2004 Lincoln LS Hard start

Tiny
HEY-BLINKIN
  • MEMBER
  • 2004 LINCOLN LS
  • 3.9L
  • V8
  • RWD
  • AUTOMATIC
  • 190,000 MILES
When cold cranking, and it only happens when it is cold out, it cranks runs for 1 maybe 2 seconds and must be done again. Eventually it runs and when it finally does there is no problem. It is just as fast as always. Did a fuel pressure test and with the ignition to ON, you can hear the pump engage and the pressure goes to 35 but when the pump stops the pressure drops to zero immediately. I have been told pump is bad, check valve is bad, so I changed them, both. Fuel pump and jet pump entire assemblies. Once done it did the same thing. So I did a pressure check and still with the key turned to on, fuel pressure up to 30-35 and just as fast drop to zero. Just to check it, I sprayed a little starting fluid in the air box and it fired up but quit just as fast. After 44 turns of the key it fired up and ran just like it has been doing. Any ideas?
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Saturday, November 15th, 2014 AT 2:17 PM

10 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Does the pressure still drop off? Is there any black smoke from the exhaust when you get it to run? Did you check or replace the regulator? Are there any trouble codes stored in the computer?
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Saturday, November 15th, 2014 AT 4:51 PM
Tiny
HEY-BLINKIN
  • MEMBER
Pressure still drops just a fast as it rises, no smoke when running, last start up took 30 attempts, and there is no regulator on these cars I am told, I believe there is a pressure sensor and that has not been replaced however while unplugged and running, no matter how long it does not spray fuel which I am told is the result we want
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Saturday, November 15th, 2014 AT 6:36 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
For it to drop pressure that quickly, either the sensor is bad or there has to be a leak at some point. I have to ask a question. Are you certain the fuel lines were properly reconnected when the pump was replaced?
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Monday, November 17th, 2014 AT 5:25 AM
Tiny
HEY-BLINKIN
  • MEMBER
Near as I can tell yes. But it was doing that before the pump was replaced and that was the original. So I know that one was installed properly.
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Monday, November 17th, 2014 AT 7:00 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
There has to be a leak or the sensor is bad.
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Monday, November 17th, 2014 AT 7:29 AM
Tiny
HEY-BLINKIN
  • MEMBER
I will order a sensor and let you know
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Monday, November 17th, 2014 AT 7:30 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Just make sure the one on the vehicle looks the same with the same connections.
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Monday, November 17th, 2014 AT 7:39 AM
Tiny
HEY-BLINKIN
  • MEMBER
Finally got the sensor and cannot get the electrical connector or the hose to turn loose. Got the two bolts out but am afraid to just pull the other two out. Don't want to break them. Is it age or is there a trick?
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Saturday, November 22nd, 2014 AT 5:28 PM
Tiny
HEY-BLINKIN
  • MEMBER
OK, got it installed and it acts the same. Took 20 cranks to get it to remain running, I thought maybe because it is the first time, so waited a couple hours and sure enough, 25 times before continuous running. Now what?
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Sunday, November 23rd, 2014 AT 11:09 AM
Tiny
HEY-BLINKIN
  • MEMBER
Did I miss something, there is a blank answer next to the jacob and nickolas icon
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Sunday, November 23rd, 2014 AT 7:53 PM

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