5.4l will not rev over 3k rpm

60

Asked by Mar 28, 2016 at 04:06 PM about the 2005 Lincoln Navigator Luxury

Question type: Maintenance & Repair

Throwing code p0191 for fuel pressure sensor.
Runs great till 2,500-3k rpm then spit, sputter.
Down shift for more rpm and it acts like a engine
break till about 3k the spit, sputter. Anyone else
have this problem?

8 Answers

74,645

I was thinking possible plugged catalytic converter, may want to have that checked anyway, but the code also indicates that there may be a problem with the fuel pump. Should have the fuel pressure checked. P0191 - Fuel Rail Pressure Sensor Circuit Range/Performance... Possible causes... - High fuel pressure - Low fuel pressure - Damaged FRP sensor - Excessive resistance in the circuit - Low or no fuel - Wiring harness connector of the fuel pressure sensor - Fuel Rail Pressure Sensor - Vacuum leaks - Fuel

60

Tried disconnecting the harness on the f.p.s. and there was no change on how it ran. Went to the store 10 miles out. Came back out started right up then it started running rough and missing all around now. Hopefully get a fuel pressure gage in the morning but it sounds like there is no easy way to connect to the fuel rail..

74,645

If there is no Schrader valve to hook on to with the fuel pressure gauge, (looks like a valve stem in a wheel) you are going to need the necessary fittings to tap into the fuel line. If your are going to rent one, ask in what is required for fittings.

60

Well there isn't a valve on it for the gauge but used a scan tool and found the fuel pressure was good. Pressure is good till the 2,500 3,000 rpm mark then it drops off, more I push the Gass the more it will drop down to 8psi.

74,645

So that could do it. Fuel pressure should maintain within range. Sounds like a weak fuel pump.

Best Answer Mark helpful
60

Going to try the fuel filter first and hope for a cheap easy fix....

60

It worked for a little while but problem came back.

74,645

Weak fuel pump.

Your Answer

Navigator

Looking for a Used Navigator in your area?

CarGurus has 4,203 nationwide Navigator listings starting at $1,900.

ZIP:

Lincoln Navigator Experts

  • #1
    jimmyarango
    Reputation
    1,570
  • #2
    T_S_T
    Reputation
    430
  • #3
    dandyoun
    Reputation
    330
View All

Related Models For Sale

Used Ford Expedition
345 Great Deals out of 18,245 listings starting at $1,989
Used Cadillac Escalade
247 Great Deals out of 12,007 listings starting at $2,500
Used Chevrolet Tahoe
718 Great Deals out of 41,409 listings starting at $1,995
Used GMC Yukon
460 Great Deals out of 22,338 listings starting at $1,995
Used Chevrolet Suburban
381 Great Deals out of 22,779 listings starting at $1,999
Used Cadillac Escalade ESV
108 Great Deals out of 5,583 listings starting at $4,900
Used GMC Yukon XL
219 Great Deals out of 14,343 listings starting at $1,900
Used Ford Explorer
915 Great Deals out of 67,921 listings starting at $1,495
Used Ford F-150
2,559 Great Deals out of 195,338 listings starting at $1,300
Used Nissan Armada
146 Great Deals out of 8,360 listings starting at $1,995
Used INFINITI QX56
53 Great Deals out of 1,484 listings starting at $4,900
Used Lincoln Aviator
214 listings starting at $2,500
Used Dodge Durango
262 Great Deals out of 22,528 listings starting at $895

Used Cars For Sale

2018 Lincoln Navigator For Sale
22 listings starting at $78,616
2017 Lincoln Navigator For Sale
7 Great Deals out of 1,815 listings starting at $42,499
2016 Lincoln Navigator For Sale
4 Great Deals out of 321 listings starting at $36,792
2015 Lincoln Navigator For Sale
6 Great Deals out of 232 listings starting at $24,300
2014 Lincoln Navigator For Sale
5 Great Deals out of 200 listings starting at $19,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.