Bad thermostat, weird idle and MPG - Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace


Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > Ford Focus Tech Discussions > General Technical Chat

General Technical Chat This section is for technical discussions relating to general maintenance, electrical issues, engine trouble, and recalls.

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 12-03-2012, 12:52 PM   #1
bones33
Focus Enthusiast
 
Join Date: Oct 2012
Fan#: 105414
Location: Somewhere on the west coast, WA
What I Drive: '05 Silver ST

Posts: 69
Points 378, Level 7
Points: 378, Level: 7 Points: 378, Level: 7 Points: 378, Level: 7
Level Up 56% Completed
Level up: 56% Level up: 56% Level up: 56%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 1 bones33 Good Standing Member
Buy-Sell-Trade Rating: (1)
Bad thermostat, weird idle and MPG

Just though I'd post this for those interested.

My '05 ST with 2.3 was purchased with a bad thermostat (stuck open). It warmed up according to the gauge in just a couple of miles from cold. It ran well except for an inconsistently high idle, no CEL. The heater put out warm, not really hot air. MPG was ranging from 27-30.

I plugged in the scangauge to get an idea of the temps the PCM was seeing. Turns out that when the gauge reads normal, it doesn't change from 143* to at least 215* which is as hot as it ever got. Often it would run between 150* and 175*. Again, the in-dash gauge always read the same and indicating "normal".

Changed thermostat.

Now it warms up much faster, heater is toasty hot and maintains at least 195* per the specs. Idle is rock solid and consistent. MPGs now are consistently just over 33 in the last 3 tanks.


bones33 is offline  
    Reply With Quote
 

Bookmarks & Social Networks

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS 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:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 01:56 PM.


Copyright 2002-2014 FocusFanatics.com. All Rights Reserved : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Audi S3, Ford Fusion and Acura TLX. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area. Challenger Hellcat - Charger Hellcat