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What could be causing the hestation and misfire I'm feeling?

Tiny
BRIANNA99
  • MEMBER
  • 1999 FORD CROWN VICTORIA
I have a 1999 Crown VIc PI. It has a hestation and miss-fire feel. I have replaced EGR valve, all spark plugs and coils, air fiter, o2 sensors, and have had the air pressure check for the pump. It is driving me insane! Please, what else could it be?
Friday, July 13th, 2012 AT 5:07 PM

6 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure and scan for codes first
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Friday, July 13th, 2012 AT 5:09 PM
Tiny
BRIANNA99
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  • 4 POSTS
Brought this car from a police acution. In March this year. I also had a new transmission placed as well.
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Friday, July 13th, 2012 AT 5:09 PM
Tiny
BRIANNA99
  • MEMBER
  • 4 POSTS
I have checked the pressure. It came out fine. Also check engine light does not come on.
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Friday, July 13th, 2012 AT 5:10 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
What is fine on fuel pressure?If it's not 35-45 psi with key off engine off then it's not fine. Otherwise check the cam and cranks sensors for resistance they may be high and causing the problem. Check the connections as well that they are making good contact. If it still misfires then check compression must only be a 20% variance between all cylinders.
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Friday, July 13th, 2012 AT 5:14 PM
Tiny
BRIANNA99
  • MEMBER
  • 4 POSTS
It was 45 PSI.
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Friday, July 13th, 2012 AT 5:17 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try cleaning throttle plate on both sides with choke cleaner swell and check for vac leak
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Friday, July 13th, 2012 AT 5:33 PM

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