2005 Ford Taurus HELP P0174 and P0300 - Taurus Car Club of America : Ford Taurus Forum
LinkBack Thread Tools
post #1 of 4 (permalink) Old 01-06-2019, 04:57 PM Thread Starter
Junior Member
Join Date: Jan 2019
Posts: 1
Rep Power: 0
Trader Score: 0 reviews
2005 Ford Taurus HELP P0174 and P0300

I own a 2005 Ford Taurus with just under 70,000 miles on the 3.0 OHV V6 and Have been trying to diagnose two codes i am getting for 6 months now and will take all the help i can get . The two codes are P0174 (System too lean Bank 2) and P0300 Random/Multiple Cylinder misfire Detected.
So far i have done the following
1. Replaced all of the spark plugs and tested the wires.
2. Replaced the coil pack
3. Replaced all of the O2 sensors
4. Replaced the fuel filter
5. Filled up tank full and added a water remover to purge any water in the fuel lines

The car does start and drive and im getting about 20 to 25 MPG
it is usually run when the outside temperature is under 40 F
notice a very very rough idle when starting up
When at freeway speeds i do not notice much variance in the RPM,however i can feel a slight misfire or irregularity in the engine when i am accelerating from about 50-60 mph
the RPM at idle when the engine is warmed up is around 500-600

Any help what so ever is much much apprecated

Also this is my first post , let me know if there is any additional info that i can provide .
Blaine Levine is offline  
Sponsored Links
post #2 of 4 (permalink) Old 01-06-2019, 05:11 PM
Crazy Devoted Member
Join Date: Dec 2006
Chapter: Midwest
Year: 1998
Model: Mercury Sable
Engine: 3.0L 24v Duratec V6
Posts: 22,391
Rep Power: 112
Trader Score: 1 reviews
Welcome Blaine! You most likely have an undetected vacuum leak(s). Short/long term fuel trim readings would be helpful in diagnosing if you have access to a scan tool.
sheila is offline  
post #3 of 4 (permalink) Old 01-06-2019, 05:44 PM
Crazy Devoted Member
Join Date: Jan 2010
Location: North Canton, Ohio
Chapter: Midwest
Year: 2006
Model: Ford Taurus
Engine: 3.0L 12v Vulcan V6
Posts: 6,536
Rep Power: 65
Trader Score: 0 reviews
Welcome! Driving with a misfire any extended period have been know to destroy catalytic convertors.
Automender12345 is offline  
post #4 of 4 (permalink) Old 01-06-2019, 10:59 PM
Senior Member
TollKeeper's Avatar
Join Date: Aug 2018
Location: Denver, Colorado
Chapter: Pacific Northwest
Year: 2005
Model: Mercury Montego
Engine: 3.0L 24v Duratec V6
Posts: 716
Rep Power: 4
Trader Score: 0 reviews
I agree with @Automender12345 , I would also like to suggest that you post your problem in the forum dedicated to your car. Althou the intro forums do get some traffic, its not nearly as much as the main forums.

Welcome to TCCA.

Brian - Carpe Diem

2005 Mercury Montego 52k
2004 GMC Envoy XUV 182k
2001 Pontiac Aztek GT AWD 120K
TollKeeper is offline  
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Taurus Car Club of America : Ford Taurus Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel problems with 2004 Ford Taurus. richie33 Maintenance and Repair 3 06-06-2017 11:23 PM
p0171, p0174 & p0300 irritation kangbroke Maintenance and Repair 43 12-22-2016 01:25 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome