiny
JGAROFALO
  • MECHANIC
  • 489 POSTS
Look for air leaks in the intake path. Leaking vacuum hoses and air ducts are the primary suspects. If no problem is found with air leaks, then the intake manifold gasket and upper intake are suspect. That engine has a plastic upper intake, and they have been known to crack.
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Wednesday, April 8th, 2009 AT 10:12 AM

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