• In the 1980s and 1990s we used AOL and Usenet. In the 2000s there were forums and message boards. In the 2010s - and until the very near future - social media. Something new is coming for Lincoln owners... Become an early adopter of what's next by SIGNING UP HERE. Your email address will not be sold or used in any way other than us communicating more details as we prepare for launch - and we will not communicate often.

Engine misfire (rough idle, power loss) and system too lean codes. Tried new coils and plugs, no apparent vac leak. PLEASE HELP

Welcome to the busiest full-spectrum Lincoln community online!

Please join us! We'd really love to have you as a member...

Yorkkidinda831

New member
Jun 20, 2022
1
0
1
My Lincoln
2003 Navigator
For months I’ve had random misfire problems and engine too lean codes. I changed coils and plugs and it was better for a day before engine light came back on. Rough idle, low power, mpg loss, light will flash when trying to accelerate at higher speeds. Changed PCV valve and hoses after mechanic found small vac leak. STILL same symptoms persist. Mechanic supposedly checked MAF sensor and other easily accessible potential suspects. Idk what to do. Is it wiring to coils? Fuel injectors? Fuel filter? 2 mechanics so far have tried and failed to find solution.

2003 Navigator 2WD 160,000m 5.4L
 

Action

Junior Member
Aug 12, 2005
928
458
63
Phoenix, AZ 85008-1418
Check for vacuum leaks

If it has over 100,000 miles replace all of the O2 sensors

Action
 
Top