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Erratic engine speed during shift

Tiny
TMKALI
  • MEMBER
  • 1999 FORD WINDSTAR
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 34,000 MILES
I have a 99 Windstar with 34,000 miles on it.
When you accelerate the tach goes up and down like it can't decide witch gear to choose. It runs great down the highway and around town. After you shut it down and come back to restart it, it idles rough for a few seconds but then smooths out. I have replaced the Fuel filer, Throttle position sensor, MAF, EGR, DPFE, and IAC. This is "undred Dllaring"me to death. Any ideas?

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Thursday, February 24th, 2011 AT 5:37 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Get th engine scanned to see if there are any codes instead of replacing parts. Check your fuel pressure and then check for a vacuum leak
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Thursday, February 24th, 2011 AT 11:47 PM
Tiny
TMKALI
  • MEMBER
  • 3 POSTS
I had it scanned first. It said EGR pressure to high, EGR pressure to low, Bank 1 too lean, Bank 2 too lean.
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Friday, February 25th, 2011 AT 12:17 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Then try cleaning the pintle valve on the egr and see if the passages are plugged up. If not that then have it checked the egr may be inoperative. Also run choke cleaner around the intake where there are gaskets and look for vacuum leaks or bad hoses.
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Friday, February 25th, 2011 AT 2:19 AM

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